Oncor Electric Delivery 10-Q 5 Aug 21 2021 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Aug. 05, 2021	Dec. 31, 2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	333-100240
Entity Registrant Name	Oncor Electric Delivery Company LLC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	75-2967830
Entity Address, Address Line One	1616 Woodall Rodgers Fwy.
Entity Address, City or Town	Dallas
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75202
City Area Code	214
Local Phone Number	486-2000
Title of 12(b) Security	None
No Trading Symbol Flag	true
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Capital account, interests outstanding	635,000,000	635,000,000	635,000,000
Entity Common Stock, Shares Outstanding		0
Entity Central Index Key	0001193311
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Oncor Electric Delivery Holdings Company LLC [Member]
Entity Outstanding Membership Interests		80.25%
Texas Transmission and Investment LLC [Member]
Entity Outstanding Membership Interests		19.75%

Condensed Statements Of Consoli

Condensed Statements Of Consolidated Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Condensed Statements Of Consolidated Income [Abstract]
Operating revenues (Note 3)	$ 1,147	$ 1,090	$ 2,286	$ 2,162
Operating expenses:
Wholesale transmission service	260	233	509	478
Operation and maintenance	232	212	467	444
Depreciation and amortization	209	196	414	389
Provision in lieu of income taxes (Notes 9)	36	38	72	67
Taxes other than amounts related to income taxes	135	126	275	257
Total operating expenses	872	805	1,737	1,635
Operating income	275	285	549	527
Other deductions and (income) - net (Note 10)	7	10	14	23
Nonoperating benefit in lieu of income taxes	(3)	(3)	(6)	(6)
Interest expense and related charges (Note 10)	102	102	204	203
Net income	$ 169	$ 176	$ 337	$ 307

Condensed Statements Of Conso_2

Condensed Statements Of Consolidated Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Condensed Statements Of Consolidated Comprehensive Income [Abstract]
Net income	$ 169	$ 176	$ 337	$ 307
Other comprehensive income (loss):
Net effects of cash flow hedges (net of tax)			1	(23)
Defined benefit pension plans (net of tax)	3	2	4	3
Total other comprehensive income (loss)	3	2	5	(20)
Comprehensive income	$ 172	$ 178	$ 342	$ 287

Condensed Statements Of Conso_3

Condensed Statements Of Consolidated Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows - operating activities:
Net income	$ 337	$ 307
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization, including regulatory amortization	454	429
Provision in lieu of deferred income taxes - net	37	14
Other - net	1	(1)
Changes in operating assets and liabilities:
Regulatory accounts related to reconcilable tariffs (Note 2)	(61)	(7)
Other operating assets and liabilities	(245)	(153)
Cash provided by operating activities	523	589
Cash flows - financing activities:
Issuances of long-term debt (Note 5)	770	1,265
Repayment of long-term debt (Note 5)		(465)
Net change in short-term borrowings (Note 4)	(63)	(39)
Capital contributions from members (Note 7)	125	174
Distributions to members (Note 7)	(192)	(183)
Debt discount and financing costs - net	(2)	(35)
Cash provided by financing activities	638	717
Cash flows - investing activities:
Capital expenditures	(1,224)	(1,283)
Expenditures for third party in joint project (Note 3)	(65)	(27)
Reimbursement from third party in joint project (Note 3)	91	13
Other - net	17	11
Cash used in investing activities	(1,181)	(1,286)
Net change in cash and cash equivalents	(20)	20
Cash and cash equivalents - beginning balance	27	4
Cash and cash equivalents - ending balance	$ 7	$ 24

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 7	$ 27
Trade accounts receivable – net (Note 10)	765	760
Amounts receivable from members related to income taxes (Note 9)	22	7
Materials and supplies inventories - at average cost	149	144
Prepayments and other current assets	99	100
Total current assets	1,042	1,038
Investments and other property (Note 10)	149	142
Property, plant and equipment - net (Note 10)	21,998	21,225
Goodwill (Note 1)	4,740	4,740
Regulatory assets (Note 2)	1,898	1,779
Operating lease ROU, third-party joint project and other assets (Notes 3 and 6)	168	248
Total assets	29,995	29,172
Current liabilities:
Short-term borrowings (Note 4)	7	70
Long-term debt due currently (Note 5)	1,150
Trade accounts payable	355	392
Amounts payable to members related to income taxes (Note 9)	14	23
Accrued taxes other than amounts related to income taxes	176	269
Accrued interest	86	87
Operating lease and other current liabilities (Note 6)	276	279
Total current liabilities	2,064	1,120
Long-term debt, less amounts due currently (Note 5)	8,853	9,229
Liability in lieu of deferred income taxes (Note 9)	1,997	1,923
Regulatory liabilities (Note 2)	2,856	2,855
Employee benefit obligations (Note 8)	1,792	1,808
Operating lease, third-party joint project and other obligations (Notes 3, 6 and 10)	226	305
Total liabilities	17,788	17,240
Commitments and contingencies (Note 6)
Membership interests (Note 7):
Capital account ― number of interests outstanding 2021 and 2020 – 635,000,000	12,353	12,083
Accumulated other comprehensive loss	(146)	(151)
Total membership interests	12,207	11,932
Total liabilities and membership interests	$ 29,995	$ 29,172

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - shares	Aug. 05, 2021	Jun. 30, 2021	Dec. 31, 2020
Condensed Consolidated Balance Sheets [Abstract]
Capital account, interests outstanding	635,000,000	635,000,000	635,000,000

Business And Significant Accoun

Business And Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
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 as apparent in the context. See “Glossary” for the 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, western and panhandle regions of Texas. We are a direct, majority-owned subsidiary of Oncor Holdings, which is indirectly and wholly owned by Sempra. Oncor Holdings owns 80.25 % of our outstanding membership interests and Texas Transmission owns 19.75 % of our outstanding membership interests. We are managed as an integrated business; consequently, there is only one reportable segment. Ring-Fencing Measures Since 2007, various ring-fencing measures have been taken to enhance our credit quality and the separateness between the Oncor Ring-Fenced Entities and entities with ownership interests in Oncor or Oncor Holdings. These ring-fencing measures serve to mitigate the Oncor Ring-Fenced Entities’ credit exposure to 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 direct or indirect owners of Oncor and Oncor Holdings in connection with a bankruptcy of any such entities. These measures include the November 2008 sale of 19.75 % of Oncor’s equity interests to Texas Transmission. In March 2018, Sempra indirectly acquired Oncor Holdings after obtaining the approval of the PUCT. The PUCT approval was obtained in Docket No. 47675, and the final order issued in that docket (Sempra Acquisition PUCT Order) outlines certain ring-fencing measures, governance mechanisms and restrictions that apply after the acquisition. As a result of these ring-fencing measures, Sempra does not control Oncor, and the ring-fencing measures limit Sempra’s ability to direct the management, policies and operations of Oncor, including the deployment or disposition of Oncor’s assets, declarations of dividends, strategic planning and other important corporate issues and actions. 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. Oncor is a limited liability company governed by a board of directors, not its members. The Sempra Acquisition PUCT Order and our Limited Liability Company Agreement require that the board of directors of Oncor consist of thirteen members, constituted as follows:  seven Disinterested Directors, who (i) shall be independent directors in all material respects under the rules of the New York Stock Exchange in relation to Sempra or its subsidiaries and affiliated entities and any entity with a direct or indirect ownership interest in Oncor or Oncor Holdings, and (ii) shall have no material relationship with Sempra or its subsidiaries or affiliated entities or any entity with a direct or indirect ownership interest in Oncor or Oncor Holdings, currently or within the previous ten years ;  two members designated by Sempra (through Oncor Holdings);  two members designated by Texas Transmission; and  two current or former officers of Oncor (the Oncor Officer Directors), currently Robert S. Shapard and E. Allen Nye, Jr., who are our Chairman of the Board and Chief Executive, respectively. Until March 9, 2028, in order for a current or former officer of Oncor to be eligible to serve as an Oncor Officer Director, the officer cannot have worked for Sempra or any of its affiliates (excluding Oncor Holdings and Oncor) or any other entity with a direct or indirect ownership interest in Oncor or Oncor Holdings in the ten-year period prior to serving as an Oncor Officer Director. Oncor Holdings, at the direction of STIH, has the right to nominate and/or seek the removal of the Oncor Officer Directors, subject to approval by a majority of the Oncor board of directors. STIH is a wholly owned indirect subsidiary of, and controlled by, Sempra. In addition, the Sempra Acquisition PUCT Order provides that Oncor’s board of directors cannot be overruled by the board of Sempra or any of its subsidiaries on dividend policy, the issuance of dividends or other distributions (except for contractual tax payments), debt issuance, capital expenditures, operation and maintenance expenditures, management and service fees, and appointment or removal of board members, provided that certain actions may also require the additional approval of the Oncor Holdings board of directors. The Sempra Acquisition PUCT Order also provides that any changes to the size, composition, structure or rights of the board must first be approved by the PUCT. In addition, if Sempra acquires Texas Transmission’s interest in Oncor, the two board positions on Oncor’s board of directors that Texas Transmission is entitled to appoint will be eliminated and the size of Oncor’s board of directors will be reduced by two. Additional regulatory commitments, governance mechanisms and restrictions provided in the Sempra Acquisition PUCT Order and our Limited Liability Company Agreement to ring-fence Oncor from its owners include, among others:  A majority of the Disinterested Directors of Oncor and the directors designated by Texas Transmission that are present and voting (of which at least one must be present and voting) must approve any annual or multi-year budget if the aggregate amount of capital expenditures or operating and maintenance expenditures in such budget is more than a 10 % increase or decrease from the corresponding amounts of such expenditures in the budget for the preceding fiscal year or multi-year period, as applicable;  Oncor may not pay any dividends or make any other distributions (except for contractual tax payments) if a majority of its Disinterested Directors or either of the two directors appointed by Texas Transmission determines that it is in the best interests of Oncor to retain such amounts to meet expected future requirements;  At all times, Oncor will remain in compliance with the debt-to-equity ratio established by the PUCT from time to time for ratemaking purposes, and Oncor will not pay dividends or other distributions (except for contractual tax payments), if that payment would cause its debt-to-equity ratio to exceed the debt-to-equity ratio approved by the PUCT;  If the credit rating on Oncor’s senior secured debt by any of the three major rating agencies falls below BBB (or the equivalent), Oncor will suspend dividends and other distributions (except for contractual tax payments), unless otherwise allowed by the PUCT;  Without the prior approval of the PUCT, neither Sempra nor any of its affiliates (excluding Oncor) will incur, guaranty or pledge assets in respect of any indebtedness that is dependent on the revenues of Oncor in more than a proportionate degree than the other revenues of Sempra or on the membership interests of Oncor, and there will be no debt at STH or STIH at any time following Sempra’s acquisition of Oncor Holdings;  Neither Oncor nor Oncor Holdings will lend money to or borrow money from Sempra or any of its affiliates (other than Oncor subsidiaries), or any entity with a direct or indirect ownership interest in Oncor or Oncor Holdings, and neither Oncor nor Oncor Holdings will share credit facilities with Sempra or any of its affiliates (other than Oncor subsidiaries), or any entity with a direct or indirect ownership interest in Oncor or Oncor Holdings;  There must be maintained certain “separateness measures” that reinforce the legal and financial separation of Oncor from its owners, including a requirement that dealings between Oncor, Oncor Holdings and their subsidiaries with Sempra, any of Sempra’s other affiliates or any entity with a direct or indirect ownership interest in Oncor or Oncor Holdings, must be on an arm’s-length basis, limitations on affiliate transactions, separate recordkeeping requirements and a prohibition on Sempra or its affiliates pledging Oncor assets or membership interests for any entity other than Oncor; and  Sempra will continue to hold indirectly at least 51 % of the ownership interests in Oncor and Oncor Holdings for at least five years following Sempra’s March 2018 acquisition of Oncor Holdings, unless otherwise specifically authorized by the PUCT. Basis of Presentation These unaudited condensed consolidated financial statements should be read in conjunction with the audited financial statements and related notes included in our 2020 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 appropriate 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 12 to Financial Statements in our 2020 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. Interest Rate Derivatives and Hedge Accounting We are exposed to interest rates primarily as a result of our current and expected use of financing. We may, from time to time, utilize interest rate derivative instruments typically designated as cash flow hedges, to lock in interest rates in anticipation of future financings. We may designate an interest rate derivative instrument as a cash flow hedge if it effectively converts anticipated cash flows associated with interest payments to a fixed dollar amount. In accounting for cash flow hedges, derivative assets and liabilities are recorded on the balance sheet at fair value with an offset to other comprehensive income. Amounts remain in accumulated other comprehensive income and are reclassified into net income as the interest expense on the related debt affects net income. Impairment of Long-Lived Assets and Goodwill We evaluate long-lived assets (including intangible assets with finite lives) for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. We also evaluate goodwill for impairment annually on October 1 and whenever events or changes in circumstances indicate that an impairment may exist. The determination of the existence of these and other indications of impairment involves judgments that are subjective in nature and may require the use of estimates in forecasting future results and cash flows. Effects of Reference Rate Reform on Financial Reporting Our Credit Facility and term loan credit agreements use LIBOR as a benchmark for establishing interest rates. In the event we modify our Credit Facility or term loan credit agreements related to the phase-out of LIBOR, we will evaluate the optional expedients and exceptions under ASU No. 2020-04. The standard allows entities to account for contract modifications as an event that does not require reassessment or remeasurement (i.e., as a continuation of the existing contract).

Regulatory Matters

Regulatory Matters	6 Months Ended
	Jun. 30, 2021
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 June 30, 2021 are provided in the table below. Amounts not currently earning a return through rate regulation are noted. Remaining Rate Recovery/Amortization Period At June 30, 2021 At June 30, 2021 At December 31, 2020 Regulatory assets: Employee retirement liability (a)(b)(c) To be determined $ 648 $ 672 Employee retirement costs being amortized 7 years 209 227 Employee retirement costs incurred since the last rate review period (b) To be determined 94 67 Self-insurance reserve (primarily storm recovery costs) being amortized 7 years 245 266 Self-insurance reserve incurred since the last rate review period (primarily storm related) (b) To be determined 368 256 Debt reacquisition costs Lives of related debt 22 25 Under-recovered AMS costs 7 years 138 149 Energy efficiency performance bonus (a) 1 year or less 7 14 Wholesale distribution substation service To be determined 65 55 Unrecovered expenses related to COVID-19 To be determined 32 27 Under-recovered wholesale transmission service expense (a) 1 year or less 32 - Other regulatory assets Various 38 21 Total regulatory assets 1,898 1,779 Regulatory liabilities: Estimated net removal costs Lives of related assets 1,314 1,262 Excess deferred taxes Primarily over lives of related assets 1,475 1,508 Over-recovered wholesale transmission service expense (a) 1 year or less - 52 Unamortized gain on reacquisition of debt Lives of related debt 26 27 Employee retirement costs over-recovered since last rate review period (b) To be determined 30 - Other regulatory liabilities Various 11 6 Total regulatory liabilities 2,856 2,855 Net regulatory assets (liabilities) $ ( 958 ) $ ( 1,076 ) ____________ (a) Not earning a return in the regulatory rate-setting process. (b) Recovery/refund 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. PUCT Project No. 50664, Issues Related to the State of Disaster for the Coronavirus Disease 2019 In March 2020, the PUCT issued an order in PUCT Project No. 50664, Issues Related to the State of Disaster for the Coronavirus Disease 2019, authorizing transmission and distribution utilities to use a regulatory asset accounting mechanism and a subsequent process to seek future recovery of expenses resulting from the effects of the COVID-19 pandemic. Since then, we have been recording incremental costs incurred by Oncor resulting from the effects of the COVID-19 pandemic, including costs relating to the implementation of our pandemic response plan, as a regulatory asset. At June 30, 2021, we recorded $ 32 million with respect to this regulatory asset. See Note 2 to Financial Statements in our 2020 Form 10-K for additional information regarding the unrecovered expenses related to COVID-19.

Revenues

Revenues	6 Months Ended
	Jun. 30, 2021
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-approved 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: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Operating revenues Revenues contributing to earnings: Distribution base revenues $ 517 $ 519 $ 1,058 $ 1,014 Transmission base revenues (TCOS revenues): Billed to third-party wholesale customers 222 200 429 395 Billed to REPs serving Oncor distribution customers, through TCRF 120 111 234 221 Total transmission base revenues 342 311 663 616 Other miscellaneous revenues 19 18 36 34 Total revenues contributing to earnings 878 848 1,757 1,664 Revenues collected for pass-through expenses: TCRF – third-party wholesale transmission service 260 233 509 478 EECRF 9 9 20 20 Total revenues collected for pass-through expenses 269 242 529 498 Total operating revenues $ 1,147 $ 1,090 $ 2,286 $ 2,162 Customers Our distribution customers consist of REPs (approximately 85 REPs at June 30, 2021) 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 benefiting from our transmission system. Our transmission customers consist of other distribution companies, municipalities and electric cooperatives. REP subsidiaries of our two largest customers collectively represented 21 % and 19 % of our total operating revenues for the three months ended June 30, 2021 and 24 % and 22 % of our total operating revenues for the six months ended June 30, 2021. No other customer represented more than 10% of our total operating revenues in 2021. 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 of customer billings 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 REPs are recoverable as a regulatory asset. Pass-through Expenses Revenue equal to expenses that are allowed to be passed-through to customers (primarily third-party wholesale transmission service and energy efficiency program costs) are recognized at the time the expense is recognized. 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. Joint Project with LP&L In the second quarter of 2021, Oncor completed an approximately $ 370 million joint project with LP&L. The project involved the build out of approximately 175 miles of transmission lines and associated station work in the Lubbock and surrounding Texas panhandle areas to join the City of Lubbock to the ERCOT market, with the resulting assets split between Oncor and LP&L . Oncor constructed the facilities and LP&L reimbursed Oncor and received title for its portion of the assets. The LP&L related assets and a corresponding liability were removed from Oncor’s balance sheet at the end of the project when title to the LP&L portion of the assets was transferred to LP&L. As a unique and nonrecurring construction project, the transfer of title was accounted for as a sale of nonfinancial assets at cost.

Short-Term Borrowings

Short-Term Borrowings	6 Months Ended
	Jun. 30, 2021
Short-Term Borrowings [Abstract]
SHORT-TERM BORROWINGS	4. SHORT-TERM BORROWINGS At June 30, 2021 and December 31, 2020, outstanding short-term borrowings under our CP Program and Credit Facility consisted of the following: At June 30, At December 31, 2021 2020 Total credit facility borrowing capacity $ 2,000 $ 2,000 Commercial paper outstanding (a) ( 7 ) ( 70 ) Credit facility outstanding (b) - - Letters of credit outstanding (c) ( 8 ) ( 9 ) Available unused credit $ 1,985 $ 1,921 ____________ (a) The weighted average interest rates for commercial paper were 0.12% at June 30, 2021 and 0.17 % at December 31, 2020. (b) At June 30, 2021, the applicable interest rate for any outstanding borrowings was LIBOR plus 1.25 %. (c) Interest rates on outstanding letters of credit were 1.45 % at both June 30, 2021 and December 31, 2020, based on our credit ratings. CP Program In March 2018, we established the CP Program, under which we may issue CP 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 CP 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. We may utilize either the CP Program or the Credit Facility, at our option, to meet our funding needs. Credit Facility In November 2017, we entered into a $ 2.0 billion unsecured Credit Facility to be used for working capital and general corporate purposes, issuances of letters of credit and to support our CP Program . 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. In November 2020, we entered into an amendment to the Credit Facility that extends its maturity date to November 2023. The Credit Facility also gives us the option of requesting up to two 1 -year extensions, with such extensions subject to certain conditions and lender approvals.

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2021
Long-Term Debt [Abstract]
LONG-TERM DEBT	5. LONG-TERM DEBT Our secured debt is 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 June 30, 2021 and December 31, 2020, our long-term debt consisted of the following: At June 30, At December 31, 2021 2020 Fixed Rate Secured: 4.10 % Senior Notes due June 1, 2022 $ 400 $ 400 7.00 % Debentures due September 1, 2022 482 482 2.75 % Senior Notes due June 1, 2024 500 500 2.95 % Senior Notes due April 1, 2025 350 350 0.55 % Senior Notes due October 1, 2025 450 450 3.86 % Senior Notes Series A, due December 3, 2025 174 174 3.86 % Senior Notes Series B, due January 14, 2026 38 38 3.70 % Senior Notes due November 15, 2028 650 650 5.75 % Senior Notes due March 15, 2029 318 318 2.75 % Senior Notes due May 15, 2030 400 400 7.00 % Senior Notes due May 1, 2032 494 494 7.25 % Senior Notes due January 15, 2033 323 323 7.50 % Senior Notes due September 1, 2038 300 300 5.25 % Senior Notes due September 30, 2040 475 475 4.55 % Senior Notes due December 1, 2041 400 400 5.30 % Senior Notes due June 1, 2042 348 348 3.75 % Senior Notes due April 1, 2045 550 550 3.80 % Senior Notes due September 30, 2047 325 325 4.10 % Senior Notes due November 15, 2048 450 450 3.80 % Senior Notes due June 1, 2049 500 500 3.10 % Senior Notes due September 15, 2049 700 700 3.70 % Senior Notes due May 15, 2050 400 400 5.35 % Senior Notes due October 1, 2052 300 300 Secured long-term debt 9,327 9,327 Variable Rate Unsecured: Term loan credit agreement maturing February 28, 2022 300 - Term loan credit agreement maturing May 17, 2022 450 - Term loan credit agreement maturing August 15, 2022 20 - Total long-term debt 10,097 9,327 Unamortized discount and debt issuance costs ( 94 ) ( 98 ) Less amount due currently ( 1,150 ) - Long-term debt, less amounts due currently $ 8,853 $ 9,229 Long-Term Debt-Related Activity in 2021 January 2021 Term Loan Credit Agreement On January 29, 2021, we entered into an unsecured term loan credit agreement with a commitment equal to an aggregate principal amount of $ 300 million (January 2021 Term Loan Credit Agreement) that matures on February 28, 2022. We borrowed $ 160 million on January 29, 2021 and $ 140 million on February 26, 2021 under the January 2021 Term Loan Credit Agreement. At June 30, 2021, aggregate borrowings under the January 2021 Term Loan Credit Agreement totaled $ 300 million, the full amount available under the agreement. The proceeds from each borrowing were used for general corporate purposes. Loans under the January 2021 Term Loan Credit Agreement bear interest at per annum rates equal to, at our option, (i) LIBOR plus 0.675 %, or (ii) an alternate base rate (the highest of (1) the prime rate of U.S. Bank National Association (U.S. Bank), the lender under the agreement, (2) the federal funds effective rate plus 0.50 %, and (3) daily 1-month LIBOR plus 1 %). Ma rch 2021 Term Loan Credit Agreement On March 17, 2021, we entered into an unsecured term loan credit agreement with a commitment equal to an aggregate principal amount of $ 450 million (March 2021 Term Loan Credit Agreement) that matures on May 17, 2022. We borrowed $ 170 million on March 31, 2021, $105 million on April 30, 2021 and $175 million on May 14, 2021 under the March 2021 Term Loan Credit Agreement. At June 30, 2021, aggregate borrowings under the March 2021 Term Loan Credit Agreement totaled $ 450 million, the full amount available under the agreement. The proceeds from each borrowing were used for general corporate purposes. Loans under the March 2021 Term Loan Credit Agreement bear interest at per annum rates equal to, at our option, (i) LIBOR plus 0.65 %, or (ii) an alternate base rate (the highest of (1) the prime rate of Wells Fargo Bank, National Association (Wells Fargo), the administrative agent and a lender under the agreement, (2) the federal funds effective rate plus 0.50 %, and (3) daily 1-month LIBOR plus 1 %). June 2021 Term Loan Credit Agreement On June 25, 2021, we entered into an unsecured term loan credit agreement with a commitment equal to an aggregate principal amount of $ 540 million (June 2021 Term Loan Credit Agreement) that matures on August 15, 2022. The June 2021 Term Loan Credit Agreement provides that we may borrow the full amount in up to four borrowings, which may be made, at our option, at any time before August 30, 2021. On June 29, 2021, we made our first borrowing under the June 2021 Term Loan Credit Agreement in the amount of $ 20 million . At June 30, 2021, borrowings under the June 2021 Term Loan Credit Agreement totaled $20 million. The proceeds from the borrowing were used for general corporate purposes. Loans under the June 2021 Term Loan Credit Agreement bear interest at per annum rates equal to, at our option, (i) LIBOR plus 0.60 %, or (ii) an alternate base rate (the highest of (1) the prime rate of Sumitomo Mitsui Banking Corporation (Sumitomo), the administrative agent and a lender under the agreement, (2) the federal funds effective rate plus 0.50 %, and (3) daily 1-month LIBOR plus 1 %). Deed of Trust Our secured debt is secured equally and ratably by a first priority lien on certain Oncor transmission and distribution assets. The property is mortgaged under the Deed of Trust. The Deed of Trust permits us to secure indebtedness 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 June 30, 2021, the amount of available bond credits was $ 2.114 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 $ 4.393 billion . Borrowings under the CP Program, the Credit Facility, and our term loan credit agreements are not secured. Fair Value of Long-Term Debt At June 30, 2021 and December 31, 2020, the estimated fair value of our long-term debt (including current maturities) totaled $ 11.935 billion and $ 11.638 billion, respectively, and the carrying amount totaled $ 10.003 billion and $ 9.229 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

Commitments And Contingencies	6 Months Ended
	Jun. 30, 2021
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 above and Note 7 to Financial Statements in our 2020 Form 10-K for additional information regarding our regulatory and legal proceedings, respectively. Leases 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. See Note 7 to Financial Statements in our 2020 Form 10-K for additional information on leases.

Membership Interests

Membership Interests	6 Months Ended
	Jun. 30, 2021
Membership Interests [Abstract]
MEMBERSHIP INTERESTS	7. MEMBERSHIP INTERESTS Contributions We received $ 62 million cash capital contributions from our members on July 27, 2021. In the six months ended June 30, 2021, we received the following cash capital contributions from our members: Receipt Date Amount February 16, 2021 $ 63 April 27, 2021 63 Distributions The Sempra Acquisition PUCT Order and our Limited Liability Company Agreement set forth various restrictions on distributions to our members. Among those restrictions is the commitment that we will make no distributions (other than contractual tax payments) to our members that would cause us to exceed the PUCT’s authorized debt-to-equity ratio. Our current authorized regulatory capital structure is 57.5 % debt to 42.5 % equity. The distribution restrictions also include the ability of a majority of our Disinterested Directors, or either of the two member directors designated by Texas Transmission, to limit distributions to the extent each determines it is necessary to meet expected future requirements of Oncor (including continuing compliance with the PUCT debt-to-equity ratio commitment). At June 30, 2021, our regulatory capitalization was 54.0 % debt to 46.0 % equity and as a result we had $ 1.123 billion available to distribute to our members. 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 any 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 accumulated other comprehensive loss and the effects of acquisition accounting from a 2007 transaction. On July 28, 2021, our board of directors declared a cash distribution of $ 546 million, which was paid to our members on July 29, 2021. In the six months ended June 30, 2021, our board of directors declared, and we paid, the following cash distributions to our members: Declaration Date Payment Date Amount February 17, 2021 February 18, 2021 $ 96 April 28, 2021 April 29, 2021 96 Membership Interests The following tables present the changes to membership interests during the three and six months ended June 30, 2021 and 2020, net of tax: Capital Accounts Accumulated Other Comprehensive Income (Loss) Total Membership Interests Balance at March 31, 2021 $ 12,218 $ ( 149 ) $ 12,069 Net income 169 - 169 Capital contributions 62 - 62 Distributions ( 96 ) - ( 96 ) Defined benefit pension plans - 3 3 Balance at June 30, 2021 $ 12,353 $ ( 146 ) $ 12,207 Balance at March 31, 2020 $ 11,065 $ ( 161 ) $ 10,904 Net income 176 - 176 Capital contributions 87 - 87 Distributions ( 92 ) - ( 92 ) Defined benefit pension plans - 2 2 Balance at June 30, 2020 $ 11,236 $ ( 159 ) $ 11,077 Capital Accounts Accumulated Other Comprehensive Income (Loss) Total Membership Interests Balance at December 31, 2020 $ 12,083 $ ( 151 ) $ 11,932 Net income 337 - 337 Capital contributions 125 - 125 Distributions ( 192 ) - ( 192 ) Net effects of cash flow hedges - 1 1 Defined benefit pension plans - 4 4 Balance at June 30, 2021 $ 12,353 $ ( 146 ) $ 12,207 Balance at December 31, 2019 $ 10,938 $ ( 139 ) $ 10,799 Net income 307 - 307 Capital contributions 174 - 174 Distributions ( 183 ) - ( 183 ) Net effects of cash flow hedges - ( 23 ) ( 23 ) Defined benefit pension plans - 3 3 Balance at June 30, 2020 $ 11,236 $ ( 159 ) $ 11,077 Accumulated Other Comprehensive Income (Loss) (AOCI) The following table presents the changes to AOCI for the current and prior period, net of tax: Cash Flow Hedges – Interest Rate Swaps Defined Benefit Pension and OPEB Plans Total Accumulated Other Comprehensive Income (Loss) Balance at December 31, 2020 $ ( 39 ) $ ( 112 ) $ ( 151 ) Defined benefit pension plans - 4 4 Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax expense $-) 1 - 1 Balance at June 30, 2021 $ ( 38 ) $ ( 108 ) $ ( 146 ) Balance at December 31, 2019 $ ( 18 ) $ ( 121 ) $ ( 139 ) Defined benefit pension plans - 3 3 Cash flow hedges – net decrease in fair value of derivatives (net of tax benefit of $ 6 ) ( 23 ) - ( 23 ) Balance at June 30, 2020 $ ( 41 ) $ ( 118 ) $ ( 159 )

Pension And OPEB Plans

Pension And OPEB Plans	6 Months Ended
	Jun. 30, 2021
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 related to 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 retirement plan for certain employees whose retirement benefits cannot be fully earned under the qualified retirement plans. See Note 9 to Financial Statements in our 2020 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. The second plan covers 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 formerly affiliated companies including Vistra. Vistra is solely responsible for its portion of the liability for retiree benefits related to those retirees. See Note 9 to Financial Statements in our 2020 Form 10-K for additional information. Pension and OPEB Costs Our net costs related to pension plans and the Oncor OPEB Plans for the current and prior period were comprised of the following: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Components of net allocated pension costs: Service cost $ 8 $ 7 $ 17 $ 15 Interest cost 21 26 42 51 Expected return on assets ( 25 ) ( 28 ) ( 50 ) ( 55 ) Amortization of net loss 13 12 26 24 Net pension costs 17 17 35 35 Components of net OPEB costs: Service cost 1 2 2 3 Interest cost 7 8 13 16 Expected return on assets ( 2 ) ( 2 ) ( 3 ) ( 4 ) Amortization of prior service cost ( 4 ) ( 5 ) ( 8 ) ( 10 ) Amortization of net loss 5 2 9 5 Net OPEB costs 7 5 13 10 Total net pension and OPEB costs 24 22 48 45 Less amounts deferred principally as property, regulatory asset or regulatory liability ( 5 ) ( 3 ) ( 10 ) ( 7 ) Net amounts recognized as operation and maintenance expense or other deductions $ 19 $ 19 $ 38 $ 38 The discount rates reflected in net pension and OPEB costs in 2021 are 2.39 %, 2.53 % and 2.58 % 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 2021 cost amounts are 4.37 %, 4.20 % and 5.24 % 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 $ 17 million and $ 18 million, respectively, during the six months ended June 30, 2021. We expect to make additional cash contributions to the pension plans and Oncor OPEB Plans of $ 3 million and $ 17 million, respectively, during the remainder of 2021. Our pension plans and Oncor OPEB Plans funding is expected to total approximately $ 61 million and $ 176 million, respectively, in the five-year period from 2021 to 2025 based on the latest actuarial projections.

Related-Party Transactions

Related-Party Transactions	6 Months Ended
	Jun. 30, 2021
Related-Party Transactions [Abstract]
RELATED-PARTY TRANSACTIONS	9. RELATED-PARTY TRANSACTIONS The following represent our significant related-party transactions.  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, 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 2020 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 these regulatory amounts 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 sheets consisted of the following: At June 30, 2021 At December 31, 2020 STH Texas Transmission Total STH Texas Transmission Total Federal income taxes payable (receivable) $ ( 18 ) $ ( 4 ) $ ( 22 ) $ ( 6 ) $ ( 1 ) $ ( 7 ) Texas margin tax payable 14 - 14 23 - 23 Net payable (receivable) $ ( 4 ) $ ( 4 ) $ ( 8 ) $ 17 $ ( 1 ) $ 16 There were no cash payments made to (received from) members related to income taxes for the six months ended June 30, 2020. Cash payments made to (received from) members related to income taxes for the six months ended June 30, 2021 consisted of the following: Six Months Ended June 30, 2021 STH Texas Transmission Total Federal income taxes $ 26 $ 6 $ 32 Texas margin tax 21 - 21 Total payments (receipts) $ 47 $ 6 $ 53 See Note 7 for information regarding capital contributions from and distributions to members.  Sempra owns an indirect 50 percent interest in the parent of Sharyland. Sharyland provided wholesale transmission service to us in the amount of $ 7 million in both the six months ended June 30, 2021 and 2020. We provided Sharyland with substation monitoring and switching services of less than $ 1 million both in the six months ended June 30, 2021 and 2020.

Supplementary Financial Informa

Supplementary Financial Information	6 Months Ended
	Jun. 30, 2021
Supplementary Financial Information [Abstract]
SUPPLEMENTARY FINANCIAL INFORMATION	10. SUPPLEMENTARY FINANCIAL INFORMATION Other Deductions and (Income) Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Professional fees $ 3 $ 2 $ 5 $ 3 Recoverable pension and OPEB – non-service costs 14 14 27 27 AFUDC – equity income ( 7 ) ( 7 ) ( 13 ) ( 12 ) Other, including interest income ( 3 ) 1 ( 5 ) 5 Total other deductions and (income) – net $ 7 $ 10 $ 14 $ 23 Interest Expense and Related Charges Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest $ 103 $ 105 $ 205 $ 206 Amortization of debt issuance costs and discounts 3 2 6 5 Less AFUDC – capitalized interest portion (4) (5) (7) (8) Total interest expense and related charges $ 102 $ 102 $ 204 $ 203 Trade Accounts and Other Receivables Trade accounts and other receivables reported on our balance sheets consisted of the following: At June 30, At December 31, 2021 2020 Gross trade accounts and other receivables $ 774 $ 767 Allowance for uncollectible accounts ( 9 ) ( 7 ) Trade accounts receivable – net $ 765 $ 760 At June 30 , 2021, REP subsidiaries of our two largest customers represented 22 % and 20 % of the trade accounts receivable balance. At December 31, 2020, REP subsidiaries of our two largest customers represented 21 % and 15 % 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 REPs are deferred as a regulatory asset. Investments and Other Property Investments and other property reported on our balance sheets consisted of the following: At June 30, At December 31, 2021 2020 Assets related to employee benefit plans $ 131 $ 124 Land 16 16 Other 2 2 Total investments and other property $ 149 $ 142 Property, Plant and Equipment Property, plant and equipment – net reported on our balance sheets consisted of the following: Composite Depreciation Rate/ At June 30, At December 31, Average Life at June 30, 2021 2021 2020 Assets in service: Distribution 2.5 % / 39.5 years $ 15,421 $ 14,937 Transmission 2.9 % / 34.7 years 12,619 12,156 Other assets 5.8 % / 17.4 years 1,909 1,855 Total 29,949 28,948 Less accumulated depreciation 8,543 8,336 Net of accumulated depreciation 21,406 20,612 Construction work in progress 572 593 Held for future use 20 20 Property, plant and equipment – net $ 21,998 $ 21,225 Intangible Assets Intangible assets (other than goodwill) reported on our balance sheets as part of property, plant and equipment consisted of the following: At June 30, 2021 At December 31, 2020 Gross Gross Carrying Accumulated Carrying Accumulated Amount Amortization Net Amount Amortization Net Identifiable intangible assets subject to amortization: Land easements $ 637 $ 115 $ 522 $ 623 $ 112 $ 511 Capitalized software 1,071 516 555 1,027 484 543 Total $ 1,708 $ 631 $ 1,077 $ 1,650 $ 596 $ 1,054 A ggregate amortization expenses for intangible assets totaled $ 18 million and $ 15 million for the three months ended June 30, 2021 and 2020, respectively, and $ 35 million and $ 31 million for the six months ended June 30, 2021 and 2020, respectively. The estimated annual amortization expense for the five-year period from 2021 to 2025 is as follows: Year Amortization Expense 2021 $ 72 2022 73 2023 73 2024 72 2025 72 Operating Lease, Third-Party Joint Project and Other Obligations Operating lease, third-party joint project and other obligations reported on our balance sheets consisted of the following: At June 30, At December 31, 2021 2020 Operating lease liabilities $ 133 $ 124 Investment tax credits 5 5 Third-party joint project obligation (a) - 100 Other 88 76 Total operating lease, third-party joint project and other obligations $ 226 $ 305 ____________ (a) Related to a joint project with LP&L. See Note 3 for more information. Supplemental Cash Flow Information Six Months Ended June 30, 2021 2020 Cash payments (receipts) related to: Interest $ 204 $ 198 Less capitalized interest ( 7 ) ( 8 ) Interest payments (net of amounts capitalized) $ 197 $ 190 Amount in lieu of income taxes (Note 9): Federal $ 32 $ - State 21 - Total payments (receipts) in lieu of income taxes $ 53 $ - Noncash investing activities: Construction expenditures financed through accounts payable $ 181 $ 242 Transfer of title to assets constructed for and prepaid by LP&L (Note 3) $ 150 $ - ROU assets obtained in exchange for operating lease obligations $ 29 $ 41

Business And Significant Acco_2

Business And Significant Accounting Policies (Policy)	6 Months Ended
	Jun. 30, 2021
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 as apparent in the context. See “Glossary” for the 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, western and panhandle regions of Texas. We are a direct, majority-owned subsidiary of Oncor Holdings, which is indirectly and wholly owned by Sempra. Oncor Holdings owns 80.25 % of our outstanding membership interests and Texas Transmission owns 19.75 % of our outstanding membership interests. We are managed as an integrated business; consequently, there is only one reportable segment.
Ring-Fencing Measures	Ring-Fencing Measures Since 2007, various ring-fencing measures have been taken to enhance our credit quality and the separateness between the Oncor Ring-Fenced Entities and entities with ownership interests in Oncor or Oncor Holdings. These ring-fencing measures serve to mitigate the Oncor Ring-Fenced Entities’ credit exposure to 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 direct or indirect owners of Oncor and Oncor Holdings in connection with a bankruptcy of any such entities. These measures include the November 2008 sale of 19.75 % of Oncor’s equity interests to Texas Transmission. In March 2018, Sempra indirectly acquired Oncor Holdings after obtaining the approval of the PUCT. The PUCT approval was obtained in Docket No. 47675, and the final order issued in that docket (Sempra Acquisition PUCT Order) outlines certain ring-fencing measures, governance mechanisms and restrictions that apply after the acquisition. As a result of these ring-fencing measures, Sempra does not control Oncor, and the ring-fencing measures limit Sempra’s ability to direct the management, policies and operations of Oncor, including the deployment or disposition of Oncor’s assets, declarations of dividends, strategic planning and other important corporate issues and actions. 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. Oncor is a limited liability company governed by a board of directors, not its members. The Sempra Acquisition PUCT Order and our Limited Liability Company Agreement require that the board of directors of Oncor consist of thirteen members, constituted as follows:  seven Disinterested Directors, who (i) shall be independent directors in all material respects under the rules of the New York Stock Exchange in relation to Sempra or its subsidiaries and affiliated entities and any entity with a direct or indirect ownership interest in Oncor or Oncor Holdings, and (ii) shall have no material relationship with Sempra or its subsidiaries or affiliated entities or any entity with a direct or indirect ownership interest in Oncor or Oncor Holdings, currently or within the previous ten years ;  two members designated by Sempra (through Oncor Holdings);  two members designated by Texas Transmission; and  two current or former officers of Oncor (the Oncor Officer Directors), currently Robert S. Shapard and E. Allen Nye, Jr., who are our Chairman of the Board and Chief Executive, respectively. Until March 9, 2028, in order for a current or former officer of Oncor to be eligible to serve as an Oncor Officer Director, the officer cannot have worked for Sempra or any of its affiliates (excluding Oncor Holdings and Oncor) or any other entity with a direct or indirect ownership interest in Oncor or Oncor Holdings in the ten-year period prior to serving as an Oncor Officer Director. Oncor Holdings, at the direction of STIH, has the right to nominate and/or seek the removal of the Oncor Officer Directors, subject to approval by a majority of the Oncor board of directors. STIH is a wholly owned indirect subsidiary of, and controlled by, Sempra. In addition, the Sempra Acquisition PUCT Order provides that Oncor’s board of directors cannot be overruled by the board of Sempra or any of its subsidiaries on dividend policy, the issuance of dividends or other distributions (except for contractual tax payments), debt issuance, capital expenditures, operation and maintenance expenditures, management and service fees, and appointment or removal of board members, provided that certain actions may also require the additional approval of the Oncor Holdings board of directors. The Sempra Acquisition PUCT Order also provides that any changes to the size, composition, structure or rights of the board must first be approved by the PUCT. In addition, if Sempra acquires Texas Transmission’s interest in Oncor, the two board positions on Oncor’s board of directors that Texas Transmission is entitled to appoint will be eliminated and the size of Oncor’s board of directors will be reduced by two. Additional regulatory commitments, governance mechanisms and restrictions provided in the Sempra Acquisition PUCT Order and our Limited Liability Company Agreement to ring-fence Oncor from its owners include, among others:  A majority of the Disinterested Directors of Oncor and the directors designated by Texas Transmission that are present and voting (of which at least one must be present and voting) must approve any annual or multi-year budget if the aggregate amount of capital expenditures or operating and maintenance expenditures in such budget is more than a 10 % increase or decrease from the corresponding amounts of such expenditures in the budget for the preceding fiscal year or multi-year period, as applicable;  Oncor may not pay any dividends or make any other distributions (except for contractual tax payments) if a majority of its Disinterested Directors or either of the two directors appointed by Texas Transmission determines that it is in the best interests of Oncor to retain such amounts to meet expected future requirements;  At all times, Oncor will remain in compliance with the debt-to-equity ratio established by the PUCT from time to time for ratemaking purposes, and Oncor will not pay dividends or other distributions (except for contractual tax payments), if that payment would cause its debt-to-equity ratio to exceed the debt-to-equity ratio approved by the PUCT;  If the credit rating on Oncor’s senior secured debt by any of the three major rating agencies falls below BBB (or the equivalent), Oncor will suspend dividends and other distributions (except for contractual tax payments), unless otherwise allowed by the PUCT;  Without the prior approval of the PUCT, neither Sempra nor any of its affiliates (excluding Oncor) will incur, guaranty or pledge assets in respect of any indebtedness that is dependent on the revenues of Oncor in more than a proportionate degree than the other revenues of Sempra or on the membership interests of Oncor, and there will be no debt at STH or STIH at any time following Sempra’s acquisition of Oncor Holdings;  Neither Oncor nor Oncor Holdings will lend money to or borrow money from Sempra or any of its affiliates (other than Oncor subsidiaries), or any entity with a direct or indirect ownership interest in Oncor or Oncor Holdings, and neither Oncor nor Oncor Holdings will share credit facilities with Sempra or any of its affiliates (other than Oncor subsidiaries), or any entity with a direct or indirect ownership interest in Oncor or Oncor Holdings;  There must be maintained certain “separateness measures” that reinforce the legal and financial separation of Oncor from its owners, including a requirement that dealings between Oncor, Oncor Holdings and their subsidiaries with Sempra, any of Sempra’s other affiliates or any entity with a direct or indirect ownership interest in Oncor or Oncor Holdings, must be on an arm’s-length basis, limitations on affiliate transactions, separate recordkeeping requirements and a prohibition on Sempra or its affiliates pledging Oncor assets or membership interests for any entity other than Oncor; and  Sempra will continue to hold indirectly at least 51 % of the ownership interests in Oncor and Oncor Holdings for at least five years following Sempra’s March 2018 acquisition of Oncor Holdings, unless otherwise specifically authorized by the PUCT.
Basis Of Presentation	Basis of Presentation These unaudited condensed consolidated financial statements should be read in conjunction with the audited financial statements and related notes included in our 2020 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 appropriate 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 12 to Financial Statements in our 2020 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	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.
Interest Rate Derivatives And Hedge Accounting	Interest Rate Derivatives and Hedge Accounting We are exposed to interest rates primarily as a result of our current and expected use of financing. We may, from time to time, utilize interest rate derivative instruments typically designated as cash flow hedges, to lock in interest rates in anticipation of future financings. We may designate an interest rate derivative instrument as a cash flow hedge if it effectively converts anticipated cash flows associated with interest payments to a fixed dollar amount. In accounting for cash flow hedges, derivative assets and liabilities are recorded on the balance sheet at fair value with an offset to other comprehensive income. Amounts remain in accumulated other comprehensive income and are reclassified into net income as the interest expense on the related debt affects net income.
Impairment Of Long-Lived Assets And Goodwill	Impairment of Long-Lived Assets and Goodwill We evaluate long-lived assets (including intangible assets with finite lives) for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. We also evaluate goodwill for impairment annually on October 1 and whenever events or changes in circumstances indicate that an impairment may exist. The determination of the existence of these and other indications of impairment involves judgments that are subjective in nature and may require the use of estimates in forecasting future results and cash flows.
Effects Of Reference Rate Reform On Financial Reporting	Effects of Reference Rate Reform on Financial Reporting Our Credit Facility and term loan credit agreements use LIBOR as a benchmark for establishing interest rates. In the event we modify our Credit Facility or term loan credit agreements related to the phase-out of LIBOR, we will evaluate the optional expedients and exceptions under ASU No. 2020-04. The standard allows entities to account for contract modifications as an event that does not require reassessment or remeasurement (i.e., as a continuation of the existing contract).

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2021
Regulatory Matters [Abstract]
Components Of Regulatory Assets And Liabilities	Remaining Rate Recovery/Amortization Period At June 30, 2021 At June 30, 2021 At December 31, 2020 Regulatory assets: Employee retirement liability (a)(b)(c) To be determined $ 648 $ 672 Employee retirement costs being amortized 7 years 209 227 Employee retirement costs incurred since the last rate review period (b) To be determined 94 67 Self-insurance reserve (primarily storm recovery costs) being amortized 7 years 245 266 Self-insurance reserve incurred since the last rate review period (primarily storm related) (b) To be determined 368 256 Debt reacquisition costs Lives of related debt 22 25 Under-recovered AMS costs 7 years 138 149 Energy efficiency performance bonus (a) 1 year or less 7 14 Wholesale distribution substation service To be determined 65 55 Unrecovered expenses related to COVID-19 To be determined 32 27 Under-recovered wholesale transmission service expense (a) 1 year or less 32 - Other regulatory assets Various 38 21 Total regulatory assets 1,898 1,779 Regulatory liabilities: Estimated net removal costs Lives of related assets 1,314 1,262 Excess deferred taxes Primarily over lives of related assets 1,475 1,508 Over-recovered wholesale transmission service expense (a) 1 year or less - 52 Unamortized gain on reacquisition of debt Lives of related debt 26 27 Employee retirement costs over-recovered since last rate review period (b) To be determined 30 - Other regulatory liabilities Various 11 6 Total regulatory liabilities 2,856 2,855 Net regulatory assets (liabilities) $ ( 958 ) $ ( 1,076 ) ____________ (a) Not earning a return in the regulatory rate-setting process. (b) Recovery/refund 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)

Revenues (Tables)	6 Months Ended
	Jun. 30, 2021
Revenues [Abstract]
Disaggregation Of Revenues	Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Operating revenues Revenues contributing to earnings: Distribution base revenues $ 517 $ 519 $ 1,058 $ 1,014 Transmission base revenues (TCOS revenues): Billed to third-party wholesale customers 222 200 429 395 Billed to REPs serving Oncor distribution customers, through TCRF 120 111 234 221 Total transmission base revenues 342 311 663 616 Other miscellaneous revenues 19 18 36 34 Total revenues contributing to earnings 878 848 1,757 1,664 Revenues collected for pass-through expenses: TCRF – third-party wholesale transmission service 260 233 509 478 EECRF 9 9 20 20 Total revenues collected for pass-through expenses 269 242 529 498 Total operating revenues $ 1,147 $ 1,090 $ 2,286 $ 2,162

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	6 Months Ended
	Jun. 30, 2021
Short-Term Borrowings [Abstract]
Schedule Of Short-Term Borrowings	At June 30, At December 31, 2021 2020 Total credit facility borrowing capacity $ 2,000 $ 2,000 Commercial paper outstanding (a) ( 7 ) ( 70 ) Credit facility outstanding (b) - - Letters of credit outstanding (c) ( 8 ) ( 9 ) Available unused credit $ 1,985 $ 1,921 ____________ (a) The weighted average interest rates for commercial paper were 0.12% at June 30, 2021 and 0.17 % at December 31, 2020. (b) At June 30, 2021, the applicable interest rate for any outstanding borrowings was LIBOR plus 1.25 %. (c) Interest rates on outstanding letters of credit were 1.45 % at both June 30, 2021 and December 31, 2020, based on our credit ratings.

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2021
Long-Term Debt [Abstract]
Schedule Of Long-Term Debt	At June 30, At December 31, 2021 2020 Fixed Rate Secured: 4.10 % Senior Notes due June 1, 2022 $ 400 $ 400 7.00 % Debentures due September 1, 2022 482 482 2.75 % Senior Notes due June 1, 2024 500 500 2.95 % Senior Notes due April 1, 2025 350 350 0.55 % Senior Notes due October 1, 2025 450 450 3.86 % Senior Notes Series A, due December 3, 2025 174 174 3.86 % Senior Notes Series B, due January 14, 2026 38 38 3.70 % Senior Notes due November 15, 2028 650 650 5.75 % Senior Notes due March 15, 2029 318 318 2.75 % Senior Notes due May 15, 2030 400 400 7.00 % Senior Notes due May 1, 2032 494 494 7.25 % Senior Notes due January 15, 2033 323 323 7.50 % Senior Notes due September 1, 2038 300 300 5.25 % Senior Notes due September 30, 2040 475 475 4.55 % Senior Notes due December 1, 2041 400 400 5.30 % Senior Notes due June 1, 2042 348 348 3.75 % Senior Notes due April 1, 2045 550 550 3.80 % Senior Notes due September 30, 2047 325 325 4.10 % Senior Notes due November 15, 2048 450 450 3.80 % Senior Notes due June 1, 2049 500 500 3.10 % Senior Notes due September 15, 2049 700 700 3.70 % Senior Notes due May 15, 2050 400 400 5.35 % Senior Notes due October 1, 2052 300 300 Secured long-term debt 9,327 9,327 Variable Rate Unsecured: Term loan credit agreement maturing February 28, 2022 300 - Term loan credit agreement maturing May 17, 2022 450 - Term loan credit agreement maturing August 15, 2022 20 - Total long-term debt 10,097 9,327 Unamortized discount and debt issuance costs ( 94 ) ( 98 ) Less amount due currently ( 1,150 ) - Long-term debt, less amounts due currently $ 8,853 $ 9,229

Membership Interests (Tables)

Membership Interests (Tables)	6 Months Ended
	Jun. 30, 2021
Membership Interests [Abstract]
Schedule Of Cash Capital Contributions	Receipt Date Amount February 16, 2021 $ 63 April 27, 2021 63
Schedule Of Distributions Paid	Declaration Date Payment Date Amount February 17, 2021 February 18, 2021 $ 96 April 28, 2021 April 29, 2021 96
Schedule Of Changes To Membership Interests	The following tables present the changes to membership interests during the three and six months ended June 30, 2021 and 2020, net of tax: Capital Accounts Accumulated Other Comprehensive Income (Loss) Total Membership Interests Balance at March 31, 2021 $ 12,218 $ ( 149 ) $ 12,069 Net income 169 - 169 Capital contributions 62 - 62 Distributions ( 96 ) - ( 96 ) Defined benefit pension plans - 3 3 Balance at June 30, 2021 $ 12,353 $ ( 146 ) $ 12,207 Balance at March 31, 2020 $ 11,065 $ ( 161 ) $ 10,904 Net income 176 - 176 Capital contributions 87 - 87 Distributions ( 92 ) - ( 92 ) Defined benefit pension plans - 2 2 Balance at June 30, 2020 $ 11,236 $ ( 159 ) $ 11,077 Capital Accounts Accumulated Other Comprehensive Income (Loss) Total Membership Interests Balance at December 31, 2020 $ 12,083 $ ( 151 ) $ 11,932 Net income 337 - 337 Capital contributions 125 - 125 Distributions ( 192 ) - ( 192 ) Net effects of cash flow hedges - 1 1 Defined benefit pension plans - 4 4 Balance at June 30, 2021 $ 12,353 $ ( 146 ) $ 12,207 Balance at December 31, 2019 $ 10,938 $ ( 139 ) $ 10,799 Net income 307 - 307 Capital contributions 174 - 174 Distributions ( 183 ) - ( 183 ) Net effects of cash flow hedges - ( 23 ) ( 23 ) Defined benefit pension plans - 3 3 Balance at June 30, 2020 $ 11,236 $ ( 159 ) $ 11,077
Schedule Of Changes To Accumulated Other Comprehensive Income (Loss)	Cash Flow Hedges – Interest Rate Swaps Defined Benefit Pension and OPEB Plans Total Accumulated Other Comprehensive Income (Loss) Balance at December 31, 2020 $ ( 39 ) $ ( 112 ) $ ( 151 ) Defined benefit pension plans - 4 4 Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax expense $-) 1 - 1 Balance at June 30, 2021 $ ( 38 ) $ ( 108 ) $ ( 146 ) Balance at December 31, 2019 $ ( 18 ) $ ( 121 ) $ ( 139 ) Defined benefit pension plans - 3 3 Cash flow hedges – net decrease in fair value of derivatives (net of tax benefit of $ 6 ) ( 23 ) - ( 23 ) Balance at June 30, 2020 $ ( 41 ) $ ( 118 ) $ ( 159 )

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2021
Pension And OPEB Plans [Abstract]
Schedule Of Pension And OPEB Plan Costs	Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Components of net allocated pension costs: Service cost $ 8 $ 7 $ 17 $ 15 Interest cost 21 26 42 51 Expected return on assets ( 25 ) ( 28 ) ( 50 ) ( 55 ) Amortization of net loss 13 12 26 24 Net pension costs 17 17 35 35 Components of net OPEB costs: Service cost 1 2 2 3 Interest cost 7 8 13 16 Expected return on assets ( 2 ) ( 2 ) ( 3 ) ( 4 ) Amortization of prior service cost ( 4 ) ( 5 ) ( 8 ) ( 10 ) Amortization of net loss 5 2 9 5 Net OPEB costs 7 5 13 10 Total net pension and OPEB costs 24 22 48 45 Less amounts deferred principally as property, regulatory asset or regulatory liability ( 5 ) ( 3 ) ( 10 ) ( 7 ) Net amounts recognized as operation and maintenance expense or other deductions $ 19 $ 19 $ 38 $ 38

Related-Party Transactions (Tab

Related-Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2021
Related-Party Transactions [Abstract]
Schedule Of Amounts Payable To (Receivables From) Related Parties	At June 30, 2021 At December 31, 2020 STH Texas Transmission Total STH Texas Transmission Total Federal income taxes payable (receivable) $ ( 18 ) $ ( 4 ) $ ( 22 ) $ ( 6 ) $ ( 1 ) $ ( 7 ) Texas margin tax payable 14 - 14 23 - 23 Net payable (receivable) $ ( 4 ) $ ( 4 ) $ ( 8 ) $ 17 $ ( 1 ) $ 16
Schedule Of Cash Payments Made To (Received From) Related Parties	Six Months Ended June 30, 2021 STH Texas Transmission Total Federal income taxes $ 26 $ 6 $ 32 Texas margin tax 21 - 21 Total payments (receipts) $ 47 $ 6 $ 53

Supplementary Financial Infor_2

Supplementary Financial Information (Tables)	6 Months Ended
	Jun. 30, 2021
Supplementary Financial Information [Abstract]
Schedule Of Other Deductions And (Income)	Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Professional fees $ 3 $ 2 $ 5 $ 3 Recoverable pension and OPEB – non-service costs 14 14 27 27 AFUDC – equity income ( 7 ) ( 7 ) ( 13 ) ( 12 ) Other, including interest income ( 3 ) 1 ( 5 ) 5 Total other deductions and (income) – net $ 7 $ 10 $ 14 $ 23
Schedule Of Interest Expense And Related Charges	Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Interest $ 103 $ 105 $ 205 $ 206 Amortization of debt issuance costs and discounts 3 2 6 5 Less AFUDC – capitalized interest portion (4) (5) (7) (8) Total interest expense and related charges $ 102 $ 102 $ 204 $ 203
Schedule Of Trade Accounts And Other Receivables	At June 30, At December 31, 2021 2020 Gross trade accounts and other receivables $ 774 $ 767 Allowance for uncollectible accounts ( 9 ) ( 7 ) Trade accounts receivable – net $ 765 $ 760
Summary of Investments And Other Property	At June 30, At December 31, 2021 2020 Assets related to employee benefit plans $ 131 $ 124 Land 16 16 Other 2 2 Total investments and other property $ 149 $ 142
Schedule Of Property, Plant And Equipment	Composite Depreciation Rate/ At June 30, At December 31, Average Life at June 30, 2021 2021 2020 Assets in service: Distribution 2.5 % / 39.5 years $ 15,421 $ 14,937 Transmission 2.9 % / 34.7 years 12,619 12,156 Other assets 5.8 % / 17.4 years 1,909 1,855 Total 29,949 28,948 Less accumulated depreciation 8,543 8,336 Net of accumulated depreciation 21,406 20,612 Construction work in progress 572 593 Held for future use 20 20 Property, plant and equipment – net $ 21,998 $ 21,225
Schedule Of Intangible Assets	At June 30, 2021 At December 31, 2020 Gross Gross Carrying Accumulated Carrying Accumulated Amount Amortization Net Amount Amortization Net Identifiable intangible assets subject to amortization: Land easements $ 637 $ 115 $ 522 $ 623 $ 112 $ 511 Capitalized software 1,071 516 555 1,027 484 543 Total $ 1,708 $ 631 $ 1,077 $ 1,650 $ 596 $ 1,054
Schedule Of Estimated Aggregate Amortization Expenses	Year Amortization Expense 2021 $ 72 2022 73 2023 73 2024 72 2025 72
Schedule Of Operating Lease, Third Party Joint Project And Other Obligations	At June 30, At December 31, 2021 2020 Operating lease liabilities $ 133 $ 124 Investment tax credits 5 5 Third-party joint project obligation (a) - 100 Other 88 76 Total operating lease, third-party joint project and other obligations $ 226 $ 305 ____________ (a) Related to a joint project with LP&L. See Note 3 for more information.
Schedule Of Supplemental Cash Flow Information	Six Months Ended June 30, 2021 2020 Cash payments (receipts) related to: Interest $ 204 $ 198 Less capitalized interest ( 7 ) ( 8 ) Interest payments (net of amounts capitalized) $ 197 $ 190 Amount in lieu of income taxes (Note 9): Federal $ 32 $ - State 21 - Total payments (receipts) in lieu of income taxes $ 53 $ - Noncash investing activities: Construction expenditures financed through accounts payable $ 181 $ 242 Transfer of title to assets constructed for and prepaid by LP&L (Note 3) $ 150 $ - ROU assets obtained in exchange for operating lease obligations $ 29 $ 41

Business And Significant Acco_3

Business And Significant Accounting Policies (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021USD ($)itementity	Dec. 31, 2020USD ($)
Business And Significant Accounting Polices [Line Items]
Number of board of directors	13
Number of disinterested directors	7
Direct or indirect ownership interest time period	10 years
Number of board positions to be eliminated upon acquisition	2
Number of directors appointed | entity	2
Goodwill | $	$ 4,740	$ 4,740
Oncor Holdings [Member]
Business And Significant Accounting Polices [Line Items]
Number of disinterested directors	2
Texas Transmission [Member]
Business And Significant Accounting Polices [Line Items]
Number of disinterested directors	2
Sempra Energy [Member]
Business And Significant Accounting Polices [Line Items]
Number of disinterested directors	2
Oncor Holdings [Member]
Business And Significant Accounting Polices [Line Items]
Ownership	80.25%
Oncor Holdings [Member] | Sempra Energy [Member]
Business And Significant Accounting Polices [Line Items]
Percentage of membership interest owned by non-controlling owners	51.00%
Ownership holding period	5 years
Texas Transmission [Member]
Business And Significant Accounting Polices [Line Items]
Percentage of membership interest owned by non-controlling owners	19.75%
Minimum [Member]
Business And Significant Accounting Polices [Line Items]
Disinterested directors expenditure budget percentage	10.00%

Regulatory Matters (Narrative)

Regulatory Matters (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]
Current authorized regulatory capitalization ratio, debt	57.50%
Current authorized regulatory capitalization ratio, equity	42.50%
Net regulatory asset	$ (958)	$ (1,076)
PUCT COVID-19 [Member]
Public Utilities, General Disclosures [Line Items]
Net regulatory asset	$ 32

Regulatory Matters (Components

Regulatory Matters (Components Of Regulatory Assets And Liabilities) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Regulatory Assets And Liabilities [Line Items]
Carrying Amount, Regulatory Assets	$ 1,898	$ 1,779
Carrying Amount, Regulatory Liabilities	2,856	2,855
Net regulatory assets (liabilities)	$ (958)	(1,076)
Estimated Net Removal Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Lives of related assets
Carrying Amount, Regulatory Liabilities	$ 1,314	1,262
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	$ 1,475	1,508
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
Unamortized Gain On Reacquisition Of Debt [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Lives of related debt
Carrying Amount, Regulatory Assets	$ 26	27
Employee Retirement Costs Over-recovered Since Last Rate Review Period [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	$ 30
Other Regulatory Liabilities [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Various
Carrying Amount, Regulatory Liabilities	$ 11	6
Employee Retirement Liability [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	$ 648	672
Employee Retirement Costs Being Amortized [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	7 years
Carrying Amount, Regulatory Assets	$ 209	227
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	$ 94	67
Self-Insurance Reserve (Primarily Storm Recovery Costs) Being Amortized [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	7 years
Carrying Amount, Regulatory Assets	$ 245	266
Self-Insurance Reserve Incurred Since The Last Rate Review Period (Primarily Storm Related) [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	$ 368	256
Debt Reacquisition Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Lives of related debt
Carrying Amount, Regulatory Assets	$ 22	25
Under-recovered AMS Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	7 years
Carrying Amount, Regulatory Assets	$ 138	149
Energy Efficiency Performance Bonus [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	1 year or less
Carrying Amount, Regulatory Assets	$ 7	14
Wholesale Distribution Substation Service [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	$ 65	55
Unrecovered Expenses Related To COVID-19 [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	$ 32	27
Under-Recovered Wholesale Transmission Service Expense [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	1 year or less
Carrying Amount, Regulatory Assets	$ 32
Other Regulatory Assets [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Various
Carrying Amount, Regulatory Assets	$ 38	$ 21

Revenues (Narrative) (Details)

Revenues (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021USD ($)	Jun. 30, 2021USD ($)miitemcustomer
Disaggregation of Revenue [Line Items]
Number of REPS | item		85
Number of counterparties | customer		2
Payment term		35 days
Transmission line to be built, joint project | mi		175
REP Subsidiary One [Member] | Revenue Benchmark [Member] | Customers [Member]
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	21.00%	24.00%
REP Subsidiary Two [Member] | Revenue Benchmark [Member] | Customers [Member]
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	19.00%	22.00%
Lubbock Power & Light (LP&L) [Member]
Disaggregation of Revenue [Line Items]
Joint project cost | $	$ 370	$ 370

Revenues (Disaggregation Of Rev

Revenues (Disaggregation Of Revenues) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	$ 878	$ 848	$ 1,757	$ 1,664
Total revenues collected for pass-through expenses	269	242	529	498
Total operating revenues	1,147	1,090	2,286	2,162
Distribution Base Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	517	519	1,058	1,014
Transmission Base Revenues (TCOS Revenues) [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	342	311	663	616
Transmission Base Revenues (TCOS Revenues) [Member] | Third-Party Wholesale Customers [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	222	200	429	395
Transmission Base Revenues (TCOS Revenues) [Member] | REPS Serving Oncor Distribution Customers, Through TCRF [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	120	111	234	221
Other Miscellaneous Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	19	18	36	34
TCRF - Third-party Wholesale Transmission Service [Member]
Disaggregation of Revenue [Line Items]
Total revenues collected for pass-through expenses	260	233	509	478
EECRF [Member]
Disaggregation of Revenue [Line Items]
Total revenues collected for pass-through expenses	$ 9	$ 9	$ 20	$ 20

Short-Term Borrowings (Narrativ

Short-Term Borrowings (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021contract	Mar. 31, 2018USD ($)	Nov. 30, 2017USD ($)
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 [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Possible additional increase in borrowing capacity amount			400
Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Possible additional increase in borrowing capacity amount			$ 100
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 2,000

Short-Term Borrowings (Schedule

Short-Term Borrowings (Schedule Of Short-Term Borrowings) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Total credit facility borrowing capacity	$ 2,000	$ 2,000
Available unused credit	1,985	1,921
Commercial Paper [Member]
Short-term Debt [Line Items]
Outstanding	(7)	$ (70)
Weighted average interest rate		0.17%
Letter of Credit [Member]
Short-term Debt [Line Items]
Outstanding	$ (8)	$ (9)
Weighted average interest rate	1.45%	1.45%
One-Month London Interbank Offered Rate [Member]
Short-term Debt [Line Items]
Spread over variable rate	1.25%

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 29, 2021	Mar. 31, 2021	Mar. 17, 2021	Feb. 26, 2021	Jan. 29, 2021	Dec. 31, 2020
Long-Term Debt [Line Items]
Repayments of long-term debt		$ 465,000,000
Estimated fair value of our long-term debt including current maturities	$ 11,935,000,000							$ 11,638,000,000
Carrying amount	$ 10,003,000,000							9,229,000,000
One-Month London Interbank Offered Rate [Member]
Long-Term Debt [Line Items]
Spread over variable rate	1.25%
Term Loan Agreement Maturing February 28, 2022 [Member]
Long-Term Debt [Line Items]
Term loan	$ 300,000,000						$ 300,000,000
Debt principal amount						$ 140,000,000	$ 160,000,000
Term Loan Agreement Maturing February 28, 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Long-Term Debt [Line Items]
Spread over variable rate	0.675%
Term Loan Agreement Maturing February 28, 2022 [Member] | Federal Funds Effective Rate [Member]
Long-Term Debt [Line Items]
Spread over variable rate	0.50%
Term Loan Agreement Maturing February 28, 2022 [Member] | One-Month London Interbank Offered Rate [Member]
Long-Term Debt [Line Items]
Spread over variable rate	1.00%
Term Loan Agreement Maturing May 17, 2022 [Member]
Long-Term Debt [Line Items]
Term loan					$ 450,000,000
Debt principal amount				$ 170,000,000
Term Loan Agreement Maturing May 17, 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Long-Term Debt [Line Items]
Spread over variable rate	0.65%
Term Loan Agreement Maturing May 17, 2022 [Member] | Federal Funds Effective Rate [Member]
Long-Term Debt [Line Items]
Spread over variable rate	0.50%
Term Loan Agreement Maturing May 17, 2022 [Member] | One-Month London Interbank Offered Rate [Member]
Long-Term Debt [Line Items]
Spread over variable rate	1.00%
Term Loan Agreement Maturing August 15, 2022 [Member]
Long-Term Debt [Line Items]
Term loan	$ 540,000,000
Debt principal amount			$ 20,000,000
Term Loan Agreement Maturing August 15, 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Long-Term Debt [Line Items]
Spread over variable rate	0.60%
Term Loan Agreement Maturing August 15, 2022 [Member] | Federal Funds Effective Rate [Member]
Long-Term Debt [Line Items]
Spread over variable rate	0.50%
Term Loan Agreement Maturing August 15, 2022 [Member] | 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]
Aggregate principal amount	$ 9,327,000,000							9,327,000,000
Percentage of fair value of cost of property additions certified to the Deed of Trust collateral agent	85.00%
Available bond credits	$ 2,114,000,000
Future debt subject to property additions to the Deed of Trust	4,393,000,000
Secured Debt [Member] | 0.55% Senior Notes due October 1, 2025 [Member]
Long-Term Debt [Line Items]
Aggregate principal amount	450,000,000							450,000,000
Secured Debt [Member] | 2.75% Senior Notes due May 15, 2030 [Member]
Long-Term Debt [Line Items]
Aggregate principal amount	400,000,000							400,000,000
Secured Debt [Member] | 3.70% Senior Notes Due May 15, 2050 [Member]
Long-Term Debt [Line Items]
Aggregate principal amount	400,000,000							400,000,000
Secured Debt [Member] | 7.00% Fixed Senior Notes Due May 1, 2032 [Member]
Long-Term Debt [Line Items]
Aggregate principal amount	494,000,000							494,000,000
Secured Debt [Member] | 7.25% Fixed Senior Notes Due January 15, 2033 [Member]
Long-Term Debt [Line Items]
Aggregate principal amount	323,000,000							323,000,000
Secured Debt [Member] | 5.30% Fixed Senior Notes Due June 1, 2042 [Member]
Long-Term Debt [Line Items]
Aggregate principal amount	348,000,000							348,000,000
Secured Debt [Member] | 5.35% Senior Notes due October 1, 2052 [Member]
Long-Term Debt [Line Items]
Aggregate principal amount	300,000,000							$ 300,000,000
Unsecured Debt [Member] | Term Loan Agreement Maturing February 28, 2022 [Member]
Long-Term Debt [Line Items]
Term loan	300,000,000
Unsecured Debt [Member] | Term Loan Agreement Maturing May 17, 2022 [Member]
Long-Term Debt [Line Items]
Term loan	450,000,000
Unsecured Debt [Member] | Term Loan Agreement Maturing August 15, 2022 [Member]
Long-Term Debt [Line Items]
Term loan	$ 20,000,000

Long-Term Debt (Schedule Of Lon

Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 17, 2021	Jan. 29, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total long-term debt	$ 10,097			$ 9,327
Unamortized discount and debt issuance costs	(94)			(98)
Less amount due currently	(1,150)
Long-term debt, less amounts due currently	8,853			9,229
Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	9,327			9,327
4.10% Fixed Senior Notes Due June 1, 2022 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 400			$ 400
Interest percentage	4.10%			4.10%
7.00% Fixed Debentures Due September 1, 2022 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 482			$ 482
Interest percentage	7.00%			7.00%
2.75% Senior Notes due June 1, 2024 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 500			$ 500
Interest percentage	2.75%			2.75%
2.95% Fixed Senior Notes Due April 1, 2025 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 350			$ 350
Interest percentage	2.95%			2.95%
0.55% Senior Notes due October 1, 2025 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 450			$ 450
Interest percentage	0.55%			0.55%
3.86% Senior Notes, Series A, due December 3, 2025 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 174			$ 174
Interest percentage	3.86%			3.86%
3.86% Senior Notes, Series B, due January 14, 2026 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 38			$ 38
Interest percentage	3.86%			3.86%
3.70% Fixed Senior Notes Due November 15, 2028 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 650			$ 650
Interest percentage	3.70%			3.70%
5.75% Fixed Senior Notes Due March 15, 2029 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 318			$ 318
Interest percentage	5.75%			5.75%
2.75% Senior Notes due May 15, 2030 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 400			$ 400
Interest percentage	2.75%			2.75%
7.00% Fixed Senior Notes Due May 1, 2032 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 494			$ 494
Interest percentage	7.00%			7.00%
7.25% Fixed Senior Notes Due January 15, 2033 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 323			$ 323
Interest percentage	7.25%			7.25%
7.50% Fixed Senior Notes Due September 1, 2038 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 300			$ 300
Interest percentage	7.50%			7.50%
5.25% Fixed Senior Notes Due September 30, 2040 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 475			$ 475
Interest percentage	5.25%			5.25%
4.55% Fixed Senior Notes Due December 1, 2041 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 400			$ 400
Interest percentage	4.55%			4.55%
5.30% Fixed Senior Notes Due June 1, 2042 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 348			$ 348
Interest percentage	5.30%			5.30%
3.75% Fixed Senior Notes Due April 1, 2045 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 550			$ 550
Interest percentage	3.75%			3.75%
3.80% Fixed Senior Notes Due September 30, 2047 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 325			$ 325
Interest percentage	3.80%			3.80%
4.10% Fixed Senior Notes Due November 15, 2048 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 450			$ 450
Interest percentage	4.10%			4.10%
3.80% Senior Notes, Due June 1, 2049 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 500			$ 500
Interest percentage	3.80%			3.80%
3.10% Senior Notes, Due September 15, 2049 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 700			$ 700
Interest percentage	3.10%			3.10%
3.70% Senior Notes Due May 15, 2050 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 400			$ 400
Interest percentage	3.70%			3.70%
5.35% Senior Notes due October 1, 2052 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 300			$ 300
Interest percentage	5.35%			5.35%
Term Loan Agreement Maturing February 28, 2022 [Member]
Debt Instrument [Line Items]
Term loan	$ 300		$ 300
Term Loan Agreement Maturing February 28, 2022 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Term loan	300
Term Loan Agreement Maturing May 17, 2022 [Member]
Debt Instrument [Line Items]
Term loan		$ 450
Term Loan Agreement Maturing May 17, 2022 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Term loan	450
Term Loan Agreement Maturing August 15, 2022 [Member]
Debt Instrument [Line Items]
Term loan	540
Term Loan Agreement Maturing August 15, 2022 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Term loan	$ 20

Membership Interests (Narrative

Membership Interests (Narrative) (Details) - USD ($) $ in Millions	Jul. 27, 2021	Jun. 30, 2021	Jun. 30, 2020	Jul. 28, 2021
Subsequent Event [Line Items]
Members contribution		$ 125	$ 174
Cash available for distribution		$ 1,123		$ 546
Current authorized regulatory capitalization ratio, debt		57.50%
Current authorized regulatory capitalization ratio, equity		42.50%
Regulatory capitalization ratio, debt		54.00%
Regulatory capitalization ratio, equity		46.00%
Subsequent Event [Member]
Subsequent Event [Line Items]
Members contribution	$ 62

Membership Interests (Schedule

Membership Interests (Schedule Of Cash Capital Contributions) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Related Party Transaction [Line Items]
Members contribution	$ 125	$ 174
February 16, 2021 [Member]
Related Party Transaction [Line Items]
Members contribution	63
April 27, 2021 [Member]
Related Party Transaction [Line Items]
Members contribution	$ 63

Membership Interests (Schedul_2

Membership Interests (Schedule Of Distributions Paid) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Dividends Payable [Line Items]
Amount	$ 192	$ 183
Payment One [Member]
Dividends Payable [Line Items]
Amount	96
Payment Two [Member]
Dividends Payable [Line Items]
Amount	$ 96

Membership Interests (Schedul_3

Membership Interests (Schedule Of Changes To Membership Interests) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance			$ 11,932
Net income	$ 169	$ 176	337	$ 307
Distributions			(192)	(183)
Capital contributions			125	174
Net effects of cash flow hedges			1	(23)
Defined benefit pension plans	3	2	4	3
Balance	12,207		12,207
Capital Accounts [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance	12,218	11,065	12,083	10,938
Net income	169	176	337	307
Distributions	62	87	125	174
Capital contributions	(96)	(92)	(192)	(183)
Net effects of cash flow hedges
Defined benefit pension plans
Balance	12,353	11,236	12,353	11,236
Accumulated Other Comprehensive Income (Loss) [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance	(149)	(161)	(151)	(139)
Net income
Distributions
Capital contributions
Net effects of cash flow hedges			1	(23)
Defined benefit pension plans	3	2	4	3
Balance	(146)	(159)	(146)	(159)
Membership Interests [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance	12,069	10,904	11,932	10,799
Net income	169	176	337	307
Distributions	62	87	125	174
Capital contributions	(96)	(92)	(192)	(183)
Net effects of cash flow hedges			1	(23)
Defined benefit pension plans	3	2	4	3
Balance	$ 12,207	$ 11,077	$ 12,207	$ 11,077

Membership Interests (Schedul_4

Membership Interests (Schedule Of Changes To Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (151)
Balance at end of period	(146)
Tax benefit cash flow hedges		$ 6
Cash Flow Hedges - Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(39)	(18)
Defined benefit pension plans
Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax $-)	1	(23)
Balance at end of period	(38)	(41)
Defined Benefit Pension and OPEB Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(112)	(121)
Defined benefit pension plans	4	3
Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax $-)
Balance at end of period	(108)	(118)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(151)	(139)
Defined benefit pension plans	4	3
Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax $-)	1	(23)
Balance at end of period	$ (146)	$ (159)

Pension And OPEB Plans (Narrati

Pension And OPEB Plans (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)item	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of defined pension plans in which the Company participates | item			2
Percentage of plan attributed to regulated business			100.00%
Regulatory assets	$ 1,898		$ 1,898		$ 1,779
Oncor Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			2.39%
Expected return on plan assets			4.37%
Vistra Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			2.53%
Expected return on plan assets			4.20%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net loss	13	$ 12	$ 26	$ 24
Amortization of net actuarial loss	(13)	(12)	(26)	(24)
Cash contributions			17
Additional cash contributions	3		3
Additional cash contributions, next five years			61
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net loss	5	2	9	5
Amortization of prior service cost (credit)	(4)	(5)	(8)	(10)
Amortization of net actuarial loss	(5)	$ (2)	$ (9)	$ (5)
Discount rate			2.58%
Expected return on plan assets			5.24%
Cash contributions			$ 18
Additional cash contributions	$ 17		17
Additional cash contributions, next five years			$ 176

Pension And OPEB Plans (Schedul

Pension And OPEB Plans (Schedule Of Pension And OPEB Plan Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Net costs	$ 24	$ 22	$ 48	$ 45
Less amounts deferred principally as property, or a regulatory asset or regulatory liability	(5)	(3)	(10)	(7)
Net amounts recognized as operation and maintenance expense or other deductions	19	19	38	38
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	7	17	15
Interest cost	21	26	42	51
Expected return on assets	(25)	(28)	(50)	(55)
Amortization of net loss	13	12	26	24
Net costs	17	17	35	35
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	2	3
Interest cost	7	8	13	16
Expected return on assets	(2)	(2)	(3)	(4)
Amortization of prior service cost	(4)	(5)	(8)	(10)
Amortization of net loss	5	2	9	5
Net costs	$ 7	$ 5	$ 13	$ 10

Related-Party Transactions (Nar

Related-Party Transactions (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Related Party Transaction [Line Items]
Cash payments made to (received from) members			$ 0	$ 0
Revenue from contracts	$ 1,147,000,000	$ 1,090,000,000	2,286,000,000	2,162,000,000
Purchases from related party	$ 260,000,000	$ 233,000,000	$ 509,000,000	478,000,000
Sempra Texas Holdings [Member] | Sharyland Distribution & Transmission Services (SDTS) [Member]
Related Party Transaction [Line Items]
Percentage of membership interest owned by non-controlling owners	50.00%		50.00%
Sharyland Distribution & Transmission Services (SDTS) [Member]
Related Party Transaction [Line Items]
Revenue from contracts			$ 7,000,000
Maximum [Member] | Sharyland Distribution & Transmission Services (SDTS) [Member]
Related Party Transaction [Line Items]
Substation monitoring and switching services			$ 1,000,000	$ 1,000,000

Related-Party Transactions (Sch

Related-Party Transactions (Schedule Of Amounts Payable To (Receivables From) Related Parties) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Federal income taxes payable (receivable)	$ (22)	$ (7)
Texas margin tax payable	14	23
Net payable (receivable)	(8)	16
Sempra Texas Holdings [Member]
Related Party Transaction [Line Items]
Federal income taxes payable (receivable)	(18)	(6)
Texas margin tax payable	14	23
Net payable (receivable)	(4)	17
Texas Transmission and Investment LLC [Member]
Related Party Transaction [Line Items]
Federal income taxes payable (receivable)	(4)	(1)
Net payable (receivable)	$ (4)	$ (1)

Related-Party Transactions (S_2

Related-Party Transactions (Schedule Of Cash Payments Made To (Received From) Related Parties) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021USD ($)
Related Party Transaction [Line Items]
Federal income taxes	$ 32
Texas margin tax	21
Total payments (receipts)	53
Sempra Texas Holdings [Member]
Related Party Transaction [Line Items]
Federal income taxes	26
Texas margin tax	21
Total payments (receipts)	47
Texas Transmission and Investment LLC [Member]
Related Party Transaction [Line Items]
Federal income taxes	6
Total payments (receipts)	$ 6

Supplementary Financial Infor_3

Supplementary Financial Information (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021USD ($)customer	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)customer	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)customer
Supplemental Financial Information [Line Items]
Aggregate amortization expenses	$ 18	$ 15	$ 35	$ 31
Goodwill	$ 4,740		$ 4,740		$ 4,740
Trade Accounts Receivable [Member]
Supplemental Financial Information [Line Items]
Number of largest customers | customer	2		2		2
Customers [Member] | Trade Accounts Receivable [Member] | Nonaffiliated REP [Member]
Supplemental Financial Information [Line Items]
Concentration risk percentage			22.00%		21.00%
Customers [Member] | Trade Accounts Receivable [Member] | Second Nonaffiliated REP [Member]
Supplemental Financial Information [Line Items]
Concentration risk percentage			20.00%		15.00%

Supplementary Financial Infor_4

Supplementary Financial Information (Schedule Of Other Deductions And (Income)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Supplementary Financial Information [Abstract]
Professional fees	$ 3	$ 2	$ 5	$ 3
Recoverable pension and OPEB - non-service	14	14	27	27
AFUDC equity income	(7)	(7)	(13)	(12)
Other, including interest income	(3)	1	(5)	5
Total other deductions and (income) - net	$ 7	$ 10	$ 14	$ 23

Supplementary Financial Infor_5

Supplementary Financial Information (Schedule Of Interest Expense And Related Charges) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Supplementary Financial Information [Abstract]
Interest	$ 103	$ 105	$ 205	$ 206
Amortization of debt issuance costs and discounts	3	2	6	5
Less AFUDC – capitalized interest portion	(4)	(5)	(7)	(8)
Total interest expense and related charges	$ 102	$ 102	$ 204	$ 203

Supplementary Financial Infor_6

Supplementary Financial Information (Schedule Of Trade Accounts And Other Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Supplementary Financial Information [Abstract]
Gross trade accounts and other receivables	$ 774	$ 767
Allowance for uncollectible accounts	(9)	(7)
Trade accounts receivable - net	$ 765	$ 760

Supplementary Financial Infor_7

Supplementary Financial Information (Summary of Investments And Other Property) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Supplementary Financial Information [Abstract]
Assets related to employee benefit plans	$ 131	$ 124
Land	16	16
Other	2	2
Total investments and other property	$ 149	$ 142

Supplementary Financial Infor_8

Supplementary Financial Information (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Property Plant and Equipment [Line Items]
Total assets in service	$ 29,949	$ 28,948
Less accumulated depreciation	8,543	8,336
Net of accumulated depreciation	21,406	20,612
Construction work in progress	572	593
Held for future use	20	20
Property, plant and equipment - net	21,998	21,225
Distribution [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 15,421	14,937
Composite depreciation rate	2.50%
Avg. life	39 years 6 months
Transmission [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 12,619	12,156
Composite depreciation rate	2.90%
Avg. life	34 years 8 months 12 days
Other Assets [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 1,909	$ 1,855
Composite depreciation rate	5.80%
Avg. life	17 years 4 months 24 days

Supplementary Financial Infor_9

Supplementary Financial Information (Schedule Of Intangible Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,708	$ 1,650
Accumulated Amortization	631	596
Net	1,077	1,054
Land Easements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	637	623
Accumulated Amortization	115	112
Net	522	511
Capitalized Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,071	1,027
Accumulated Amortization	516	484
Net	$ 555	$ 543

Supplementary Financial Info_10

Supplementary Financial Information (Schedule Of Estimated Aggregate Amortization Expenses) (Details) $ in Millions	Jun. 30, 2021USD ($)
Supplementary Financial Information [Abstract]
2021	$ 72
2022	73
2023	73
2024	72
2025	$ 72

Supplementary Financial Info_11

Supplementary Financial Information (Schedule Of Operating Lease, Third Party Joint Project And Other Obligations) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Supplementary Financial Information [Abstract]
Operating lease liabilities	$ 133	$ 124
Investment tax credits	5	5
Third party joint project obligation		100
Other	88	76
Total operating lease, third party joint project and other obligations	$ 226	$ 305

Supplementary Financial Info_12

Supplementary Financial Information (Schedule Of Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Supplementary Financial Information [Abstract]
Interest	$ 204	$ 198
Less capitalized interest	(7)	(8)
Interest payments (net of amounts capitalized)	197	190
Federal	32
State	21
Total payments (receipts) in lieu of income taxes	53
Noncash construction expenditures	181	242
Transfer of title to assets constructed for and prepaid by LP&L	150
ROU assets obtained in exchange for operating lease obligations	$ 29	$ 41