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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	May 07, 2019
Entity Registrant Name	ONCOR ELECTRIC DELIVERY CO LLC
Entity Central Index Key	0001193311
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		0
Oncor Electric Delivery Holdings Company LLC [Member]
Entity Outstanding Membership Interests		80.25%
Texas Transmission Investment LLC [Member]
Entity Outstanding Membership Interests		19.75%

Condensed Statements Of Consolidated Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Statements Of Consolidated Income [Abstract]
Total operating revenues	$ 1,016	$ 990
Operating expenses:
Wholesale transmission service	260	245
Operation and maintenance (Note 9)	221	219
Depreciation and amortization	172	166
Provision in lieu of income taxes (Note 9)	25	33
Taxes other than amounts related to income taxes	122	125
Total operating expenses	800	788
Operating income	216	202
Other income and (deductions) - net (Note 10)	(17)	(32)
Nonoperating provision (benefit) in lieu of income taxes (Note 5)	(3)	(7)
Interest expense and related charges (Note 10)	86	88
Net income	$ 116	$ 89

Condensed Statements Of Consolidated Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Statements Of Consolidated Comprehensive Income [Abstract]
Net income	$ 116	$ 89
Other comprehensive income (loss):
Net effects of cash flow hedges (net of tax) (Note 1)	(4)
Defined benefit pension plans (net of tax)	1	1
Total other comprehensive income (loss)	(3)	1
Comprehensive income	$ 113	$ 90

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Condensed Statements Of Consolidated Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows - operating activities:
Net income	$ 116	$ 89
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization, including regulatory amortization	192	196
Provision in lieu of deferred income taxes	8	10
Other - net	(2)
Changes in operating assets and liabilities:
Regulatory accounts related to reconcilable tariffs (Note 2)	(20)	30
Other operating assets and liabilities	(108)	10
Cash provided by operating activities	186	335
Cash flows - financing activities:
Change in short-term borrowings (Note 4)	328	125
Capital contributions from members (Note 7)	70
Distributions to members (Note 7)	(71)
Cash provided by financing activities	327	125
Cash flows - investing activities:
Capital expenditures (Note 9)	(523)	(450)
Other - net	12	5
Cash used in investing activities	(511)	(445)
Net change in cash and cash equivalents	2	15
Cash and cash equivalents - beginning balance	3	21
Cash and cash equivalents - ending balance	$ 5	$ 36

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 5	$ 3
Trade accounts receivable - net (Note 10)	592	559
Materials and supplies inventories - at average cost	137	116
Prepayments and other current assets	101	94
Total current assets	835	772
Investments and other property (Note 10)	119	120
Property, plant and equipment - net (Note 10)	16,455	16,090
Goodwill	4,064	4,064
Regulatory assets (Note 2)	1,654	1,691
Operating lease ROU assets and other (Note 6)	100	15
Total assets	23,227	22,752
Current liabilities:
Short-term borrowings (Note 4)	1,141	813
Long-term debt due currently (Note 5)	600	600
Trade accounts payable	321	300
Amounts payable to members related to income taxes (Note 9)	39	26
Accrued taxes other than amounts related to income	78	199
Accrued interest	99	68
Operating lease and other current liabilities (Note 6)	225	209
Total current liabilities	2,503	2,215
Long-term debt, less amounts due currently (Note 5)	5,835	5,835
Liability in lieu of deferred income taxes (Note 9)	1,627	1,602
Regulatory liabilities (Note 3)	2,674	2,697
Employee benefit, operating lease and other obligations (Notes 6, 8 and 10)	2,012	1,943
Total liabilities	14,651	14,292
Commitments and contingencies (Note 6)
Membership interests (Note 7):
Capital account ― number of interests outstanding 2019 and 2018 – 635,000,000	8,743	8,624
Accumulated other comprehensive loss	(167)	(164)
Total membership interests	8,576	8,460
Total liabilities and membership interests	$ 23,227	$ 22,752

Condensed Consolidated Balance Sheets (Parenthetical) - shares	Mar. 31, 2019	Dec. 31, 2018
Condensed Consolidated Balance Sheets [Abstract]
Capital account, interests outstanding	635,000,000	635,000,000

Business and Significant Accounting Policies

3 Months Ended

Mar. 31, 2019

Business and Significant Accounting Policies [Abstract]

BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES

1. BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES

Description of Business

References in this report to “we,” “our,” “us” and “the company” are to Oncor and/or its subsidiaries. See “Glossary” for definition of terms and abbreviations.

We are a regulated electricity transmission and distribution company principally engaged in providing delivery services to REPs that sell power in the north-central, eastern and western parts of Texas. We are a direct, majority-owned subsidiary of Oncor Holdings, which is indirectly wholly owned by Sempra. Oncor Holdings owns 80.25% of our membership interests and Texas Transmission owns 19.75% of our membership interests. We are managed as an integrated business; consequently, there are no separate reportable business segments.

Various “ring-fencing” measures have been taken to enhance our credit quality and the separateness between the Oncor Ring-Fenced Entities, Sempra and its affiliates (other than the Oncor Ring-Fenced Entities), and any other entities with a direct or indirect ownership interest in Oncor or Oncor Holdings. These measures serve to mitigate the Oncor Ring-Fenced Entities’ credit exposure to Sempra and its affiliates and any other direct or indirect owners of Oncor and Oncor Holdings, and to reduce the risk that the assets and liabilities of Oncor Ring-Fenced Entities would be substantively consolidated with the assets and liabilities of any Sempra entity or any other direct or indirect owners of Oncor and Oncor Holdings in connection with a bankruptcy of any such entities. Such measures include, among other things: the 19.75% equity interest held by Texas Transmission; maintenance of separate books and records for the Oncor Ring-Fenced Entities; and our board of directors being comprised of a majority of directors who meet certain independent/disinterested director standards. As a result, none of the assets of the Oncor Ring-Fenced Entities are available to satisfy the debt or obligations of any Sempra entity or any other direct or indirect owner of Oncor or Oncor Holdings. The assets and liabilities of the Oncor Ring-Fenced Entities are separate and distinct from those of any Sempra entities and any other direct or indirect owner of Oncor or Oncor Holdings. We do not bear any liability for debt or contractual obligations of Sempra and its affiliates or any other direct or indirect owner of Oncor or Oncor Holdings, and vice versa. Accordingly, our operations are conducted, and our cash flows are managed, independently from Sempra and its affiliates and any other direct or indirect owner of Oncor or Oncor Holdings.

Basis of Presentation

These unaudited condensed consolidated financial statements should be read in conjunction with the audited financial statements and related notes included in the 2018 Form 10-K. In the opinion of Oncor management, all adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the results of operations and financial position have been made. We have evaluated all subsequent events through the date the financial statements were issued. All intercompany items and transactions have been eliminated in consolidation. The results of operations for an interim period may not give a true indication of results for a full year due to seasonality (see Note 13 to Financial Statements in our 2018 Form 10-K for additional information regarding quarterly results of operations). Our consolidated financial statements have been prepared in accordance with GAAP governing rate-regulated operations. All dollar amounts in the financial statements and tables in the notes are stated in millions of U.S. dollars unless otherwise indicated.

Use of Estimates

Preparation of our financial statements requires management to make estimates and assumptions about future events that affect the reporting of assets and liabilities at the balance sheet dates and the reported amounts of revenue and expense, including fair value measurements. In the event estimates and/or assumptions prove to be different from actual amounts, adjustments are made in subsequent periods to reflect more current information. No material adjustments were made to previous estimates or assumptions during the current period.

Changes in Accounting Standards

Topic 842, “Leases” – In February 2016, the FASB issued ASU 2016-02 which created FASB Topic 842, Leases (Topic 842). Topic 842 amends previous GAAP to require the balance sheet recognition of substantially all lease assets and liabilities, including operating leases. Operating lease liabilities are not classified as debt for GAAP purposes under Topic 842 and are not treated as debt for our regulatory purposes. All of Oncor’s existing leases meet the definition of an operating lease. Under the new rules, the recognition of any finance leases (previously known as capital leases) on the balance sheet would be classified as debt for GAAP purposes and are expected to be defined as debt for our regulatory capital structure purposes (see Note 7 for details) similar to the previous capital lease treatment.

We adopted Topic 842 on January 1, 2019, using the optional transition method to apply the new guidance prospectively and not restate comparative periods. We elected the package of practical expedients that permits us to not reassess (a) whether a contract is or contains a lease, (b) lease classification or (c) determination of initial direct costs, which allows us to carry forward accounting conclusions under previous GAAP on contracts that commenced prior to adoption of the lease standard. We also elected the land easement practical expedient, which allows us to continue to account for pre-existing land easements under our accounting policy that existed before adoption of the lease standard. We did not elect the practical expedient to use hindsight in making judgments when determining the lease term.

The adoption of Topic 842 affects our balance sheet, as our contracts for office space, service centers and fleet vehicles are operating leases. The following table shows the increases on our balance sheet at January 1, 2019 from the initial adoption of Topic 842.


	At January 1, 2019
Operating Leases:
ROU assets:
Operating lease ROU and other assets	$	82

Lease liabilities:
Other current liabilities	$	26
Employee benefit, operating lease and other obligations		56
Total operating lease liabilities	$	82

Topic 220, “Income Statement—Reporting Comprehensive Income” amended by ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” – In February 2018, the FASB issued ASU 2018-02, an amendment to Topic 220. Under ASU 2018-02, an entity is required to provide certain disclosures regarding stranded tax effects, including its accounting policy related to releasing the income tax effects from AOCI. We have elected to reclassify stranded tax effects resulting from the TCJA from accumulated other comprehensive income (AOCI) to capital accounts. Our stranded tax effects in AOCI, which are related to previous interest rate cash flow hedges, were $4 million and increased our capital account upon reclassification. ASU 2018-02 is effective for our 2019 annual reporting period, including interim periods therein. We adopted the standard on a prospective basis January 1, 2019.

Regulatory Matters

3 Months Ended

Mar. 31, 2019

Regulatory Matters [Abstract]

REGULATORY MATTERS

2. REGULATORY MATTERS

Regulatory Assets and Liabilities

Recognition of regulatory assets and liabilities and the periods over which they are to be recovered or refunded through rate regulation reflect the decisions of the PUCT. Components of our regulatory assets and liabilities and their remaining recovery periods as of March 31, 2019 are provided in the table below. Amounts not currently earning a return through rate regulation are noted.


	Remaining Rate Recovery/Amortization Period
	At March 31, 2019	At March 31, 2019		At December 31, 2018
Regulatory assets:
Employee retirement liability (a)(b)(c)	To be determined	$	641	$	648
Employee retirement costs being amortized	9 years		288		297
Employee retirement costs incurred since the last rate review period (b)	To be determined		75		73
Self-insurance reserve (primarily storm recovery costs) being amortized	9 years		341		351
Self-insurance reserve incurred since the last rate review period (b)	To be determined		53		59
Securities reacquisition costs	Lives of related debt		10		10
Deferred conventional meter and metering facilities depreciation	2 years		31		36
Under-recovered AMS costs	9 years		179		185
Energy efficiency performance bonus (a)	1 year or less		5		7
Other regulatory assets	Various		31		25
Total regulatory assets			1,654		1,691

Regulatory liabilities:
Estimated net removal costs	Lives of related assets		1,043		1,023
Excess deferred taxes	Primarily over lives of related assets		1,554		1,571
Over-recovered wholesale transmission service expense (a)	1 year or less		52		89
Other regulatory liabilities	Various		25		14
Total regulatory liabilities			2,674		2,697
Net regulatory assets (liabilities)		$	(1,020)	$	(1,006)

____________

(a)

Not earning a return in the regulatory rate-setting process.

(b)

Recovery is specifically authorized by statute or by the PUCT, subject to reasonableness review.

(c)

Represents unfunded liabilities recorded in accordance with pension and OPEB accounting standards.

Regulatory Status of the TCJA

The excess deferred tax related balances above are primarily the result of the TCJA corporate federal income tax rate reduction from 35% to 21%. These regulatory liabilities reflect our obligation, as required by PUCT order in Docket No. 46957, to refund to utility customers any excess deferred tax related balances created by the reduction in the corporate federal income tax rate through reductions in our tariffs.

Docket No. 48325

In 2018, we made filings to incorporate the impacts of the TCJA into our tariffs, including the reduction in the corporate income tax rate from 35% to 21% and amortization of excess deferred federal income taxes. In the filings, we proposed a total net decrease in the revenue requirement used to set transmission and distribution rates of approximately $181 million annually as compared to the revenue requirement approved in Oncor’s most recent rate review, PUCT Docket No. 46957. In September 2018, we reached an unopposed stipulation regarding an overall settlement of the TCJA impacts. The settlement included, on an annual basis, $144 million related to the reduction of income tax expense currently in rates and $75 million related to amortization of excess deferred federal income taxes.

The settlement rates were implemented on an interim basis during 2018 and were approved by the PUCT on April 4, 2019. The final rates include the refund of the unprotected portion of excess deferred federal income taxes over a ten-year period and the protected portion over the lives of the related assets.

Docket No. 49160

During 2018, interim TCOS rates included refunds of excess deferred federal income taxes that were lower than the amount approved by the PUCT. We proposed refunding the related $9 million regulatory liability balance at March 31, 2019 over a one-month period as part of our Docket No. 49160 interim TCOS update filed in January 2019. This TCOS filing was approved by the PUCT on April 26, 2019 and the refund will be made in May 2019.

Revenues

3 Months Ended

Mar. 31, 2019

Revenues [Abstract]

REVENUES

3. REVENUES

General

Our revenue is billed monthly under tariffs approved by the PUCT and the majority of revenues are related to providing electric delivery service to consumers. Tariff rates are designed to recover the cost of providing electric delivery service to customers including a reasonable rate of return on invested capital. As the volumes delivered can be directly measured, our revenues are recognized when the underlying service has been provided in an amount prescribed by the related tariff. We recognize revenue in the amount that we have the right to invoice. Substantially all of our revenues are from contracts with customers except for alternative revenue program revenues discussed below.

Reconcilable Tariffs

The PUCT has designated certain tariffs (primarily TCRF and EECRF) as reconcilable, which means the differences between amounts billed under these tariffs and the related incurred costs are deferred as either regulatory assets or regulatory liabilities. Accordingly, at prescribed intervals, future tariffs are adjusted to either repay regulatory liabilities or collect regulatory assets.

Alternative Revenue Program

The PUCT has implemented an incentive program allowing us to earn performance bonuses by exceeding PUCT energy efficiency program targets. This incentive program and the related performance bonus revenues are considered an “alternative revenue program” under GAAP. Annual performance bonuses are recognized as revenue when approved by the PUCT, typically in the third or fourth quarter each year.

Disaggregation of Revenues

The following table reflects electric delivery revenues disaggregated by tariff for the three months ended March 31, 2019 and 2018:


	Three Months Ended March 31,
	2019		2018
Operating revenues
Revenues contributing to earnings:
Distribution base revenues	$	499	$	507
Transmission base revenues (TCOS revenues):
Billed to third-party wholesale customers		143		125
Billed to REPs serving Oncor distribution customers, through TCRF		85		78
Total transmission base revenues		228		203
Other miscellaneous revenues		17		16
Total revenues contributing to earnings		744		726

Revenues collected for pass-through expenses:
TCRF - third-party wholesale transmission service		260		245
EECRF and other regulatory charges		12		19
Revenues collected for pass-through expenses		272		264

Total operating revenues	$	1,016	$	990

Customers

Our distribution customers consist of approximately 90 REPs and certain electric cooperatives in our certificated service area. The consumers of the electricity we deliver are free to choose their electricity supplier from REPs who compete for their business. Our transmission base revenues are collected from load serving entities benefitting from our transmission system. Our transmission customers consist of municipalities, electric cooperatives and other distribution companies. REP subsidiaries of our two largest counterparties represented 23% and 19% of our total operating revenues for the three months ended March 31, 2019. No other customer represented more than 10% of our total operating revenues.

Variability

Our revenues and cash flows are subject to seasonality, timing of customer billings, weather conditions and other electricity usage drivers, with revenues being highest in the summer. Payment is due 35 days after invoicing. Under a PUCT rule relating to the Certification of Retail Electric Providers, write-offs of uncollectible amounts owed by nonaffiliated REPs are recoverable as a regulatory asset.

Pass-through Expenses

Expenses which are allowed to be passed-through to customers (primarily, third party wholesale transmission service and energy efficiency program costs) are generally recognized as revenue at the time the costs are incurred. Franchise taxes are assessed by local governmental bodies, based on kWh delivered and are not a “pass-through” item. The rates we charge customers are intended to recover the franchise taxes, but we are not acting as an agent to collect the taxes from customers; therefore, franchise taxes are reported as a principal component of “taxes other than amounts related to income taxes” instead of a reduction to “revenues” in the income statement.

Short-Term Borrowings

3 Months Ended

Mar. 31, 2019

Short-Term Borrowings [Abstract]

SHORT-TERM BORROWINGS

4. SHORT-TERM BORROWINGS

At March 31, 2019 and December 31, 2018, outstanding short-term borrowings under our CP Program and Credit Facility consisted of the following:


	At March 31,		At December 31,
	2019		2018
Total borrowing capacity	$	2,000	$	2,000
Commercial paper outstanding (a)		(1,141)		(813)
Credit facility outstanding (b)		-		-
Letters of credit outstanding (c)		(10)		(9)
Available unused credit	$	849	$	1,178

____________

The weighted average interest rates for commercial paper at March 31, 2019 and December 31, 2018 were 2.81% and 2.74%, respectively.

At March 31, 2019, the applicable interest rate for any outstanding borrowings would have been LIBOR plus 1.00%

The interest rate on outstanding letters of credit at both March 31, 2019 and December 31, 2018 was 1.20% based on our credit ratings.

CP Program

In March 2018, we established the CP Program, under which we may issue unsecured commercial paper notes (Notes) on a private placement basis up to a maximum aggregate face or principal amount outstanding at any time of $2.0 billion. The proceeds of Notes issued under the CP Program are used for working capital and general corporate purposes. The CP Program obtains liquidity support from our Credit Facility discussed below. If at any time funds are not available on favorable terms under the CP Program, we may utilize the Credit Facility for funding.

Credit Facility

At March 31, 2019, we had a $2.0 billion unsecured revolving Credit Facility to be used for working capital and general corporate purposes, issuances of letters of credit and support for commercial paper issuances. We may request increases in our borrowing capacity in increments of not less than $100 million, not to exceed $400 million in the aggregate provided certain conditions are met, including lender approvals. The Credit Facility’s five-year term expires in November 2022 and gives us the option of requesting up to two one-year extensions, with such extensions subject to certain conditions and lender approvals. Borrowings are classified as short-term on the balance sheet.

Long-Term Debt

3 Months Ended

Mar. 31, 2019

Long-Term Debt [Abstract]

LONG-TERM DEBT

5. LONG-TERM DEBT

Our senior notes are secured by a first priority lien on certain transmission and distribution assets equally and ratably with all of Oncor’s other secured indebtedness. See “Deed of Trust” below for additional information. At March 31, 2019 and December 31, 2018, our long-term debt consisted of the following:


	March 31,		December 31,
	2019		2018
Secured:
2.15% Fixed Senior Notes due June 1, 2019	$	250	$	250
5.75% Fixed Senior Notes due September 30, 2020		126		126
4.10% Fixed Senior Notes due June 1, 2022		400		400
7.00% Fixed Debentures due September 1, 2022		482		482
2.95% Fixed Senior Notes due April 1, 2025		350		350
3.70% Fixed Senior Notes due November 15, 2028		350		350
5.75% Fixed Senior Notes due March 15, 2029		318		318
7.00% Fixed Senior Notes due May 1, 2032		500		500
7.25% Fixed Senior Notes due January 15, 2033		350		350
7.50% Fixed Senior Notes due September 1, 2038		300		300
5.25% Fixed Senior Notes due September 30, 2040		475		475
4.55% Fixed Senior Notes due December 1, 2041		400		400
5.30% Fixed Senior Notes due June 1, 2042		500		500
3.75% Fixed Senior Notes due April 1, 2045		550		550
3.80% Fixed Senior Notes due September 30, 2047		325		325
4.10% Fixed Senior Notes due November 15, 2048		450		450
Secured long-term debt		6,126		6,126
Unsecured:
Term loan credit agreement maturing December 9, 2019		350		350
Total long-term debt		6,476		6,476
Unamortized discount and debt issuance costs		(41)		(41)
Less amount due currently		(600)		(600)
Long-term debt, less amounts due currently	$	5,835	$	5,835

Deed of Trust

Our secured indebtedness is secured equally and ratably by a first priority lien on property we acquired or constructed for the transmission and distribution of electricity. The property is mortgaged under the Deed of Trust. The Deed of Trust permits us to secure indebtedness (excluding borrowings under the CP Program, the Credit Facility and the term loan credit agreement) with the lien of the Deed of Trust up to the aggregate of (i) the amount of available bond credits, and (ii) 85% of the lower of the fair value or cost of certain property additions that could be certified to the Deed of Trust collateral agent. At March 31, 2019, the amount of available bond credits was $3.583 billion and the amount of future debt we could secure with property additions, subject to those property additions being certified to the Deed of Trust collateral agent, was $2.720 billion.

Borrowings under the CP Program, Credit Facility and the term loan credit agreement are not secured.

Fair Value of Long-Term Debt

At March 31, 2019 and December 31, 2018, the estimated fair value of our long-term debt (including current maturities) totaled $7.343 billion and $7.086 billion, respectively, and the carrying amount totaled $6.435 billion and $6.435 billion, respectively. The fair value is estimated using observable market data, representing Level 2 valuations under accounting standards related to the determination of fair value.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2019

Commitments and Contingencies [Abstract]

COMMITMENTS AND CONTINGENCIES

6. COMMITMENTS AND CONTINGENCIES

Legal/Regulatory Proceedings

We are involved in various legal and administrative proceedings in the normal course of business, the ultimate resolution of which, in the opinion of management, should not have a material effect upon our financial position, results of operations or cash flows. See Note 2 and Note 11 in this report and Note 8 to Financial Statements in our 2018 Form 10-K for additional information regarding our regulatory and legal proceedings, respectively.

Leases

General

A lease exists when a contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. As lessee, our leased assets primarily consist of our vehicle fleet and real estate leased for company offices and service centers. Our leases are accounted for as operating leases for both GAAP and rate-making purposes. We generally recognize operating lease costs on a straight-line basis over the lease term in operating expenses. We are not a lessor to any material lease contracts.

As of the lease commencement date, we recognize a lease liability for our obligation to make lease payments, which we initially measure at present value using our incremental borrowing rate at the date of lease commencement, unless the rate implicit in the lease is readily determinable. We determine our incremental borrowing rate based on the rate of interest that we would have to pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. We also record a ROU asset for our right to use the underlying asset, which is initially equal to the lease liability and adjusted for any lease payments made at or before lease commencement, lease incentives and any initial direct costs.

Some of our lease agreements contain nonlease components, which represent items or activities that transfer a good or service. We separate lease components from nonlease components, if any, for our fleet vehicle and real estate leases for purposes of calculating the related lease liability and ROU asset.

Certain of our leases include options to extend the lease terms for up to 20 years, while others include options to terminate early. Our lease liabilities and ROU assets are based on lease terms that may include such options to extend or terminate the lease when it is reasonably certain that we will exercise that option.

Short-term Leases

Some of our contracts are short-term leases, which have a lease term of 12 months or less at lease commencement. As allowed by GAAP, we do not recognize a lease liability or ROU asset arising from short-term leases for all existing classes of underlying assets. We recognize short-term lease costs on a straight-line basis over the lease term.

Lease Obligations, Lease Costs and Other Supplemental Data

The following tables summarize lease information for the first quarter of 2019.


	At March 31,
	2019
Operating Leases:
ROU assets:
Operating lease ROU assets and other	$	88

Lease liabilities:
Other current liabilities	$	28
Employee benefit, operating lease and other obligations		60
Total operating lease liabilities	$	88

Weighted-average remaining lease term (in years)		4
Weighted-average discount rate		3.4%

The components of lease costs and cash paid for amounts included in the measurement of lease liabilities were as follows:


	Three Months Ended
	March 31, 2019
Operating lease cost:
Operating lease costs (including amounts allocated to property, plant and equipment)	$	10
Short-term lease costs		11
Total operating lease costs	$	21

Operating lease payments:
Cash paid for amounts included in the measurement of lease liabilities	$	7

The table below presents the maturity analysis of our lease liabilities and reconciliation to the present value of lease liabilities:


Year	Amount
2019 (remaining nine months)	$	23
2020		22
2021		20
2022		15
2023		8
Thereafter		6
Total undiscounted lease payments		94
Less imputed interest		(6)
Total future minimum lease payments	$	88

Lease Disclosures Under Previous GAAP

The table below presents the future minimum lease payments under previous GAAP:


Year	Amount
2019	$	29
2020		22
2021		20
2022		15
2023		8
Thereafter		5
Total future minimum lease payments	$	99

Membership Interests

3 Months Ended

Mar. 31, 2019

Membership Interests [Abstract]

MEMBERSHIP INTERESTS

7. MEMBERSHIP INTERESTS

Cash Distributions

Distributions are limited by the requirement to maintain our regulatory capital structure at or below the assumed debt-to-equity ratio established periodically by the PUCT for ratemaking purposes, which is currently 57.5% debt to 42.5% equity. At March 31, 2019, $160 million was available for distribution to our members, as our regulatory capitalization ratio was 56.7% debt to 43.3% equity. The PUCT has the authority to determine what types of debt and equity are included in a utility’s debt-to-equity ratio. For purposes of this ratio, debt is calculated as long-term debt including finance leases plus unamortized gains on reacquired debt less unamortized issuance expenses, premiums and losses on reacquired debt. Equity is calculated as membership interests determined in accordance with GAAP, excluding the effects of acquisition accounting from a 2007 transaction (which included recording the initial goodwill and fair value adjustments and subsequent related impairments and amortization).

On May 1, 2019, our board of directors declared a cash distribution of $71 million, which was paid to our members on May 2, 2019.

Cash Contributions

On April 30, 2019, our members made capital contributions of $70 million.

Membership Interests

The following table presents the changes to membership interests during the three months ended March 31, 2019 and 2018, net of tax:


	Capital Accounts		Accumulated Other Comprehensive Income (Loss)		Total Membership Interests
Balance at December 31, 2018	$	8,624	$	(164)	$	8,460
Net income		116		-		116
Distributions		(71)		-		(71)
Capital contributions		70		-		70
Net effects of cash flow hedges (Note 1)		4		(4)		-
Defined benefit pension plans		-		1		1
Balance at March 31, 2019	$	8,743	$	(167)	$	8,576

Balance at December 31, 2017	$	8,004	$	(101)	$	7,903
Net income		89		-		89
Defined benefit pension plans		-		1		1
Balance at March 31, 2018	$	8,093	$	(100)	$	7,993

Accumulated Other Comprehensive Income (Loss)

The following table presents the changes to accumulated other comprehensive income (loss) for the three months ended March 31, 2019 and 2018, net of tax:


	Cash Flow Hedges – Interest Rate Swap		Defined Benefit Pension and OPEB Plans		Accumulated Other Comprehensive Income (Loss)
Balance at December 31, 2018	$	(16)	$	(148)	$	(164)
Defined benefit pension plans		-		1		1
Amounts reclassified from accumulated other comprehensive income (loss) to the capital account (Note 1)		(4)		-		(4)
Balance at March 31, 2019	$	(20)	$	(147)	$	(167)

Balance at December 31, 2017	$	(18)	$	(83)	$	(101)
Defined benefit pension plans		-		1		1
Balance at March 31, 2018	$	(18)	$	(82)	$	(100)

Pension and OPEB Plans

3 Months Ended

Mar. 31, 2019

Pension and OPEB Plans [Abstract]

Pension and OPEB Plans

8. PENSION AND OPEB PLANS

Pension Plans

We sponsor the Oncor Retirement Plan and also have liabilities under the Vistra Retirement Plan, both of which are qualified pension plans under Section 401(a) of the Internal Revenue Code of 1986, as amended, and are subject to the provisions of ERISA. Employees do not contribute to either plan. We also have a supplemental pension plan for certain employees whose retirement benefits cannot be fully earned under the qualified retirement plans. See Note 10 to Financial Statements in our 2018 Form 10-K for additional information regarding pension plans.

OPEB Plans

We currently sponsor two OPEB plans. One plan covers our eligible current and future retirees whose services are 100% attributed to the regulated business. Effective January 1, 2018, we established a second plan to cover EFH Corp./Vistra retirees and eligible current and future retirees whose employment services were assigned to both Oncor (or a predecessor regulated utility business) and the non-regulated business of EFH Corp./Vistra. Vistra is solely responsible for its portion of the liability for retiree benefits related to those retirees. See Note 10 to Financial Statements in our 2018 Form 10-K for additional information.

Pension and OPEB Costs

Our net costs related to pension plans and the Oncor OPEB Plans for the three months ended March 31, 2019 and 2018 were comprised of the following:


	Three Months Ended March 31,
	2019		2018

Components of net allocated pension costs:
Service cost	$	7	$	7
Interest cost		32		30
Expected return on assets		(30)		(30)
Amortization of net loss		7		12
Net pension costs		16		19
Components of net OPEB costs:
Service cost		2		2
Interest cost		11		11
Expected return on assets		(2)		(2)
Amortization of prior service cost		(5)		(7)
Amortization of net loss		4		14
Net OPEB costs		10		18
Total net pension and OPEB costs		26		37
Less amounts deferred principally as property or a regulatory asset		(7)		(18)
Net amounts recognized as operation and maintenance expense or other deductions	$	19	$	19

The discount rates reflected in net pension and OPEB costs in 2019 are 4.16%, 4.40% and 4.41% for the Oncor Retirement Plan, the Vistra Retirement Plan and the Oncor OPEB Plans, respectively. The expected return on pension and OPEB plan assets reflected in the 2019 cost amounts are 5.43%, 5.29% and 6.19% for the Oncor Retirement Plan, the Vistra Retirement Plan and the Oncor OPEB Plans, respectively.

Pension and OPEB Plans Cash Contributions

We made cash contributions to the pension plans and Oncor OPEB Plans of $1 million and $9 million, respectively, during the three months ended March 31, 2019. We expect to make additional cash contributions to the pension plans and Oncor OPEB Plans of $40 million and $26 million, respectively, during the remainder of 2019. Our aggregate pension plans and Oncor OPEB Plans funding is expected to total approximately $538 million and $179 million, respectively, in the 2019 to 2023 period based on the latest actuarial projections.

Related-Party Transactions

3 Months Ended

Mar. 31, 2019

RELATED-PARTY TRANSACTIONS

9. RELATED-PARTY TRANSACTIONS

The following represent our significant related-party transactions. As a result of the Sempra Acquisition, Sempra became a related party and the Sponsor Group ceased to be a related party as of March 9, 2018.

We are not a member of another entity’s consolidated tax group, but our owners’ federal income tax returns include their portion of our results. Under the terms of a tax sharing agreement among us, Oncor Holdings, Texas Transmission and STH (as successor to EFH Corp.), we are generally obligated to make payments to our owners, pro rata in accordance with their respective membership interests, in an aggregate amount that is substantially equal to the amount of federal income taxes that we would have been required to pay if we were filing our own corporate income tax return. STH will file a combined Texas margin tax return that includes our results and our share of Texas margin tax payments, which are accounted for as income taxes and calculated as if we were filing our own return. See discussion in Note 1 to Financial Statements in our 2018 Form 10-K under “Provision in Lieu of Income Taxes.” Under the “in lieu of” tax concept, all in lieu of tax assets and tax liabilities represent amounts that will eventually be settled with our members. In the event such amounts are not paid under the tax sharing agreement, it is probable that this regulatory liability will continue to be included in Oncor’s rate setting processes.

Amounts payable to (receivable from) members related to income taxes under the tax sharing agreement and reported on our balance sheet consisted of the following:


	At March 31, 2019						At December 31, 2018
	STH		Texas Transmission		Total		STH		Texas Transmission		Total

Federal income taxes payable (receivable)	$	10	$	2	$	12	$	4	$	1	$	5
Texas margin taxes payable		27		-		27		21		-		21
Net payable (receivable)	$	37	$	2	$	39	$	25	$	1	$	26

There were no cash payments made to (received from) members related to income taxes for the three months ended March 31, 2019. For the three months ended March 31, 2018, Oncor received $19 million related to income taxes from EFH Corp.

As of March 8, 2018, approximately 16% of the equity in an existing vendor of the company was owned by a member of the Sponsor Group. During 2018, this vendor performed transmission and distribution system construction and maintenance services for us. Cash payments were made for such services to this vendor and/or its subsidiaries totaling $35 million for the year-to-date period ended March 8, 2018, of which approximately $33 million was capitalized and $2 million was recorded as an operation and maintenance expense.

See Note 7 for information regarding distributions to and capital contributions from members.

Supplementary Financial Information

3 Months Ended

Mar. 31, 2019

Supplementary Financial Information [Abstract]

SUPPLEMENTARY FINANCIAL INFORMATION

10. SUPPLEMENTARY FINANCIAL INFORMATION

Other Income and (Deductions)


	Three Months Ended March 31,
	2019		2018

Professional fees	$	(3)	$	(3)
Sempra Acquisition related costs		-		(16)
Recoverable pension and OPEB - non-service costs		(14)		(13)
Total other income and (deductions) - net	$	(17)	$	(32)

Interest Expense and Related Charges


	Three Months Ended March 31,
	2019		2018

Interest	$	88	$	89
Amortization of debt issuance costs and discounts		1		1
Less allowance for funds used during construction – capitalized interest portion		(3)		(2)
Total interest expense and related charges	$	86	$	88

Trade Accounts and Other Receivables

Trade accounts and other receivables reported on our balance sheet consisted of the following:


	At March 31,		At December 31,
	2019		2018

Gross trade accounts and other receivables	$	596	$	562
Allowance for uncollectible accounts		(4)		(3)
Trade accounts receivable – net	$	592	$	559

At March 31, 2019, REP subsidiaries of our two largest counterparties represented approximately 14% and 12% of the trade accounts receivable balance and at December 31, 2018, represented approximately 13% and 10% of the trade accounts receivable balance.

Under a PUCT rule relating to the Certification of Retail Electric Providers, write-offs of uncollectible amounts owed by nonaffiliated REPs are deferred as a regulatory asset.

Investments and Other Property

Investments and other property reported on our balance sheet consisted of the following:


	At March 31,		At December 31,
	2019		2018

Assets related to employee benefit plans, including employee savings programs	$	107	$	108
Land		12		12
Total investments and other property	$	119	$	120

Property, Plant and Equipment

Property, plant and equipment reported on our balance sheet consisted of the following:


	Composite Depreciation Rate/	At March 31,		At December 31,
	Avg. Life at March 31, 2019	2019		2018
Assets in service:
Distribution	2.8% / 35.2 years	$	13,295	$	13,105
Transmission	2.9% / 34.4 years		8,609		8,568
Other assets	6.9% / 14.6 years		1,489		1,497
Total			23,393		23,170
Less accumulated depreciation			7,594		7,513
Net of accumulated depreciation			15,799		15,657
Construction work in progress			639		417
Held for future use			17		16
Property, plant and equipment – net		$	16,455	$	16,090

Intangible Assets

Intangible assets (other than goodwill) reported on our balance sheet as part of property, plant and equipment consisted of the following:


	At March 31, 2019						At December 31, 2018
	Gross						Gross
	Carrying		Accumulated				Carrying		Accumulated
	Amount		Amortization		Net		Amount		Amortization		Net

Identifiable intangible assets subject to amortization:
Land easements	$	462	$	101	$	361	$	464	$	101	$	363
Capitalized software		787		397		390		787		385		402
Total	$	1,249	$	498	$	751	$	1,251	$	486	$	765

Aggregate amortization expense for intangible assets totaled $13 million and $12 million for the three months ended March 31, 2019 and 2018, respectively. The estimated aggregate amortization expense for each of the next five fiscal years is as follows:


Year	Amortization Expense
2019	$	50
2020		49
2021		49
2022		49
2023		49

Employee Benefit, Operating Lease and Other Obligations

Employee benefit, operating lease and other obligations reported on our balance sheet consisted of the following:


	At March 31,		At December 31,
	2019		2018

Retirement plans and other employee benefits	$	1,856	$	1,858
Operating lease liabilities		58		-
Investment tax credits		7		8
Other		91		77
Total employee benefit, operating lease and other obligations	$	2,012	$	1,943

Supplemental Cash Flow Information


	Three Months Ended March 31,
	2019		2018

Cash payments (receipts) related to:
Interest (a)	$	56	$	101
Less capitalized interest		(3)		(2)
Interest payments (net of amounts capitalized)	$	53	$	99
Amount in lieu of income taxes (b):
Federal	$	-	$	(19)

Noncash construction expenditures (c)	$	168	$	125
Noncash increase in operating lease obligations for ROU assets	$	88	$	-

____________

(a)

Excludes March 2019 interest payments that were paid on April 1, 2019.

(b)

See Note 9 for income tax related detail.

(c)

Represents end-of-period accruals.

Pending Infrareit Acquisition	3 Months Ended
Pending Infrareit Acquisition	Mar. 31, 2019
Pending Infrareit Acquisition [Abstract]
Pending Infrareit Acquisition	11. PENDING INFRAREIT ACQUISITION On October 18, 2018, we entered into the InfraREIT Merger Agreement, pursuant to which we plan to acquire all of the equity interests of InfraREIT and its subsidiary, InfraREIT Partners, subject to the conditions discussed below. The InfraREIT Acquisition will occur through the merger of InfraREIT with and into a newly formed wholly-owned subsidiary of Oncor, followed by the merger of another newly formed wholly-owned subsidiary of Oncor with and into InfraREIT Partners. The stockholders of InfraREIT and the limited partners of InfraREIT Partners will each receive $21.00 in cash per share of common stock or limited partnership unit, as applicable. The total purchase price based on the number of shares and limited partnership units of InfraREIT and InfraREIT Partners currently outstanding is approximately $1.275 billion. In addition, we will bear certain transaction costs incurred by InfraREIT (including a management agreement termination fee of approximately $40.5 million that InfraREIT has agreed to pay Hunt Consolidated, Inc. at closing). The acquisition also includes InfraREIT’s outstanding debt, which totaled $946 million at March 31, 2019. In connection with entering into the InfraREIT Merger Agreement, we have received a commitment letter from Sempra and certain indirect equity holders of Texas Transmission (collectively, Equity Commitment Parties), pursuant to which, subject to the terms and conditions set forth therein, the Equity Commitment Parties have committed to provide their pro rata share of capital contributions to us in an aggregate principal amount of up to $1.330 billion, to fund the cash consideration payable by us in the InfraREIT Acquisition and the payment of related fees and expenses. The funding provided for in the commitment letter is contingent on the satisfaction of customary conditions, including the substantially simultaneous closing of the transactions contemplated by the InfraREIT Merger Agreement, but is not a condition to the closing of the InfraREIT Acquisition. As a condition to the InfraREIT Acquisition, InfraREIT’s subsidiary, SDTS, and SDTS’s tenant, SU, will complete an asset exchange (SDTS-SU Asset Exchange) immediately prior to the closing of the InfraREIT Acquisition, pursuant to which SDTS will exchange certain of its south Texas assets for certain north Texas assets owned by SU. As a result, upon closing of the InfraREIT Acquisition, we will own all of SDTS’s and SU’s assets and projects in north, central and west Texas and SU will own its and SDTS’s assets in south Texas. In addition, as a condition to the closing of the SDTS-SU Asset Exchange, Sempra will acquire an indirect 50 percent limited partnership interest in SU (Sempra-SU Transaction). As a result of the Sempra-SU Transaction, SU will be our affiliate for purposes of PUCT rules. Oncor, InfraREIT and InfraREIT Partners have agreed to use their respective reasonable best efforts, subject to certain exceptions, to consummate the InfraREIT Acquisition as promptly as practicable. Closing of the InfraREIT Acquisition is subject to the satisfaction of customary closing conditions and consents, including the approval of the PUCT. Oncor, SU, SDTS and Sempra filed a single, integrated joint application for regulatory approvals with the PUCT on November 30, 2018 in PUCT Docket No. 48929. For more information on the PUCT Docket, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Regulation and Rates – Matters with the PUCT.” PUCT approval is the final remaining regulatory approval required with respect to the InfraREIT Acquisition. In December 2018, early termination of the 30-day waiting period required by the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, was granted. In March 2019, approval was received from FERC and clearance was received from the Committee on Foreign Investment in the United States. In addition, InfraREIT’s stockholders voted to adopt the InfraREIT Merger Agreement at a special meeting of its stockholders in February 2019.

Business and Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2019

Business and Significant Accounting Policies [Abstract]

Description Of Business

Description of Business

References in this report to “we,” “our,” “us” and “the company” are to Oncor and/or its subsidiaries. See “Glossary” for definition of terms and abbreviations.

Basis Of Presentation

Basis of Presentation

Use Of Estimates

Use of Estimates

Changes In Accounting Standards

Changes in Accounting Standards


	At January 1, 2019
Operating Leases:
ROU assets:
Operating lease ROU and other assets	$	82

Lease liabilities:
Other current liabilities	$	26
Employee benefit, operating lease and other obligations		56
Total operating lease liabilities	$	82

Business and Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2019

Business and Significant Accounting Policies [Abstract]

Schedule Of Adoption Of Topic 842


	At January 1, 2019
Operating Leases:
ROU assets:
Operating lease ROU and other assets	$	82

Lease liabilities:
Other current liabilities	$	26
Employee benefit, operating lease and other obligations		56
Total operating lease liabilities	$	82

Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2019

Regulatory Matters [Abstract]

Components Of Regulatory Assets And Liabilities


	Remaining Rate Recovery/Amortization Period
	At March 31, 2019	At March 31, 2019		At December 31, 2018
Regulatory assets:
Employee retirement liability (a)(b)(c)	To be determined	$	641	$	648
Employee retirement costs being amortized	9 years		288		297
Employee retirement costs incurred since the last rate review period (b)	To be determined		75		73
Self-insurance reserve (primarily storm recovery costs) being amortized	9 years		341		351
Self-insurance reserve incurred since the last rate review period (b)	To be determined		53		59
Securities reacquisition costs	Lives of related debt		10		10
Deferred conventional meter and metering facilities depreciation	2 years		31		36
Under-recovered AMS costs	9 years		179		185
Energy efficiency performance bonus (a)	1 year or less		5		7
Other regulatory assets	Various		31		25
Total regulatory assets			1,654		1,691

Regulatory liabilities:
Estimated net removal costs	Lives of related assets		1,043		1,023
Excess deferred taxes	Primarily over lives of related assets		1,554		1,571
Over-recovered wholesale transmission service expense (a)	1 year or less		52		89
Other regulatory liabilities	Various		25		14
Total regulatory liabilities			2,674		2,697
Net regulatory assets (liabilities)		$	(1,020)	$	(1,006)

____________

(a)

Not earning a return in the regulatory rate-setting process.

(b)

Recovery is specifically authorized by statute or by the PUCT, subject to reasonableness review.

(c)

Represents unfunded liabilities recorded in accordance with pension and OPEB accounting standards.

Revenues (Tables)

3 Months Ended

Mar. 31, 2019

Revenues [Abstract]

Disaggregation Of Revenues


	Three Months Ended March 31,
	2019		2018
Operating revenues
Revenues contributing to earnings:
Distribution base revenues	$	499	$	507
Transmission base revenues (TCOS revenues):
Billed to third-party wholesale customers		143		125
Billed to REPs serving Oncor distribution customers, through TCRF		85		78
Total transmission base revenues		228		203
Other miscellaneous revenues		17		16
Total revenues contributing to earnings		744		726

Revenues collected for pass-through expenses:
TCRF - third-party wholesale transmission service		260		245
EECRF and other regulatory charges		12		19
Revenues collected for pass-through expenses		272		264

Total operating revenues	$	1,016	$	990

Short-Term Borrowings (Tables)

3 Months Ended

Mar. 31, 2019

Short-Term Borrowings [Abstract]

Schedule Of Short-Term Borrowings


	At March 31,		At December 31,
	2019		2018
Total borrowing capacity	$	2,000	$	2,000
Commercial paper outstanding (a)		(1,141)		(813)
Credit facility outstanding (b)		-		-
Letters of credit outstanding (c)		(10)		(9)
Available unused credit	$	849	$	1,178

____________

The weighted average interest rates for commercial paper at March 31, 2019 and December 31, 2018 were 2.81% and 2.74%, respectively.

At March 31, 2019, the applicable interest rate for any outstanding borrowings would have been LIBOR plus 1.00%

The interest rate on outstanding letters of credit at both March 31, 2019 and December 31, 2018 was 1.20% based on our credit ratings.

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2019

Long-Term Debt [Abstract]

Schedule Of Long-Term Debt


	March 31,		December 31,
	2019		2018
Secured:
2.15% Fixed Senior Notes due June 1, 2019	$	250	$	250
5.75% Fixed Senior Notes due September 30, 2020		126		126
4.10% Fixed Senior Notes due June 1, 2022		400		400
7.00% Fixed Debentures due September 1, 2022		482		482
2.95% Fixed Senior Notes due April 1, 2025		350		350
3.70% Fixed Senior Notes due November 15, 2028		350		350
5.75% Fixed Senior Notes due March 15, 2029		318		318
7.00% Fixed Senior Notes due May 1, 2032		500		500
7.25% Fixed Senior Notes due January 15, 2033		350		350
7.50% Fixed Senior Notes due September 1, 2038		300		300
5.25% Fixed Senior Notes due September 30, 2040		475		475
4.55% Fixed Senior Notes due December 1, 2041		400		400
5.30% Fixed Senior Notes due June 1, 2042		500		500
3.75% Fixed Senior Notes due April 1, 2045		550		550
3.80% Fixed Senior Notes due September 30, 2047		325		325
4.10% Fixed Senior Notes due November 15, 2048		450		450
Secured long-term debt		6,126		6,126
Unsecured:
Term loan credit agreement maturing December 9, 2019		350		350
Total long-term debt		6,476		6,476
Unamortized discount and debt issuance costs		(41)		(41)
Less amount due currently		(600)		(600)
Long-term debt, less amounts due currently	$	5,835	$	5,835

Commitments And Contingencies (Tables)

3 Months Ended

Mar. 31, 2019

Commitments and Contingencies [Abstract]

Schedule Of Lease Information


	At March 31,
	2019
Operating Leases:
ROU assets:
Operating lease ROU assets and other	$	88

Lease liabilities:
Other current liabilities	$	28
Employee benefit, operating lease and other obligations		60
Total operating lease liabilities	$	88

Weighted-average remaining lease term (in years)		4
Weighted-average discount rate		3.4%

Schedule Of Lease Costs


	Three Months Ended
	March 31, 2019
Operating lease cost:
Operating lease costs (including amounts allocated to property, plant and equipment)	$	10
Short-term lease costs		11
Total operating lease costs	$	21

Operating lease payments:
Cash paid for amounts included in the measurement of lease liabilities	$	7

Schedule Of Operating Lease Maturity


Year	Amount
2019 (remaining nine months)	$	23
2020		22
2021		20
2022		15
2023		8
Thereafter		6
Total undiscounted lease payments		94
Less imputed interest		(6)
Total future minimum lease payments	$	88

Schedule Of Future Miinimum Lease Payments Under Operating Leases


Year	Amount
2019	$	29
2020		22
2021		20
2022		15
2023		8
Thereafter		5
Total future minimum lease payments	$	99

Membership Interests (Tables)

3 Months Ended

Mar. 31, 2019

Membership Interests [Abstract]

Schedule Of Changes To Membership Interests


	Capital Accounts		Accumulated Other Comprehensive Income (Loss)		Total Membership Interests
Balance at December 31, 2018	$	8,624	$	(164)	$	8,460
Net income		116		-		116
Distributions		(71)		-		(71)
Capital contributions		70		-		70
Net effects of cash flow hedges (Note 1)		4		(4)		-
Defined benefit pension plans		-		1		1
Balance at March 31, 2019	$	8,743	$	(167)	$	8,576

Balance at December 31, 2017	$	8,004	$	(101)	$	7,903
Net income		89		-		89
Defined benefit pension plans		-		1		1
Balance at March 31, 2018	$	8,093	$	(100)	$	7,993

Schedule Of Changes To Accumulated Other Comprehensive Income (Loss)


	Cash Flow Hedges – Interest Rate Swap		Defined Benefit Pension and OPEB Plans		Accumulated Other Comprehensive Income (Loss)
Balance at December 31, 2018	$	(16)	$	(148)	$	(164)
Defined benefit pension plans		-		1		1
Amounts reclassified from accumulated other comprehensive income (loss) to the capital account (Note 1)		(4)		-		(4)
Balance at March 31, 2019	$	(20)	$	(147)	$	(167)

Balance at December 31, 2017	$	(18)	$	(83)	$	(101)
Defined benefit pension plans		-		1		1
Balance at March 31, 2018	$	(18)	$	(82)	$	(100)

Pension and OPEB Plans (Tables)

3 Months Ended

Mar. 31, 2019

Pension and OPEB Plans [Abstract]

Schedule Of Pension And OPEB Plan Costs


	Three Months Ended March 31,
	2019		2018

Components of net allocated pension costs:
Service cost	$	7	$	7
Interest cost		32		30
Expected return on assets		(30)		(30)
Amortization of net loss		7		12
Net pension costs		16		19
Components of net OPEB costs:
Service cost		2		2
Interest cost		11		11
Expected return on assets		(2)		(2)
Amortization of prior service cost		(5)		(7)
Amortization of net loss		4		14
Net OPEB costs		10		18
Total net pension and OPEB costs		26		37
Less amounts deferred principally as property or a regulatory asset		(7)		(18)
Net amounts recognized as operation and maintenance expense or other deductions	$	19	$	19

Related-Party Transactions (Tables)

3 Months Ended

Mar. 31, 2019

Schedule Of Trade Accounts And Other Receivables From Related Parties


	At March 31, 2019						At December 31, 2018
	STH		Texas Transmission		Total		STH		Texas Transmission		Total

Federal income taxes payable (receivable)	$	10	$	2	$	12	$	4	$	1	$	5
Texas margin taxes payable		27		-		27		21		-		21
Net payable (receivable)	$	37	$	2	$	39	$	25	$	1	$	26

Supplementary Financial Information (Tables)

3 Months Ended

Mar. 31, 2019

Supplementary Financial Information [Abstract]

Schedule Of Other Income And (Deductions)


	Three Months Ended March 31,
	2019		2018

Professional fees	$	(3)	$	(3)
Sempra Acquisition related costs		-		(16)
Recoverable pension and OPEB - non-service costs		(14)		(13)
Total other income and (deductions) - net	$	(17)	$	(32)

Schedule Of Interest Expense And Related Charges


	Three Months Ended March 31,
	2019		2018

Interest	$	88	$	89
Amortization of debt issuance costs and discounts		1		1
Less allowance for funds used during construction – capitalized interest portion		(3)		(2)
Total interest expense and related charges	$	86	$	88

Schedule Of Trade Accounts And Other Receivables


	At March 31,		At December 31,
	2019		2018

Gross trade accounts and other receivables	$	596	$	562
Allowance for uncollectible accounts		(4)		(3)
Trade accounts receivable – net	$	592	$	559

Summary of Investments And Other Property


	At March 31,		At December 31,
	2019		2018

Assets related to employee benefit plans, including employee savings programs	$	107	$	108
Land		12		12
Total investments and other property	$	119	$	120

Schedule Of Property, Plant And Equipment


	Composite Depreciation Rate/	At March 31,		At December 31,
	Avg. Life at March 31, 2019	2019		2018
Assets in service:
Distribution	2.8% / 35.2 years	$	13,295	$	13,105
Transmission	2.9% / 34.4 years		8,609		8,568
Other assets	6.9% / 14.6 years		1,489		1,497
Total			23,393		23,170
Less accumulated depreciation			7,594		7,513
Net of accumulated depreciation			15,799		15,657
Construction work in progress			639		417
Held for future use			17		16
Property, plant and equipment – net		$	16,455	$	16,090

Schedule Of Intangible Assets


	At March 31, 2019						At December 31, 2018
	Gross						Gross
	Carrying		Accumulated				Carrying		Accumulated
	Amount		Amortization		Net		Amount		Amortization		Net

Identifiable intangible assets subject to amortization:
Land easements	$	462	$	101	$	361	$	464	$	101	$	363
Capitalized software		787		397		390		787		385		402
Total	$	1,249	$	498	$	751	$	1,251	$	486	$	765

Schedule Of Estimated Aggregate Amortization Expenses


Year	Amortization Expense
2019	$	50
2020		49
2021		49
2022		49
2023		49

Schedule Of Employee Benefit Obligations And Other


	At March 31,		At December 31,
	2019		2018

Retirement plans and other employee benefits	$	1,856	$	1,858
Operating lease liabilities		58		-
Investment tax credits		7		8
Other		91		77
Total employee benefit, operating lease and other obligations	$	2,012	$	1,943

Schedule Of Supplemental Cash Flow Information


	Three Months Ended March 31,
	2019		2018

Cash payments (receipts) related to:
Interest (a)	$	56	$	101
Less capitalized interest		(3)		(2)
Interest payments (net of amounts capitalized)	$	53	$	99
Amount in lieu of income taxes (b):
Federal	$	-	$	(19)

Noncash construction expenditures (c)	$	168	$	125
Noncash increase in operating lease obligations for ROU assets	$	88	$	-

____________

(a)

Excludes March 2019 interest payments that were paid on April 1, 2019.

(b)

See Note 9 for income tax related detail.

(c)

Represents end-of-period accruals.

Business and Significant Accounting Policies (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) segment	Jan. 01, 2019 USD ($)
Business And Significant Accounting Polices [Line Items]
Number of reportable business segments \| segment	0
Operating lease obligations	$ 88
Accounting Standards Update 2016-02 [Member]
Business And Significant Accounting Polices [Line Items]
Operating lease obligations		$ 82
Accounting Standards Update 2018-02 [Member]
Business And Significant Accounting Polices [Line Items]
Reclassification from AOCI to membership interests for stranded tax effects	$ 4
Oncor Holdings [Member]
Business And Significant Accounting Polices [Line Items]
Ownership	80.25%
Texas Transmission [Member]
Business And Significant Accounting Polices [Line Items]
Percentage of membership interest owned by non-controlling owners	19.75%

Business and Significant Accounting Policies (Schedule Of Adoption Of Topic 842) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease ROU assets and other	$ 88
Other current liabilities	28
Employee benefit, operating lease and other obligations	60
Total operating lease liabilities	$ 88
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease ROU assets and other		$ 82
Other current liabilities		26
Employee benefit, operating lease and other obligations		56
Total operating lease liabilities		$ 82

Regulatory Matters (Narrative) (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2019	Dec. 31, 2017	Dec. 31, 2018
Regulatory Matters [Abstract]
U.S. federal statutory rate			21.00%	35.00%
Decrease in revenue requirement					$ 181
Annual rate reductions related to reduction in income taxes		$ 144
Reduction related to amortization of excess deferred income taxes		$ 75
Increase in regulatory liabililty	$ 9

Regulatory Matters (Components Of Regulatory Assets And Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Regulatory Assets And Liabilities [Line Items]
Carrying Amount, Regulatory Assets	$ 1,654	$ 1,691
Carrying Amount, Regulatory Liabilities	2,674	2,697
Net regulatory assets (liabilities)	$ (1,020)	(1,006)
Estimated Net Removal Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Lives of related assets
Carrying Amount, Regulatory Liabilities	$ 1,043	1,023
Excess Deferred Taxes [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Primarily over lives of related assets
Carrying Amount, Regulatory Liabilities	$ 1,554	1,571
Over-Recovered Wholesale Transmission Service Expense [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	1 year or less
Carrying Amount, Regulatory Liabilities	$ 52	89
Other Regulatory Liabilities [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Various
Carrying Amount, Regulatory Liabilities	$ 25	14
Employee Retirement Liability [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	$ 641	648
Employee Retirement Costs Being Amortized [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	9 years
Carrying Amount, Regulatory Assets	$ 288	297
Employee Retirement Costs Incurred Since The Last Rate Review Period [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	$ 75	73
Self-Insurance Reserve (Primarily Storm Recovery Costs) Being Amortized [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	9 years
Carrying Amount, Regulatory Assets	$ 341	351
Self-Insurance Reserve Incurred Since The Last Rate Review Period [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	$ 53	59
Securities Reacquisition Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Lives of related debt
Carrying Amount, Regulatory Assets	$ 10	10
Deferred Conventional Meter And Metering Facilities Depreciation [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	2 years
Carrying Amount, Regulatory Assets	$ 31	36
Under-recovered AMS Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	9 years
Carrying Amount, Regulatory Assets	$ 179	185
Energy Efficiency Performance Bonus [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	1 year or less
Carrying Amount, Regulatory Assets	$ 5	7
Other Regulatory Assets [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Various
Carrying Amount, Regulatory Assets	$ 31	$ 25

Revenues (Narrative) (Details)	3 Months Ended
Revenues (Narrative) (Details)	Mar. 31, 2019 item
Disaggregation of Revenue [Line Items]
Number of REPS	90
REP Subsidiary One [Member] \| Sales Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	23.00%
REP Subsidiary Two [Member] \| Sales Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	19.00%

Revenues (Disaggregation Of Revenues) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	$ 744	$ 726
Revenues collected for pass-through expenses	272	264
Total operating revenues	1,016	990
Distribution Base Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	499	507
Transmission Base Revenues (TCOS Revenues) [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	228	203
Transmission Base Revenues (TCOS Revenues) [Member] \| Third-Party Wholesale Customers [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	143	125
Transmission Base Revenues (TCOS Revenues) [Member] \| REPS Serving Oncor Distribution Customers, Through TCRF [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	85	78
Other Miscellaneous Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	17	16
TCRF - Third-party Wholesale Transmission Service [Member]
Disaggregation of Revenue [Line Items]
Revenues collected for pass-through expenses	260	245
EECRF And Other Regulatory Charges [Member]
Disaggregation of Revenue [Line Items]
Revenues collected for pass-through expenses	$ 12	$ 19

Short-Term Borrowings (Narrative) (Details) $ in Millions	3 Months Ended
Short-Term Borrowings (Narrative) (Details) $ in Millions	Mar. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items]
Borrowing capacity available under the credit facility	$ 2,000	$ 2,000
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Outstanding borrowing under the revolving credit facility	10	9
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2,000
Number of revolving credit facilities extension options \| contract	2
Extension period for revolving line of credit	1 year
Credit facility, term	5 years
Expiration of revolving credit facility	Nov. 01, 2022
Revolving Credit Facility [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Additional increase in borrowing capacity amount	$ 400
Revolving Credit Facility [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Additional increase in borrowing capacity amount	100
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	2,000
Outstanding borrowing under the revolving credit facility	$ 1,141	$ 813
One-Month London Interbank Offered Rate [Member]
Line of Credit Facility [Line Items]
Spread over variable rate	1.00%

Short-Term Borrowings (Schedule Of Short-Term Borrowings) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Total borrowing capacity	$ 2,000	$ 2,000
Available unused credit	849	1,178
Commercial Paper [Member]
Short-term Debt [Line Items]
Outstanding	$ (1,141)	$ (813)
Interest Rate	2.81%	2.74%
Letter of Credit [Member]
Short-term Debt [Line Items]
Outstanding	$ (10)	$ (9)
Interest Rate	1.20%	1.20%
One-Month London Interbank Offered Rate [Member]
Short-term Debt [Line Items]
Spread over variable rate	1.00%

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Long-Term Debt [Line Items]
Estimated fair value of our long-term debt including current maturities	$ 7,343	$ 7,086
Carrying amount	$ 6,435	$ 6,435
One-Month London Interbank Offered Rate [Member]
Long-Term Debt [Line Items]
Spread over variable rate	1.00%
Secured Debt [Member]
Long-Term Debt [Line Items]
Percentage of fair value of cost of property additions certified to the Deed of Trust collateral agent	85.00%
Available bond credits	$ 3,583
Future debt subject to property additions to the Deed of Trust	$ 2,720

Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total long-term debt	$ 6,476	$ 6,476
Unamortized discount and debt issuance costs	(41)	(41)
Less amount due currently	(600)	(600)
Long-term debt, less amounts due currently	5,835	5,835
Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 6,126	6,126
2.15% Fixed Senior Notes Due June 1, 2019 [Member]
Debt Instrument [Line Items]
Interest percentage	2.15%
2.15% Fixed Senior Notes Due June 1, 2019 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 250	$ 250
5.75% Fixed Senior Notes Due September 30, 2020 [Member]
Debt Instrument [Line Items]
Interest percentage	5.75%	5.75%
Due date	Sep. 30, 2020	Sep. 30, 2020
5.75% Fixed Senior Notes Due September 30, 2020 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 126	$ 126
4.10% Fixed Senior Notes Due June 1, 2022 [Member]
Debt Instrument [Line Items]
Interest percentage	4.10%	4.10%
4.10% Fixed Senior Notes Due June 1, 2022 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 400	$ 400
7.00% Fixed Debentures Due September 1, 2022 [Member]
Debt Instrument [Line Items]
Interest percentage	7.00%	7.00%
7.00% Fixed Debentures Due September 1, 2022 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 482	$ 482
2.95% Fixed Senior Notes Due April 1, 2025 [Member]
Debt Instrument [Line Items]
Interest percentage	2.95%	2.95%
2.95% Fixed Senior Notes Due April 1, 2025 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 350	$ 350
3.70% Fixed Senior Notes Due November 15, 2028 [Member]
Debt Instrument [Line Items]
Interest percentage	3.70%	3.70%
3.70% Fixed Senior Notes Due November 15, 2028 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 350	$ 350
5.75% Fixed Senior Notes Due March 15, 2029 [Member]
Debt Instrument [Line Items]
Interest percentage	5.75%	5.75%
Due date	Mar. 15, 2029	Mar. 15, 2029
5.75% Fixed Senior Notes Due March 15, 2029 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 318	$ 318
7.00% Fixed Senior Notes Due May 1, 2032 [Member]
Debt Instrument [Line Items]
Interest percentage	7.00%	7.00%
7.00% Fixed Senior Notes Due May 1, 2032 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 500	$ 500
7.25% Fixed Senior Notes Due January 15, 2033 [Member]
Debt Instrument [Line Items]
Interest percentage	7.25%	7.25%
7.25% Fixed Senior Notes Due January 15, 2033 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 350	$ 350
7.50% Fixed Senior Notes Due September 1, 2038 [Member]
Debt Instrument [Line Items]
Interest percentage	7.50%	7.50%
7.50% Fixed Senior Notes Due September 1, 2038 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 300	$ 300
5.25% Fixed Senior Notes Due September 30, 2040 [Member]
Debt Instrument [Line Items]
Interest percentage	5.25%	5.25%
5.25% Fixed Senior Notes Due September 30, 2040 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 475	$ 475
4.55% Fixed Senior Notes Due December 1, 2041 [Member]
Debt Instrument [Line Items]
Interest percentage	4.55%	4.55%
4.55% Fixed Senior Notes Due December 1, 2041 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 400	$ 400
5.30% Fixed Senior Notes Due June 1, 2042 [Member]
Debt Instrument [Line Items]
Interest percentage	5.30%	5.30%
5.30% Fixed Senior Notes Due June 1, 2042 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 500	$ 500
3.75% Fixed Senior Notes Due April 1, 2045 [Member]
Debt Instrument [Line Items]
Interest percentage	3.75%	3.75%
Due date	Apr. 01, 2045	Apr. 01, 2045
3.75% Fixed Senior Notes Due April 1, 2045 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 550	$ 550
3.80% Fixed Senior Notes Due September 30, 2047 [Member]
Debt Instrument [Line Items]
Interest percentage	3.80%	3.80%
Due date	Sep. 30, 2047	Sep. 30, 2047
3.80% Fixed Senior Notes Due September 30, 2047 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 325	$ 325
4.10% Fixed Senior Notes Due November 15, 2048 [Member]
Debt Instrument [Line Items]
Interest percentage	4.10%	4.10%
Due date	Nov. 15, 2048	Nov. 15, 2048
4.10% Fixed Senior Notes Due November 15, 2048 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 450	$ 450
Term Loan Credit Agreement Maturing December 9, 2019 [Member]
Debt Instrument [Line Items]
Due date	Dec. 09, 2019	Dec. 09, 2019
Term Loan Credit Agreement Maturing December 9, 2019 [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Term loan	$ 350	$ 350

Commitments And Contingencies (Schedule Of Lease Information) (Details) $ in Millions	Mar. 31, 2019 USD ($)
Commitments and Contingencies [Abstract]
Operating lease ROU assets and other	$ 88
Other current liabilities	28
Employee benefit, operating lease and other obligations	60
Total operating lease liabilities	$ 88
Weighted-average remaining lease term (in years)	4 years
Weighted-average discount rate	3.40%

Commitments And Contingencies (Schedule Of Lease Costs) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Commitments and Contingencies [Abstract]
Operating lease costs (including amounts allocated to property, plant and equipment)	$ 10
Short-term lease costs	11
Total operating lease costs	21
Cash paid for amounts included in the measurement of lease liabilities	$ 7

Commitments And Contingencies (Schedule Of Operating Lease Maturity) (Details) $ in Millions	Mar. 31, 2019 USD ($)
Commitments and Contingencies [Abstract]
2019 (remaining nine months)	$ 23
2020	22
2021	20
2022	15
2023	8
Thereafter	6
Total undiscounted lease payments	94
Less imputed interest	(6)
Total future minimum lease payments	$ 88

Commitments And Contingencies (Schedule Of Future Minimum Lease Payments Under Operating Leases) (Details) $ in Millions	Mar. 31, 2019 USD ($)
Commitments and Contingencies [Abstract]
2019	$ 29
2020	22
2021	20
2022	15
2023	8
Thereafter	5
Total future minimum lease payments	$ 99

Membership Interests (Narrative) (Details) - USD ($) $ in Millions			3 Months Ended
	May 01, 2019	Apr. 30, 2019	Mar. 31, 2019
Subsequent Event [Line Items]
Cash available for distribution under the capital structure restriction			$ 160
Regulatory capitalization ratio, debt			57.50%
Regulatory capitalization ratio, equity			42.50%
Current regulatory capitalization ratio, debt			56.70%
Current regulatory capitalization ratio, equity			43.30%
Members contribution			$ 70
Subsequent Event [Member]
Subsequent Event [Line Items]
Members contribution		$ 70
Contingent equity distribution	$ 71

Membership Interests (Schedule Of Changes To Membership Interests) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance	$ 8,460
Net income	116	$ 89
Distributions	(71)
Capital contributions	70
Net effects of cash flow hedges (Note 1)	(4)
Defined benefit pension plans	1	1
Balance	8,576
Capital Accounts [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance	8,624	8,004
Net income	116	89
Distributions	(71)
Capital contributions	70
Net effects of cash flow hedges (Note 1)	4
Defined benefit pension plans
Balance	8,743	8,093
Accumulated Other Comprehensive Income (Loss) [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance	(164)	(101)
Net income
Distributions
Capital contributions
Net effects of cash flow hedges (Note 1)	(4)
Defined benefit pension plans	1	1
Balance	(167)	(100)
Membership Interests [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance	8,460	7,903
Net income	116	89
Distributions	(71)
Capital contributions	70
Net effects of cash flow hedges (Note 1)
Defined benefit pension plans	1	1
Balance	$ 8,576	$ 7,993

Membership Interests (Schedule Of Changes To Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (164)
Balance at end of period	(167)
Cash Flow Hedges - Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(16)	$ (18)
Defined benefit pension plans
Amounts reclassified from accumulated other comprehensive income (loss) to the capital account (Note 1)	(4)
Balance at end of period	(20)	(18)
Defined Benefit Pension and OPEB Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(148)	(83)
Defined benefit pension plans	1	1
Amounts reclassified from accumulated other comprehensive income (loss) to the capital account (Note 1)
Balance at end of period	(147)	(82)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(164)	(101)
Defined benefit pension plans	1	1
Amounts reclassified from accumulated other comprehensive income (loss) to the capital account (Note 1)	(4)
Balance at end of period	$ (167)	$ (100)

Pension and OPEB Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Regulatory assets	$ 1,654		$ 1,691
Oncor Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.16%
Expected return on plan assets	5.43%
Vistra Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.40%
Expected return on plan assets	5.29%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets	$ 30	$ 30
Amortization of net loss	(7)	(12)
Cash contributions	1
Additional cash contributions	40
Additional cash contributions, next five years	538
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets	2	2
Amortization of net loss	(4)	(14)
Amortization of prior service cost	$ (5)	$ (7)
Discount rate	4.41%
Expected return on plan assets	6.19%
Cash contributions	$ 9
Additional cash contributions	26
Additional cash contributions, next five years	$ 179

Pension and OPEB Plans (Schedule Of Pension And OPEB Plan Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Net costs	$ 26	$ 37
Less amounts deferred principally as property or a regulatory asset	(7)	(18)
Net amounts recognized as expense	19	19
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	7
Interest cost	32	30
Expected return on assets	(30)	(30)
Amortization of net loss	7	12
Net costs	16	19
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2
Interest cost	11	11
Expected return on assets	(2)	(2)
Amortization of prior service cost	(5)	(7)
Amortization of net loss	4	14
Net costs	$ 10	$ 18

Related-Party Transactions (Narrative) (Details) - USD ($)		3 Months Ended
	Mar. 08, 2018	Mar. 31, 2019	Mar. 31, 2018
Related Party Transaction [Line Items]
Transformer maintenance revenue		$ 1,016,000,000	$ 990,000,000
Tax related payments (received from)		0	0
Wholesale transmission service		260,000,000	$ 245,000,000
EFH Corp [Member]
Related Party Transaction [Line Items]
Tax related payments (received from)		$ 19,000,000
Sponsor Group [Member]
Related Party Transaction [Line Items]
Equity in existing vendor	16.00%
Cash payments to vendors	$ 35,000,000
Sponsor Group [Member] \| Capitalized [Member]
Related Party Transaction [Line Items]
Cash payments to vendors	33,000,000
Sponsor Group [Member] \| Operation And Maintenance Expense [Member]
Related Party Transaction [Line Items]
Cash payments to vendors	$ 2,000,000

Related-Party Transactions (Schedule Of Trade Accounts And Other Receivables From Related Parties) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Texas margin taxes payable	$ 39	$ 26
Net payable (receivable)	39	26
Texas [Member]
Related Party Transaction [Line Items]
Texas margin taxes payable	27	21
Federal [Member]
Related Party Transaction [Line Items]
Federal income taxes payable (receivable)	12	5
Sempra Texas Holdings [Member]
Related Party Transaction [Line Items]
Net payable (receivable)	37
Sempra Texas Holdings [Member] \| Texas [Member]
Related Party Transaction [Line Items]
Texas margin taxes payable	27
Sempra Texas Holdings [Member] \| Federal [Member]
Related Party Transaction [Line Items]
Federal income taxes payable (receivable)	10
EFH Corp [Member]
Related Party Transaction [Line Items]
Net payable (receivable)		25
EFH Corp [Member] \| Texas [Member]
Related Party Transaction [Line Items]
Texas margin taxes payable		21
EFH Corp [Member] \| Federal [Member]
Related Party Transaction [Line Items]
Federal income taxes payable (receivable)		4
Texas Transmission Investment LLC [Member]
Related Party Transaction [Line Items]
Net payable (receivable)	2	1
Texas Transmission Investment LLC [Member] \| Federal [Member]
Related Party Transaction [Line Items]
Federal income taxes payable (receivable)	$ 2	$ 1

Supplementary Financial Information (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Supplemental Financial Information [Line Items]
Aggregate amortization expenses	$ 13	$ 12
Goodwill	$ 4,064		$ 4,064
Trade Accounts Receivable [Member] \| Nonaffiliated REP [Member]
Supplemental Financial Information [Line Items]
Concentration risk percentage	14.00%		13.00%
Trade Accounts Receivable [Member] \| Second Nonaffiliated REP [Member]
Supplemental Financial Information [Line Items]
Concentration risk percentage	12.00%		10.00%

Supplementary Financial Information (Schedule Of Other Income And (Deductions)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Supplementary Financial Information [Abstract]
Professional fees	$ (3)	$ (3)
Sempra Acquisition related costs		(16)
Recoverable pension and OPEB - non-service costs	(14)	(13)
Total other income and (deductions) - net	$ (17)	$ (32)

Supplementary Financial Information (Schedule Of Interest Expense And Related Charges) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Supplementary Financial Information [Abstract]
Interest	$ 88	$ 89
Amortization of debt issuance costs and discounts	1	1
Less allowance for funds used during construction — capitalized interest portion	(3)	(2)
Total interest expense and related charges	$ 86	$ 88

Supplementary Financial Information (Schedule Of Trade Accounts And Other Receivables) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Supplementary Financial Information [Abstract]
Gross trade accounts and other receivables	$ 596	$ 562
Allowance for uncollectible accounts	(4)	(3)
Trade accounts receivable - net	$ 592	$ 559

Supplementary Financial Information (Summary of Investments And Other Property) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Supplementary Financial Information [Abstract]
Assets related to employee benefit plans, including employee savings programs	$ 107	$ 108
Land	12	12
Total investments and other property	$ 119	$ 120

Supplementary Financial Information (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Property Plant and Equipment [Line Items]
Total assets in service	$ 23,393	$ 23,170
Less accumulated depreciation and amortization	7,594	7,513
Net of accumulated depreciation and amortization	15,799	15,657
Construction work in progress	639	417
Held for future use	17	16
Property, plant and equipment - net	16,455	16,090
Distribution [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 13,295	13,105
Composite depreciation rate	2.80%
Avg. life	35 years 2 months 12 days
Transmission [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 8,609	8,568
Composite depreciation rate	2.90%
Avg. life	34 years 4 months 24 days
Other Assets [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 1,489	$ 1,497
Composite depreciation rate	6.90%
Avg. life	14 years 7 months 6 days

Supplementary Financial Information (Schedule Of Intangible Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,249	$ 1,251
Accumulated Amortization	498	486
Net	751	765
Land Easements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	462	464
Accumulated Amortization	101	101
Net	361	363
Capitalized Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	787	787
Accumulated Amortization	397	385
Net	$ 390	$ 402

Supplementary Financial Information (Schedule Of Estimated Aggregate Amortization Expenses) (Details) $ in Millions	Mar. 31, 2019 USD ($)
Supplementary Financial Information [Abstract]
2019	$ 50
2020	49
2021	49
2022	49
2023	$ 49

Supplementary Financial Information (Schedule Of Employee Benefit Obligations And Other) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Supplementary Financial Information [Abstract]
Retirement plans and other employee benefits	$ 1,856	$ 1,858
Operating lease liabilities	58
Investment tax credits	7	8
Other	91	77
Total employee benefit obligations and other	$ 2,012	$ 1,943

Supplementary Financial Information (Schedule Of Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Supplementary Financial Information [Abstract]
Interest	$ 56	$ 101
Less capitalized interest	(3)	(2)
Interest payments (net of amounts capitalized)	53	99
Federal		(19)
Noncash construction expenditures	168	$ 125
Noncash increase in operating lease obligations for ROU assets	$ 88

Pending Infrareit Acquisition (Narrative) (Details) - InfraREIT [Member] - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Oct. 18, 2018	Mar. 31, 2019
Business Acquisition [Line Items]
Price per share of common stock to stockholders and limited partners	$ 21.00
Purchase price	$ 1,275.0
Management agreement termination fee	$ 40.5
Outstanding debt acquired		$ 946.0
Partner capital contribution for business combination		$ 1,330.0