Oncor Electric Delivery S-4 29 Mar 22 Registration of securities issued in business combination transactions Financial data

Cover Page

Cover Page	12 Months Ended
	Dec. 31, 2021
Document Information [Line Items]
Document Type	S-4
Entity Registrant Name	Oncor Electric Delivery Company LLC
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Amendment Flag	false
Entity Central Index Key	0001193311

Statements Of Consolidated Inco

Statements Of Consolidated Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Operating revenues (Note 3)	$ 4,764	$ 4,511	$ 4,347
Operating expenses:
Wholesale transmission service	1,039	975	1,005
Operation and maintenance (Note 10)	983	925	899
Depreciation and amortization	820	786	723
Provision in lieu of income taxes (Notes 1, 4 and 10)	165	148	138
Taxes other than amounts related to income taxes	555	538	508
Total operating expenses	3,562	3,372	3,273
Operating income	1,202	1,139	1,074
Other deductions and (income) - net (Note 11)	31	33	63
Nonoperating benefit in lieu of income taxes (Note 4)	(12)	(12)	(15)
Interest expense and related charges (Note 11)	413	405	375
Net income	$ 770	$ 713	$ 651

Statements Of Consolidated Comp

Statements Of Consolidated Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 770	$ 713	$ 651
Other comprehensive income (loss):
Cash flow hedges – derivative value net gain (loss) recognized in net income (net of tax expense (benefit) of $1, ($5) and $-) (Notes 1 and 8)	3	(21)	2
Defined benefit pension plans (net of tax expense of $-, $- and $-) (Notes 8 and 9)	17	9	27
Total other comprehensive income (loss)	20	(12)	29
Comprehensive income	$ 790	$ 701	$ 680

Statements Of Consolidated Co_2

Statements Of Consolidated Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Cash flow hedges – derivative value net loss recognized in net income (net of tax expense (benefit)	$ 1	$ 5

Statements Of Consolidated Cash

Statements Of Consolidated Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows - operating activities:
Net income	$ 770	$ 713	$ 651
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization, including regulatory amortization	901	866	806
Provision in lieu of deferred income taxes - net	68	32	55
Other - net	(1)	(1)	(3)
Changes in operating assets and liabilities:
Accounts receivable - trade	37	(78)	(53)
Inventories	(27)	4	(30)
Accounts payable - trade	27	(29)	21
Regulatory accounts related to reconcilable tariffs (Note 2)	(46)	33	(44)
Other - assets	(127)	(71)	(204)
Other - liabilities	56	56	76
Cash provided by operating activities	1,658	1,525	1,275
Cash flows - financing activities:
Issuances of long-term debt (Note 6)	2,090	1,810	2,460
Repayments of long-term debt (Note 6)	(1,290)	(1,164)	(1,094)
Proceeds of business acquisition bridge loan	0	0	600
Repayment of business acquisition bridge loan	0	0	(600)
Net increase (decrease) in short-term borrowings (Note 5)	145	24	(882)
Capital contributions from members (Note 8)	705	788	1,978
Distributions to members (Note 8)	(839)	(356)	(319)
Debt discount, premium, financing and reacquisition costs - net	(9)	(54)	(39)
Cash provided by financing activities	802	1,048	2,104
Cash flows - investing activities:
Capital expenditures (Note 11)	(2,497)	(2,540)	(2,097)
Business acquisition (Note 12)	0	0	(1,324)
Expenditures for third party in joint project (Note 3)	(67)	(96)	0
Reimbursement from third party in joint project (Note 3)	99	66	0
Other - net	32	20	43
Cash used in investing activities	(2,433)	(2,550)	(3,378)
Net change in cash, cash equivalents and restricted cash	27	23	1
Cash, cash equivalents and restricted cash - beginning balance	27	4	3
Cash, cash equivalents and restricted cash - ending balance	$ 54	$ 27	$ 4

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 11	$ 27
Restricted cash, current (Note 1)	13
Trade accounts receivable – net (Note 11)	738	760
Amounts receivable from members related to income taxes (Note 10)	6	7
Materials and supplies inventories - at average cost	171	144
Prepayments and other current assets	101	100
Total current assets	1,040	1,038
Restricted cash, noncurrent (Note 1)	30
Investments and other property (Note 11)	155	142
Property, plant and equipment - net (Note 11)	22,954	21,225
Goodwill (Note 1 and 11)	4,740	4,740
Regulatory assets (Note 2)	1,547	1,779
Operating lease ROU, third-party joint project and other assets (Notes 3 and 7)	167	248
Total assets	30,633	29,172
Current liabilities:
Short-term borrowings (Note 5)	215	70
Long-term debt due currently (Note 6)	882
Trade accounts payable (Note 10)	441	392
Amounts payable to members related to income taxes (Note 10)	24	23
Accrued taxes other than amounts related to income taxes	286	269
Accrued interest	89	87
Operating lease and other current liabilities (Note 7)	283	279
Total current liabilities	2,220	1,120
Long-term debt, less amounts due currently (Note 6)	9,150	9,229
Liability in lieu of deferred income taxes (Note 1, 4 and 10)	2,065	1,923
Regulatory liabilities (Note 2)	2,876	2,855
Employee benefit obligations (Note 9)	1,503	1,808
Operating lease, third-party joint project and other obligations (Notes 3 and 11)	231	305
Total liabilities	18,045	17,240
Commitments and contingencies (Note 7)
Membership interests (Note 8):
Capital account ― number of units outstanding 2021 and 2020 – 635,000,000	12,719	12,083
Accumulated other comprehensive loss	(131)	(151)
Total membership interests	12,588	11,932
Total liabilities and membership interests	$ 30,633	$ 29,172

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - shares	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Capital account, units outstanding	635,000,000	635,000,000	635,000,000

Statements Of Consolidated Memb

Statements Of Consolidated Membership Interests - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Capital account:
Balance at beginning of period	$ 12,083	$ 10,938	$ 8,624
Net income	770	713	651
Capital contributions from members (Note 8)	705	788	1,978
Distributions to members (Note 8)	(839)	(356)	(319)
Balance at end of period	12,719	12,083	10,938
Total membership interests at end of period	12,588	11,932	10,799
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-02 [Member]
Capital account:
Balance at beginning of period	0	4
Balance at end of period	0	0	4
Accumulated Other Comprehensive Income (Loss) [Member]
Capital account:
Balance at beginning of period	(151)	(139)	(164)
Net effects of cash flow hedges (net of tax expense (benefit) of $1, ($5) and $-)	3	(21)	2
Defined benefit pension plans (net of tax expense of $-, $- and $-) (Note 9)	17	9	27
Balance at end of period	(131)	(151)	(139)
Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-02 [Member]
Capital account:
Balance at beginning of period	0	(4)
Balance at end of period	$ 0	$ 0	$ (4)

Statements Of Consolidated Me_2

Statements Of Consolidated Membership Interests (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Stockholders' Equity [Abstract]
Units outstanding	635,000,000	635,000,000
Net effects of cash flow hedges, tax expense	$ 1	$ 5

Description Of Business And Sig

Description Of Business And Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES	1. DESCRIPTION OF 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. 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 membership interests and Texas Transmission owns 19.75% of our membership interests. We are managed as an integrated business; consequently, there are no separate reportable business segments. Our consolidated financial statements include the results of our wholly owned indirect subsidiary, NTU, which we acquired as part of the InfraREIT Acquisition that closed on May 16, 2019. NTU is a regulated utility that primarily provides electricity transmission delivery service in the north-central, western and panhandle regions of Texas. 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 the 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 various approvals, including PUCT approval through the Sempra Order, which outlines certain ring-fencing measures, governance mechanisms and restrictions that apply after the Sempra 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 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 (each, an Oncor Officer Director), currently Robert S. Shapard and E. Allen Nye, Jr., who are our Chairman of our board of directors 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 In addition, the Sempra Order provides that Oncor’s board of directors cannot be overruled by the board of directors 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 members of the board of directors, provided that certain actions may also require the additional approval of the Oncor Holdings board of directors. The Sempra Order also provides that any changes to the size, composition, structure or rights of the board of directors must first be approved by the PUCT. In addition, if Sempra acquires Texas Transmission’s interest in Oncor, the two board of director 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 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 debt-to-equity debt-to-equity • 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 the closing of the Sempra Acquisition; • Neither Oncor nor Oncor Holdings will lend money to, borrow money from or 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 • Sempra will continue to hold indirectly at least 51% of the ownership interests in Oncor and Oncor Holdings for at least five years following the closing of the Sempra Acquisition, unless otherwise specifically authorized by the PUCT. Basis of Presentation 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 year. Revenue Recognition Oncor’s revenue is billed 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 including a reasonable rate of return on invested capital. Revenues are generally recognized when the underlying service has been provided in an amount prescribed by the related tariff. See Note 3 for additional information regarding revenues. Interest Rate Derivatives and Hedge Accounting We are exposed to interest rates primarily as a result of our current and expected financing activity. 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. For our annual goodwill impairment testing, we have the option to first make a qualitative assessment of whether it is more likely than not that our enterprise fair value is less than our enterprise carrying amount before applying the quantitative goodwill impairment test. If we elect to perform the qualitative assessment, we evaluate relevant events and circumstances, including but not limited to, macroeconomic conditions, industry and market considerations, cost factors and our overall financial performance. If, after assessing these qualitative factors, we determine that it is more-likely-than-not In each of 2021 and 2020, we concluded, based on a qualitative assessment, that our estimated enterprise fair value was more likely than not greater than our carrying value. As a result, no quantitative goodwill impairment tests were required and no impairment was recognized. Goodwill totaling $4.740 billion was reported on our balance sheet at both December 31, 2021 and 2020. Provision in Lieu of Income Taxes Our tax sharing agreement with Oncor Holdings, Texas Transmission and STH provides for the calculation of amounts related to income taxes for each of Oncor Holdings and Oncor substantially as if these entities were taxed as corporations and requires payments to the members determined on that basis (without duplication for any income taxes paid by a subsidiary of Oncor Holdings). We are a partnership for U.S. federal income tax purposes. Accordingly, while partnerships are not subject to income taxes, in consideration of the presentation of our financial statements as an entity subject to cost-based regulatory rate-setting processes, with such costs historically including income taxes, the financial statements present amounts determined under the tax sharing agreement as “provision in lieu of income taxes” and “liability in lieu of deferred income taxes”. Such amounts are determined in accordance with the provisions of the accounting guidance for income taxes and accounting standards that provide interpretive guidance for accounting for uncertain tax positions and thus differences between the book and tax bases of assets and liabilities are accounted for as if we were a stand-alone corporation. In the event such amounts are not paid under the tax sharing agreement, it is probable that this regulatory liability will continue to be included in Oncor’s rate setting processes. We classify any interest and penalties expense related to uncertain tax positions as current provision in lieu of income taxes as discussed in Note 4. Defined Benefit Pension Plans and OPEB Plans We have liabilities under pension plans that offer benefits based on either a traditional defined benefit formula or a cash balance formula and OPEB Plans that offer certain health care and life insurance benefits to eligible employees and their eligible dependents upon the retirement of such employees. Costs of pension and OPEB Plans are dependent upon numerous factors, assumptions and estimates. See Note 9 for additional information regarding pension and OPEB Plans. System of Accounts Our accounting records have been maintained in accordance with the FERC Uniform System of Accounts as adopted by the PUCT. Property, Plant and Equipment Properties are stated at original cost. The cost of self-constructed property additions includes materials and both direct and indirect labor and applicable overhead and an allowance for funds used during construction. Depreciation of property, plant and equipment is calculated on a straight-line basis over the estimated service lives of the properties based on depreciation rates approved by the PUCT. As is common in the industry, depreciation expense is recorded using composite depreciation rates that reflect blended estimates of the lives of major asset groups as compared to depreciation expense calculated on a component asset-by-asset Regulatory Assets and Liabilities We are subject to rate regulation and our financial statements reflect regulatory assets and liabilities in accordance with accounting standards related to the effect of certain types of regulation. Regulatory assets and liabilities represent probable future revenues that will be recovered from or refunded to customers through the ratemaking process based on PURA and/or the PUCT’s orders, precedents or substantive rules. Rate regulation is premised on the full recovery of prudently incurred costs and a reasonable rate of return on invested capital subject to PUCT review for reasonableness. Regulatory decisions can have an impact on the recovery of costs, the rate earned on invested capital and the timing and amount of assets to be recovered by rates. See Note 2 for more information regarding regulatory assets and liabilities. Franchise Taxes Franchise taxes are assessed to us by local governmental bodies, based on kWh delivered and are a principal component of taxes other than amounts related to income taxes as reported in the income statement. Franchise taxes 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. Allowance for Funds Used During Construction AFUDC is a regulatory cost accounting procedure whereby both interest charges on borrowed funds and a return on equity capital used to finance construction are included in the recorded cost of utility plant and equipment being constructed. AFUDC is capitalized on all projects involving construction periods lasting greater than thirty days. The interest portion of capitalized AFUDC is accounted for as a reduction to interest expense and the equity portion of capitalized AFUDC is accounted for as other income. See Note 11 for detail of amounts reducing interest expense and increasing other income. Cash, Cash Equivalents and Restricted Cash For purposes of reporting cash and cash equivalents, highly liquid investments with original maturities of three months or less at the date of purchase are considered to be cash equivalents. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported on the Consolidated Balance Sheets to the sum of such amounts reported on the Statements of Consolidated Cash Flows: At December 31, 2021 2020 Cash, cash equivalents and restricted cash Cash and cash equivalents $ 11 $ 27 Restricted cash, current (a) 13 — Restricted cash, noncurrent (a) 30 — Total cash, cash equivalents and restricted cash on the Statements of Consolidated Cash Flows $ 54 $ 27 (a) Restricted cash represents amounts deposited with Oncor, by our customers, but subject to return in accordance with the PUCT rules, ERCOT requirement or our tariffs, relating to generation interconnection and construction and/or extension of electric delivery system facilities. We maintain these amounts in a separate escrow account. Fair Value of Nonderivative Financial Instruments The carrying amounts for financial assets classified as current assets and the carrying amounts for financial liabilities classified as current liabilities approximate fair value due to the short maturity of such instruments. The fair values of other financial instruments, for which carrying amounts and fair values have not been presented, are not materially different than their related carrying amounts. The following discussion of fair value accounting standards applies primarily to our determination of the fair value of assets in the pension and OPEB Plans’ trusts (see Note 9) and long-term debt (see Note 6). Accounting standards related to the determination of fair value define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. We use a “mid-market” mid-point We categorize our assets and liabilities recorded at fair value based upon the following fair value hierarchy: • Level 1 valuations use quoted prices in active markets for identical assets or liabilities that are accessible at the measurement date. An active market is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis. • Level 2 valuations use inputs that, in the absence of actively quoted market prices, are observable for the asset or liability, either directly or indirectly. Level 2 inputs include: (a) quoted prices for similar assets or liabilities in active markets, (b) quoted prices for identical or similar assets or liabilities in markets that are not active, (c) inputs other than quoted prices that are observable for the asset or liability such as interest rates and yield curves observable at commonly quoted intervals and (d) inputs that are derived principally from or corroborated by observable market data by correlation or other means. Our Level 2 valuations utilize over-the-counter • Level 3 valuations use unobservable inputs for the asset or liability. Unobservable inputs are used to the extent observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date. We use the most meaningful information available from the market combined with internally developed valuation methodologies to develop our best estimate of fair value. We utilize several different valuation techniques to measure the fair value of assets and liabilities, relying primarily on the market approach of using prices and other market information for identical and/or comparable assets and liabilities for those items that are measured on a recurring basis. The fair value of certain investments is measured using the net asset value (NAV) per share as a practical expedient. Such investments measured at NAV are not required to be categorized within the fair value hierarchy. Derivative Instruments and Mark-to-Market From time-to-time “mark-to-market” Contingencies Our financial results may be affected by judgments and estimates related to contingencies. For loss contingencies, we accrue the loss if an event has occurred on or before the balance sheet date, and: • information available through the date we file our financial statements indicates it is probable that a loss has been incurred, given the likelihood of uncertain future events; and • the amount of the loss can be reasonably estimated. We do not accrue contingencies that might result in gains. We continuously assess contingencies for litigation claims, environmental remediation and other events. See Note 7 for a discussion of contingencies. Effects of Reference Rate Reform on Financial Reporting Our Credit Facility uses LIBOR as a benchmark for establishing interest rates but incorporates a transition mechanism for the phase-out phase-out No. 2020-04.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2021
Regulated Operations [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 December 31, 2021 are provided in the table below. Amounts not earning a return through rate regulation are noted. Remaining Rate December 31, 2021 At December 31, 2021 2020 Regulatory assets: Employee retirement liability (a)(b)(c) To be determined $ 328 $ 672 Employee retirement costs being amortized 6 years 193 227 Employee retirement costs incurred since the last rate review period (b) To be determined 99 67 Self-insurance reserve (primarily storm recovery costs) being amortized 6 years 223 266 Self-insurance reserve incurred since the last rate review period (primarily storm related) (b) To be determined 373 256 Debt reacquisition costs Lives of related debt 19 25 Under-recovered AMS costs 6 years 128 149 Energy efficiency performance bonus (a) 1 year or less 31 14 Wholesale distribution substation service To be determined 75 55 Unrecovered expenses related to COVID-19 To be determined 35 27 Recoverable deferred income taxes—net Various 16 9 Uncollectible payments from REPs (b) To be determined 9 — Other regulatory assets Various 18 12 Total regulatory assets 1,547 1,779 Regulatory liabilities: Estimated net removal costs Lives of related assets 1,348 1,262 Excess deferred taxes Primarily over lives of related assets 1,442 1,508 Over-recovered wholesale transmission service expense (a) 1 year or less 7 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 39 — Other regulatory liabilities Various 14 6 Total regulatory liabilities 2,876 2,855 Net regulatory assets (liabilities) $ (1,329 ) $ (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 COVID-19 COVID-19

Revenues

Revenues	12 Months Ended
	Dec. 31, 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 energy efficiency program performance bonuses by exceeding PURA-mandated 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. The PUCT approved bonuses of $31 million and $14 million that we recognized in revenues in 2021 and 2020, respectively. Disaggregation of Revenues The following table reflects electric delivery revenues disaggregated by tariff: Year Ended December 31, 2021 2020 2019 Operating revenues Revenues contributing to earnings: Distribution base revenues $ 2,217 $ 2,156 $ 2,143 Transmission base revenues (TCOS revenues) Billed to third-party wholesale customers 879 803 681 Billed to REPs serving Oncor distribution customers, through TCRF 479 446 391 Total transmission base revenues 1,358 1,249 1,072 Other miscellaneous revenues 104 87 77 Total revenues contributing to earnings 3,679 3,492 3,292 Revenues collected for pass-through expenses: TCRF—third-party wholesale transmission service 1,039 975 1,005 EECRF 46 44 50 Revenues collected for pass-through expenses 1,085 1,019 1,055 Total operating revenues $ 4,764 $ 4,511 $ 4,347 Customers Our distribution business customers consist of REPs (approximately 95 at December 31, 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 benefitting from our transmission system. Our transmission business customers consist of municipalities, electric cooperatives and other distribution companies. REP subsidiaries of our two largest customers collectively represented 25% and 23% of our total operating revenues for the year ended 2021, 25% and 18% for the year ended 2020 and 23% and 18% for the year ended 2019. No other customer represented more than 10% of our total operating revenues. Variability Our revenues and cash flows are subject to seasonality, timing of customer billings, weather conditions and other electricity usage drivers, with revenues being highest in the summer. Payment 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. Lubbock Joint Project with LP&L Oncor completed an approximately $370 million joint project with LP&L in 2021. The project involved the build out of approximately 175 miles of transmission lines and associated station work in Lubbock and the 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.

Provision In Lieu Of Income Tax

Provision In Lieu Of Income Taxes	12 Months Ended
	Dec. 31, 2021
Provision In Lieu Of Income Taxes [Abstract]
PROVISION IN LIEU OF INCOME TAXES	4. PROVISION IN LIEU OF INCOME TAXES Components of Liability in Lieu of Deferred Income Taxes The components of our liability in lieu of deferred income taxes are provided in the table below. At December 31, 2021 2020 Deferred Tax Related Assets: Employee benefit liabilities $ 253 $ 233 Regulatory liabilities 45 48 Other 45 47 Total 343 328 Deferred Tax Related Liabilities: Property, plant and equipment 2,132 1,994 Regulatory assets 274 255 Other 2 2 Total 2,408 2,251 Liability in lieu of d e $2,065 $1,923 Provision (Benefit) in Lieu of Income Taxes The components of our reported provision (benefit) in lieu of income taxes are as follows: Year Ended December 31, 2021 2020 2019 Reported in operating expenses: Current: U.S. federal $ 79 $ 100 $ 69 State 24 22 22 Deferred: U.S. federal 63 27 49 Amortization of investment tax credits (1 ) (1 ) (2 ) Total reported in operating expenses 165 148 138 Reported in other income and deductions: Current: U.S. federal (17 ) (17 ) (21 ) Deferred federal 5 5 6 Total reported in other income and deductions (12 ) (12 ) (15 ) Total provision in lieu of income taxes $ 153 $ 136 $ 123 Reconciliation of provision in lieu of income taxes computed at the U.S. federal statutory rate to provision in lieu of income taxes: Year Ended December 31, 2021 2020 2019 Income before provision in lieu of income taxes $ 923 $ 849 $ 774 Provision in lieu of income taxes at the U.S. federal statutory rate of 21% $ 194 $ 178 $ 163 Amortization of investment tax credits—net of deferred tax effect (1 ) (1 ) (2 ) Amortization of excess deferred taxes (52 ) (52 ) (52 ) Texas margin tax, net of federal tax benefit 19 18 17 Nontaxable gains on benefit plan investments (3 ) (2 ) (2 ) Other (4 ) (5 ) (1 ) Reported provision in lieu of income taxes $ 153 $ 136 $ 123 Effective rate 16.6 % 16.0 % 15.9 % The net amounts of $2.065 billion and $1.923 billion reported in the balance sheets at December 31, 2021 and 2020, respectively, as liability in lieu of deferred income taxes include amounts previously recorded as net deferred tax liabilities. In connection with the sale of equity interests to Texas Transmission in 2008, we became a partnership for U.S. federal income tax purposes, and the temporary differences that gave rise to the deferred taxes will, over time, become taxable to the equity holders. Under a tax sharing agreement among us and our equity holders (see Note 1), we make payments to the equity holders related to income taxes when amounts would have become due to the IRS if Oncor was taxed as a corporation. Accordingly, as the temporary differences become taxable, we will pay the equity holders. In the event such amounts are not paid under the tax sharing agreement, it is probable that this regulatory liability will continue to be included in Oncor’s rate setting processes. Accounting For Uncertainty in Provision in Lieu of Income Taxes The statute of limitations is open for our partnership tax returns for the years beginning after December 31, 2017. Texas margin tax returns are under examination or still open for examination for tax years beginning after 2016. We are not a member of any consolidated federal tax group and assess our liability for uncertain tax positions in our partnership returns. We had a negligible amount of uncertain tax positions in 2021 and none in 2020. Noncurrent liabilities included a negligible amount of accrued interest related to uncertain tax positions at D e

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2021
Short-Term Borrowings [Abstract]
SHORT-TERM BORROWINGS	5. SHORT-TERM BORROWINGS At December 31, 2021 and 2020, outstanding short-term borrowings under our Credit Facility and CP Program consisted of the following: At December 31, 2021 2020 Total credit facility borrowing capacity $ 2,000 $ 2,000 Credit facility outstanding borrowings — — Commercial paper outstanding (a) (215 ) (70 ) Letters of credit outstanding (b) (8 ) (9 ) Available unused credit $1,777 $1,921 (a) The weighted average interest rates for commercial paper were 0.30% and 0.17% at December 31, 2021 and December 31, 2020, respectively. (b) Interest rates on outstanding letters of credit at December 31, 2021 and December 31, 2020 were 1.20% and 1.45%, respectively, based on our credit ratings. Credit Facility In November 2021, we entered into a $2.0 billion unsecured revolving Credit Facility that includes sustainability-linked pricing metrics related to specific environmental and employee health and safety sustainability objectives. The Credit Facility may be used for working capital and general corporate purposes, issuances of letters of credit and to support our CP Program. The Credit Facility has a maturity date of November 9, 2026. We also have the option of requesting up to two 1-year Loans under the Credit Facility bear interest at per annum rates equal to, at our option, (i) adjusted LIBOR plus an applicable margin of between 0.875% and 1.50%, depending on certain credit ratings assigned to our debt, or (ii) an alternate base rate (equal to the higher of (1) the prime rate of the administrative agent, (2) the greater of the federal funds effective rate or the overnight bank funding rate, plus 0.50%, and (3) adjusted LIBOR plus 1.00%) plus an applicable margin of between 0.00% and 0.50%, depending on certain credit ratings assigned to our debt. Based on our current debt ratings as of February 25, 2022, our LIBOR-based borrowings will bear interest at adjusted LIBOR plus 1.00% and our alternate base rate borrowings will bear interest at the alternate base rate plus 0.00%. The Credit Facility provides for an alternative rate of interest upon the occurrence of certain events related to the phase out of LIBOR. A commitment fee is payable quarterly in arrears and upon termination or commitment reduction at a rate per annum equal to between 0.075% and 0.225% (such spread shall depend on the credit ratings assigned to our debt) of the commitments under the Credit Facility. Based on our current debt ratings, the commitment fee will be 0.10%. Letter of credit fees under the Credit Facility are payable quarterly in arrears and upon termination at a rate per annum equal to the spread over adjusted LIBOR under the Credit Facility. Fronting fees in an amount as separately agreed by Oncor and any fronting bank that issues a letter of credit are also payable quarterly in arrears and upon termination to each such fronting bank. The Credit Facility includes sustainability-linked pricing metrics related to specific environmental and employee health and safety sustainability objectives. The Credit Facility provides that the applicable margin and commitment fee may be increased, decreased or have no change depending on our annual performance on the two sustainability-linked pricing metrics set forth in the Credit Facility. The maximum pricing adjustment in any given year is +/- 0.01% on the commitment fee and +/- 0.05% on the applicable margin. The Credit Facility requires that we maintain a maximum consolidated senior debt to capitalization ratio of 0.65 to 1.00 and observe certain customary reporting requirements and other affirmative covenants. At December 31, 2021, we were in compliance with these covenants. The Credit Facility also contains customary events of default for facilities of this type, the occurrence of which would allow the lenders to accelerate all outstanding loans and terminate their commitments, including certain changes in control of Oncor that are not permitted transactions under the Credit Facility and cross-default provisions in the event Oncor or any of its subsidiaries defaults on indebtedness in a principal amount in excess of $100 million or receives judgments for the payment of money in excess of $100 million that are not discharged or stayed within 60 days. CP Program In March 2018, we established the CP Program, under which we may issue unsecured 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 above. We may utilize either the CP Program or the Credit Facility at our option, to meet our funding needs.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2021
Long-Term Debt [Abstract]
LONG-TERM DEBT	6. LONG-TERM DEBT Our long-term debt at December 31, 2021 consisted solely of fixed rate secured debt. Our secured debt is secured equally and ratably by a first priority lien on certain transmission and distribution assets. See “Deed of Trust” below for additional information. At December 31, 2021 and 2020, our long-term debt consisted of the following: 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 700 400 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 2.70% Senior Notes due November 15, 2051 500 — 5.35% Senior Notes due October 1, 2052 300 300 Total long-term debt 10,127 9,327 Unamortized discount and debt issuance costs (95 ) (98 ) Less amount due currently (882 ) — Long-term debt, less amounts due currently $ 9,150 $ 9,229 Long-Term Debt-Related Activity in 2021 Term Loan Credit Agreements 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). The January 2021 Term Loan Credit Agreement had a maturity date of February 28, 2022. Under the January 2021 Term Loan Credit Agreement, we borrowed $160 million on January 29, 2021 and $140 million on February 26, 2021. The proceeds from each borrowing were used for general corporate purposes. Loans under the January 2021 Term Loan Credit Agreement bore 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 the lender, (2) the federal funds effective rate plus 0.50%, and (3) daily 1-month March 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). The March 2021 Term Loan Credit Agreement had a maturity date of May 17, 2022. Under the March 2021 Term Loan Credit Agreement, we borrowed $170 million on March 31, 2021, $105 million on April 30, 2021 and $175 million on May 14, 2021. The proceeds from each borrowing were used for general corporate purposes. Loans under the March 2021 Term Loan Credit Agreement bore 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 the administrative agent, (2) the federal funds effective rate plus 0.50%, and (3) daily 1-month 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). The June 2021 Term Loan Credit Agreement had a maturity date of August 15, 2022. Under the June 2021 Term Loan Credit Agreement, we borrowed $20 million on June 29, 2021 and $520 million on July 28, 2021. The proceeds from each borrowing were used for general corporate purposes. Loans under the June 2021 Term Loan Credit Agreement bore 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 the administrative agent, (2) the federal funds effective rate plus 0.50%, and (3) daily 1-month Senior Secured Notes 2030 Notes and 2051 Notes Issuances On November 16, 2021, we issued $300 million aggregate principal amount of 2.75% Senior Secured Notes due May 15, 2030 (2030 Notes) and $500 million aggregate principal amount of 2.70% Senior Secured Notes due November 15, 2051 (2051 Notes). The 2030 Notes constitute an additional issuance of our 2.75% Senior Secured Notes due May 15, 2030, $400 million of which we previously issued on March 20, 2020 and are currently outstanding. As a result of this additional issuance, at December 31, 2021, the aggregate principal amount of 2030 Notes outstanding was $700 million. We used the proceeds from the issuance of the 2030 Notes issued in November 2021 and the 2051 Notes for general corporate purposes, including the repayment of the aggregate principal amounts outstanding under the January 2021 Term Loan Credit Agreement and the March 2021 Term Loan Credit Agreement, as well as a portion of the aggregate principal amount outstanding under the June 2021 Term Loan Credit Agreement. The 2030 Notes and 2051 Notes were issued pursuant to the provisions of an Indenture, dated as of August 1, 2002, between Oncor and The Bank of New York Mellon Trust Company, N.A. (as successor to The Bank of New York Mellon, formerly The Bank of New York), as amended and supplemented. The 2030 Notes bear interest at a rate of 2.75% per annum and mature on May 15, 2030. The 2051 Notes bear interest at a rate of 2.70% per annum and mature on November 15, 2051. Interest on the 2030 Notes issued in November 2021 accrued from November 15, 2021 and will be payable semi-annually on May 15 and November 15 of each year, beginning on May 15, 2022. Interest on the 2051 Notes accrued from November 16, 2021 and will be payable semi-annually on May 15 and November 15 of each year, beginning on May 15, 2022. Prior to February 15, 2030 in the case of the 2030 Notes and May 15, 2051 in the case of the 2051 Notes, we may redeem such notes at any time, in whole or in part, at a price equal to 100% of their principal amount, plus accrued and unpaid interest and a “make-whole” premium. On and after February 15, 2030 in the case of the 2030 Notes and May 15, 2051 in the case of the 2051 Notes, we may redeem such notes at any time, in whole or in part, at a redemption price equal to 100% of the principal amount of such notes, plus accrued and unpaid interest. The 2030 Notes and 2051 Notes were issued in a private placement and were not registered under the Securities Act. In connection with the completion of the sale of the notes, on November 16, 2021, we entered into a Registration Rights Agreement with the representatives of the initial purchasers of such notes (the Registration Rights Agreement). Under the Registration Rights Agreement, we agreed, subject to certain exceptions, to file a registration statement with the SEC with respect to a registered offer to exchange the 2030 Notes issued in November 2021 and 2051 Notes for publicly registered notes, or under certain circumstances, a shelf registration statement, and cause that registration statement to be declared effective under the Securities Act no later than 270 days after the issue date of such notes and to consummate the exchange offer no later than 315 days after the issue date of such notes or, in the case of a shelf registration statement, cause it to be declared effective within the later of 180 days after the shelf registration statement obligation arises or 270 days after the issue date of the notes. If we do not comply with certain of our obligations under the Registration Rights Agreement, the affected notes will bear additional interest on the principal amount of the affected notes at a rate of 0.50% per annum over the interest rate otherwise provided for under the notes for the period during which the registration default continues, but not later than the second anniversary of the issue date of the notes. Long-Term Debt-Related Activity in 2022 Term Loan Credit Agreements January 2022 Term Loan Credit Agreement On January 28, 2022, we entered into an unsecured $1.3 billion term loan credit agreement (January 2022 Term Loan Credit Agreement). The January 2022 Term Loan Credit Agreement matures on April 29, 2023, and provides that we can borrow up to the full amount in up to four borrowings, at our option, at any time before April 28, 2022. We intend to use the proceeds from any borrowing under the January 2022 Term Loan Credit Agreement for working capital and other general corporate purposes. Loans under the January 2022 Term Loan Credit Agreement bear interest, at our option, at either (i) an adjusted term SOFR (calculated based on one-month On January 28, 2022, we borrowed $400 million under the January 2022 Term Loan Credit Agreement, the proceeds of which were used for general corporate purposes, including to repay outstanding CP Notes. On February 23, 2022, we submitted an irrevocable notice under the January 2022 Term Loan Credit Agreement for a $600 million borrowing to be made on February 28, 2022. We intend to use the proceeds from the February 2022 borrowing for general corporate purposes, including to repay outstanding CP Notes and redeem on March 1, 2022, $400 million aggregate principal amount outstanding of our 4.10% Senior Secured Notes due 2022 (the 2022 Notes), plus accrued and unpaid interest. Following the February 2022 borrowing, $300 million will be available for borrowing under the January 2022 Term Loan Credit Agreement. Senior Secured Notes 2022 Notes Redemption On January 28, 2022, the trustee under the indenture governing the 2022 Notes delivered a notice of redemption on our behalf to the holders of our outstanding 2022 Notes. The 2022 Notes mature on June 1, 2022. The notice provides that we will redeem all $400 million aggregate principal amount outstanding of the 2022 Notes. The redemption date will be March 1, 2022 and the redemption price will be equal to 100% of the principal amount of the 2022 Notes, plus accrued interest to, but not including, the redemption date. Upon the redemption of the 2022 Notes, none of the 2022 Notes will remain outstanding. Deed of Trust Our secured debt is secured equally and ratably by a first priority lien on all property acquired or constructed by Oncor for use in its electricity transmission and distribution business, subject to certain exceptions. 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 December 31, 2021, the amount of available bond credits was $2.112 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 $4.367 billion. Borrowings under the Credit Facility, the CP Program, and term loan credit agreements are not secured. Maturities Long-term debt maturities at December 31, 2021, are as follows: Year Amount 2022 $ 882 2023 — 2024 500 2025 974 2026 38 Thereafter 7,733 Unamortized discount and debt issuance costs (95 ) Total $ 10,032 Fair Value of Long-Term Debt At December 31, 2021 and 2020, the estimated fair value of our long-term debt (including current maturities) totaled $11.758 billion and $11.638 billion, respectively, and the carrying amount totaled $10.032 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	12 Months Ended
	Dec. 31, 2021
Commitments And Contingencies [Abstract]
COMMITMENTS AND CONTINGENCIES	7.COMMITMENTS AND CONTINGENCIES Leases General A lease exists when a contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. As lessee, our leased assets primarily consist of our vehicle fleet and real estate leased for company offices and service centers. Our leases are accounted for as operating leases for GAAP purposes. At December 31, 2021 we had $3 million in GAAP operating leases that are treated as capital leases solely for rate-making purposes. We generally recognize operating lease costs on a straight-line basis over the lease term in operating expenses. We are not a lessor to any material lease contracts. As of the lease commencement date, we recognize a lease liability for our obligation to make lease payments, which we initially measure at present value using our incremental borrowing rate at the date of lease commencement, unless the rate implicit in the lease is readily determinable. We determine our incremental borrowing rate based on the rate of interest that we would have to pay to borrow an amount equal to the lease payments on a collateralized basis over a similar term in a similar economic environment. We also record a ROU asset for our right to use the underlying asset, which is initially equal to the lease liability and adjusted for any lease payments made at or before lease commencement, lease incentives and any initial direct costs. Some of our lease agreements contain nonlease components, which represent items or activities that transfer a good or service. We separate lease components from nonlease components, if any, for our fleet vehicle and real estate leases for purposes of calculating the related lease liability and ROU asset. Certain of our leases include options to extend the lease terms for up to 20 years, while others include options to terminate early. Our lease liabilities and ROU assets are based on lease terms that may include such options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Short-term Leases Some of our contracts are short-term leases, which have a lease term of 12 months or less at lease commencement. As allowed by GAAP, we do not recognize a lease liability or ROU ass e Lease Obligations, Lease Costs and Other Supplemental Data The following tables summarize lease information on the consolidated balance sheet at December 31, 2021 and 2020. At December 31, 2021 2020 Operating Leases: ROU assets: Operating lease ROU, third-party joint project and other assets $ 146 $ 132 Lease liabilities: Operating lease and other current liabilities $ 37 $ 29 Operating lease, third-party joint project and other obligations 133 124 Total operating lease liabilities $170 $153 Weighted-average remaining lease term (in years) 7 7 Weighted-average discount rate 2.5 % 2.8 % The components of lease costs and cash paid for amounts included in the measurement of lease liabilities in 2021, 2020 and 2019 were as follows: Year Ended December 31, 2021 2020 2019 Operating lease cost: Operating lease costs (including amounts allocated to property, plant and equipment) $ 51 $ 42 $ 40 Short-term lease costs 11 10 34 Total operating lease costs $ 62 $ 52 $ 74 Operating lease payments: Cash paid for amounts included in the measurement of lease liabilities $ 40 $ 35 $ 32 The table below presents the maturity analysis of our lease liabilities and reconciliation to the present value of lease liabilities: Year Amount 2022 $ 40 2023 32 2024 25 2025 17 2026 10 Thereafter 56 Total undiscounted lease payments 180 Less imputed interest (10 ) Total operating lease obligations $ 170 Capital Expenditures As part of the Sempra Acquisition, Oncor has committed to make minimum aggregate capital expenditures equal to at least $7.5 billion over the five year period ending December 31, 2022. Our capital expenditures from January 1, 2018 to December 31, 2021 totaled $8.9 billion. Sales and Use Tax Audits We are subject to sales and use tax audits in the normal course of business. We are currently subject to sales and use tax audits conducted by the Texas State Comptroller’s office for audit periods 2010 through June 2013, July 2013 through 2017 and 2018 through 2021. No audit reports have been issued for these audits. While the outcome is uncertain, based on our analysis, the ultimate resolution of these audits should not have a material adverse effect on our financial position, results of operations, or cash flows. Energy Efficiency Spending We are required to annually invest in programs designed to improve customer electricity demand efficiencies to satisfy ongoing regulatory requirements. The requirement for the year 2022 is $49 million, which is recoverable through EECRF rates. 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. Labor Contracts At December 31, 2021, approximately 17% of our full time employees were represented by a labor union and covered by a collective bargaining agreement that expires in October 2022 Environmental Contingencies We must comply with environmental laws and regulations applicable to the handling and disposal of hazardous waste. We are in compliance with all current laws and regulations; however, the impact, if any, of changes to existing regulations or the implementation of new regulations is not determinable. The costs to comply with environmental regulations can be significantly affected by the following external events or conditions: • changes to existing state or federal regulation by governmental authorities having jurisdiction over control of toxic substances and hazardous and solid wastes, and other environmental matters, and • the identification of additional sites requiring clean-up We have not identified any significant potential environmental liabilities at this time.

Membership Interests

Membership Interests	12 Months Ended
	Dec. 31, 2021
Membership Interests [Abstract]
MEMBERSHIP INTERESTS	8. MEMBERSHIP INTERESTS Contributions On February 17, 2022, we received cash capital contributions from our members totaling $106 million. During 2021, we received the following cash capital contributions from our members. Receipt Date Amount February 16, 2021 $ 63 April 27, 2021 $ 63 July 27, 2021 $ 62 October 26, 2021 $ 67 December 22, 2021 $ 450 Distributions Distributions are limited by the requirement to maintain our regulatory capital structure at or below the debt-to-equity debt-to-equity The PUCT order issued in the Sempra Acquisition 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 debt-to-equity On February 18, 2022, our board of directors declared a cash distribution of $106 million, which was paid to our members on February 18, 2022. During 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 July 28, 2021 July 29, 2021 $ 546 October 27, 2021 October 28, 2021 $ 101 Accumulated Other Comprehensive Income (Loss) (AOCI) The following table presents the changes to AOCI for the years ended December 31, 2021, 2020 and 2019 net of tax. Cash Flow Defined Benefit Accumulated Other Balance at December 31, 2018 $ (16 ) $ (148 ) $ (164 ) Defined benefit pension plans — 27 27 Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax expense $-) 2 — 2 Amounts reclassified from accumulated other comprehensive income (loss) to capital account (4 ) — (4 ) Balance at December 31, 2019 $ (18 ) $ (121 ) $ (139 ) Defined benefit pension plans — 9 9 Cash flow hedges—net decrease in fair value of derivatives (net of tax benefit of $6) (24 ) — (24 ) Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax expense $1) 3 — 3 Balance at December 31, 2020 $ (39 ) $ (112 ) $ (151 ) Defined benefit pension plans — 17 17 Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax expense $-) 3 — 3 Balance at December 31, 2021 $ (36 ) $ (95 ) $ (131 )

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLANS	9. EMPLOYEE BENEFIT PLANS Regulatory Recovery of Pension and OPEB Costs PURA provides for our recovery of pension and OPEB costs applicable to services of our active and retired employees, as well as services of certain EFH Corp./Vistra active and retired employees for periods prior to the deregulation and disaggregation of EFH Corp.’s electric utility businesses effective January 1, 2002 (recoverable service). Accordingly, in 2005, we entered into an agreement with a predecessor of EFH Corp. whereby we assumed responsibility for applicable pension and OPEB costs related to those personnel’s recoverable service. We subsequently entered into agreements with EFH Corp. and a Vistra affiliate regarding provision of these benefits. Pursuant to our agreement with the Vistra affiliate, we sponsor an OPEB plan that provides certain retirement healthcare and life insurance benefits to eligible former Oncor, EFH Corp. and Vistra employees for whom both Oncor and Vistra bear a portion of the benefit responsibility. See “OPEB Plans” below for more information. We are authorized to establish a regulatory asset or liability for the difference between the amounts of pension and OPEB costs approved in current billing rates and the actual amounts that would otherwise have been recorded as charges or credits to earnings related to recoverable service. Amounts deferred are ultimately subject to regulatory approval. At December 31, 2021 and 2020, we had recorded net regulatory assets totaling $581 million and $966 million, respectively, related to pension and OPEB costs, including amounts related to deferred expenses as well as amounts related to unfunded liabilities that otherwise would be recorded as other comprehensive income. We have also assumed primary responsibility for pension benefits of a closed group of retired and terminated vested plan participants not related to our regulated utility business (non-recoverable non-recoverable 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 Code, and are subject to the provisions of ERISA. Employees do not contribute to either plan. These pension plans provide benefits to participants under one of two formulas: (i) a Cash Balance Formula under which participants earn monthly contribution credits based on their compensation and a combination of their age and years of service, plus monthly interest credits or (ii) a Traditional Retirement Plan Formula based on years of service and the average earnings of the three years of highest earnings. The interest component of the Cash Balance Formula is variable and is determined using the yield on 30-year All eligible employees hired after January 1, 2001 participate under the Cash Balance Formula. Certain employees, who, prior to January 1, 2002, participated under the Traditional Retirement Plan Formula, continue their participation under that formula. It is Oncor’s policy to fund its plans on a current basis to the extent required under existing federal tax and ERISA regulations. We also have the Supplemental Retirement Plan for certain employees whose retirement benefits cannot be fully earned under the qualified retirement plan. Supplemental Retirement Plan amounts are included in the reported pension amounts below. At December 31, 2021, the pension plans’ projected benefit obligation included a net actuarial gain of $95 million for 2021 due primarily to an increase in the discount rate. Actual returns on the plans’ assets in 2021 were more than the expected return on the plans’ assets by $69 million. We expect the pension plans’ amortizations of net actuarial losses to be $32 million in 2022. OPEB Plans We currently sponsor two OPEB Plans. One plan covers our eligible current and future retirees whose services are 100% attributed to the regulated business. Effective January 1, 2018, we established a second plan to cover eligible retirees of Oncor and EFH Corp./Vistra whose employment services were assigned to both Oncor (or a predecessor regulated utility business) and the non-regulated Oncor’s contribution policy for the OPEB Plans is to place in irrevocable external trusts dedicated to the payment of OPEB expenses an amount at least equal to the OPEB expense recovered in rates. At December 31, 2021, the OPEB Plans’ projected benefit obligation included a net actuarial gain of $136 million for 2021, including a $108 million gain associated with updates to census data, health care claims and trend assumptions and a $36 million gain due to an increase in discount rates, offset by a loss of $8 million associated with mortality and other demographic assumption changes. Actual returns on OPEB Plans’ assets in 2021 were more than the expected return on OPEB Plans’ assets by $6 million. We expect the OPEB Plans’ amortizations of net actuarial gains to be $1 million in 2022. Pension and OPEB Costs Recognized as Expense Pension and OPEB amounts provided herein include amounts related only to our obligations with respect to the various plans based on actuarial computations and reflect our employee and retiree demographics as described above. Our net costs related to pension and the OPEB Plans were comprised of the following: Year Ended December 31, 2021 2020 2019 Pension costs $ 70 $ 71 $ 63 OPEB costs 25 19 41 Total benefit costs 95 90 104 Less amounts recognized principally as property, regulatory asset or regulatory liability (19 ) (13 ) (27 ) Net amounts recognized as operation and maintenance expense or other deductions $ 76 $ 77 $ 77 The calculated value method is used to determine the market-related value of the assets held in the trust for purposes of calculating our pension costs. Realized and unrealized gains or losses in the market-related value of assets are included over a rolling four-year period. Each year, 25% of such gains and losses for the current year and for each of the preceding three years is included in the market-related value. Each year, the market-related value of assets is increased for contributions to the plan and investment income and is decreased for benefit payments and expenses for that year. The fair value method is used to determine the market-related value of the assets held in the trust for purposes of calculating OPEB cost. Detailed Information Regarding Pension and OPEB Benefits The following pension and OPEB Plans information is based on December 31, 2021, 2020 and 2019 measurement dates: Pension Plans OPEB Plans Year Ended December 31, Year Ended December 31, 2021 2020 2019 2021 2020 2019 Assumptions Used to Determine Net Periodic Pension and OPEB Costs: Discount rate 2.40 % 3.13 % 4.18 % 2.58 % 3.29 % 4.41 % Expected return on plan assets 4.35 % 4.94 % 5.42 % 5.24 % 5.90 % 6.19 % Rate of compensation increase 4.80 % 4.64 % 4.53 % — — — Components of Net Pension and OPEB Costs: Service cost $ 33 $ 29 $ 25 $ 5 $ 6 $ 6 Interest cost 84 103 128 26 32 43 Expected return on assets (99 ) (109 ) (119 ) (7 ) (8 ) (7 ) Amortization of prior service cost (credit) — — — (17 ) (20 ) (20 ) Amortization of net loss 52 48 29 18 10 19 Curtailment cost (credit) — — — — (1 ) — Net periodic pension and OPEB costs $ 70 $ 71 $ 63 $ 25 $ 19 $ 41 Other Changes in Plan Assets and Benefit Obligations Recognized as Regulatory Assets or in Other Comprehensive Income: Curtailment $ — $ — $ — $ — $ 2 $ — Net loss (gain) (164 ) 61 — (142 ) 14 (22 ) Amortization of net loss (52 ) (48 ) (29 ) (18 ) (10 ) (19 ) Amortization of prior service (cost) credit — — — 17 20 20 Total recognized as regulatory assets or other comprehensive income (216 ) 13 (29 ) (143 ) 26 (21 ) Total recognized in net periodic pension and OPEB costs and as regulatory assets or other comprehensive income $ (146 ) $ 84 $ 34 $ (118 ) $ 45 $ 20 Pension Plans OPEB Plans Year Ended December 31, Year Ended December 31, 2021 2020 2019 2021 2020 2019 Assumptions Used to Determine Benefit Obligations at Period End: Discount rate 2.75 % 2.40 % 3.13 % 2.91 % 2.58 % 3.29 % Rate of compensation increase 4.98 % 4.80 % 4.64 % — — — Pension Plans OPEB Plans Year Ended December 31, Year Ended December 31, 2021 2020 2019 2021 2020 2019 Change in Projected Benefit Obligation: Projected benefit obligation at beginning of year $ 3,596 $ 3,400 $ 3,162 $ 1,013 $ 999 $ 1,006 Service cost 33 29 25 5 6 6 Interest cost 84 103 128 26 32 43 Participant contributions — — — 19 18 19 Actuarial loss (gain) (95 ) 302 367 (136 ) 20 (5 ) Benefits paid (171 ) (165 ) (164 ) (66 ) (63 ) (70 ) Curtailment — — — — 1 — Settlements (89 ) (73 ) (118 ) — — — Projected benefit obligation at end of year $ 3,358 $ 3,596 $ 3,400 $ 861 $ 1,013 $ 999 Accumulated benefit obligation at end of year $ 3,199 $ 3,433 $ 3,283 $ — $ — $ — Change in Plan Assets: Fair value of assets at beginning of year $ 2,740 $ 2,494 $ 2,249 $ 145 $ 141 $ 132 Actual return on assets 168 350 486 13 14 25 Employer contributions 21 134 41 35 35 35 Participant contributions — — — 19 18 19 Benefits paid (171 ) (165 ) (164 ) (66 ) (63 ) (70 ) Settlements (89 ) (73 ) (118 ) — — — Fair value of assets at end of year $ 2,669 $ 2,740 $ 2,494 $ 146 $ 145 $ 141 Funded Status: Projected benefit obligation at end of year $ (3,358 ) $ (3,596 ) $ (3,400 ) $ (861 ) $ (1,013 ) $ (999 ) Fair value of assets at end of year 2,669 2,740 2,494 146 145 141 Funded status at end of year $ (689 ) $ (856 ) $ (906 ) $ (715 ) $ (868 ) $ (858 ) Pension Plans OPEB Plans At December 31, At December 31, 2021 2020 2021 2020 Amounts Recognized in the Balance Sheet Consist of: Liabilities: Other current liabilities $ (5 ) $ (5 ) $ (12 ) $ (14 ) Other noncurrent liabilities (705 ) (863 ) (703 ) (854 ) Net liability recognized $ (710 ) $ (868 ) $ (715 ) $ (868 ) Assets: Other noncurrent assets $ 21 $ 12 $ — $ — Regulatory assets: Net loss (gain) 355 556 (27 ) 132 Prior service credit — — — (16 ) Net regulatory assets recognized 355 556 (27 ) 116 Net assets recognized $ 376 $ 568 $ (27 ) $ 116 Accumulated other comprehensive net loss $ 93 $ 108 $ 3 $ 3 The following tables provide information regarding the assumed health care cost trend rates. Year Ended December 31, 2021 2020 2019 Assumed Health Care Cost Trend Rates—Not Medicare Eligible: Health care cost trend rate assumed for next year 6.70 % 6.90 % 7.20 % Rate to which the cost trend is expected to decline (the ultimate trend rate) 4.50 % 4.50 % 4.50 % Year that the rate reaches the ultimate trend rate 2029 2029 2029 Assumed Health Care Cost Trend Rates—Medicare Eligible: Health care cost trend rate assumed for next year 7.50 % 7.80 % 8.00 % Rate to which the cost trend is expected to decline (the ultimate trend rate) 4.50 % 4.50 % 4.50 % Year that the rate reaches the ultimate trend rate 2031 2030 2029 The following table provides information regarding pension plans with projected benefit obligations (PBO) and accumulated benefit obligations (ABO) in excess of the fair value of plan assets. At December 31, 2021 2020 Pension Plans with PBO and ABO in Excess of Plan Assets (a): Projected benefit obligations $ 3,358 $ 3,596 Accumulated benefit obligations $ 3,199 $ 3,433 Plan assets $ 2,669 $ 2,740 (a) PBO, ABO and the plan assets relating to Oncor’s obligations with respect to the Vistra Retirement Plan are included. Oncor’s obligations with respect to the Vistra Retirement Plan are overfunded. As of December 31, 2021, PBO, ABO and the plan assets relating to Oncor’s obligations with respect to the Vistra Retirement Plan were $187 million, $185 million and $208 million, respectively. As of December 31, 2020, PBO, ABO and the plan assets relating to Oncor’s obligations with respect to the Vistra Retirement Plan were $196 million, $194 million and $208 million, respectively. The following table provides information regarding OPEB Plans with accumulated projected benefit obligations (APBO) in excess of the fair value of plan assets. At December 31, 2021 2020 OPEB Plans with APBO in Excess of Plan Assets Accumulated postretirement benefit obligations $ 861 $ 1,013 Plan assets $ 146 $ 145 Pension and OPEB Plans Investment Strategy and Asset Allocations Our investment objective for the retirement plans is to invest in a suitable mix of assets to meet the future benefit obligations at an acceptable level of risk, while minimizing the volatility of contributions. Equity securities are held to achieve returns in excess of passive indexes by participating in a wide range of investment opportunities. International equity, real estate securities and credit strategies (high yield bonds, emerging market debt and bank loans) are used to further diversify the equity portfolio. International equity securities may include investments in both developed and emerging international markets. Fixed income securities include primarily corporate bonds from a diversified range of companies, U.S. Treasuries and agency securities and money market instruments. Our investment strategy for fixed income investments is to maintain a high grade portfolio of securities, which assists us in managing the volatility and magnitude of plan contributions and expense while maintaining sufficient cash and short-term investments to pay near-term benefits and expenses. The Oncor Retirement Plan’s investments are managed in two pools: one pool associated with the recoverable service portion of plan obligations related to Oncor’s regulated utility business, and a second pool associated with the non-recoverable The target asset allocation ranges of the pension plan’s investments by asset category are as follows: Target Allocation Ranges Asset Category Recoverable Non-recoverable International equities 12% –20% 5% – 11% U.S. equities 15% – 23% 6% – 12% Real estate 3% – 7% — Credit strategies 5% – 9% 4% – 8% Fixed income 48% – 58% 72% – 82% Our investment objective for the OPEB Plans primarily follows the objectives of the pension plans discussed above, while maintaining sufficient cash and short-term investments to pay near-term benefits and expenses. The actual amounts at December 31, 2021 provided below are consistent with the asset allocation targets. Fair Value Measurement of Pension Plans’ Assets At December 31, 2021 and 2020, pension plans’ assets measured at fair value on a recurring basis consisted of the following: At December 31, 2021 Level 1 Level 2 Level 3 Total Asset Category Interest-bearing cash $ — $ 9 $ — $ 9 Equity securities: U.S. 65 1 — 66 International 138 1 — 139 Fixed income securities: Corporate bonds (a) — 879 — 879 U.S. Treasuries — 55 — 55 Other (b) — 50 — 50 Total assets in the fair value hierarchy $ 203 $ 995 $ — 1,198 Total assets measured at net asset value (c) 1,471 Total fair value of plan assets $2,669 At December 31, 2020 Level 1 Level 2 Level 3 Total Asset Category Equity securities: U.S. $ 220 $ 1 $ — $ 221 International 330 1 — 331 Fixed income securities: Corporate bonds (a) — 910 — 910 U.S. Treasuries — 46 — 46 Other (b) — 57 — 57 Total assets in the fair value hierarchy $ 550 $ 1,015 $ — 1,565 Total assets measured at net asset value (c) 1,175 Total fair value of plan assets $2,740 (a) Substantially all corporate bonds are rated investment grade by Fitch, Moody’s or S&P. (b) Other consists primarily of municipal bonds, emerging market debt, bank loans and fixed income derivative instruments. (c) Fair value was measured using the net asset value (NAV) per share as a practical expedient as the investments did not have a readily determinable fair value and are not required to be classified in the fair value hierarchy. The NAV fair value amounts presented here are intended to permit a reconciliation to the total fair value of plan assets. Fair Value Measurement of OPEB Plans’ Assets At D e At December 31, 2021 Level 1 Level 2 Level 3 Total Asset Category Interest-bearing cash $ 9 $ — $ — $ 9 Equity securities: U.S. 16 — — 16 International 17 — — 17 Fixed income securities: Corporate bonds (a) — 37 — 37 U.S. Treasuries — 2 — 2 Other (b) 16 2 — 18 Total assets in the fair value hierarchy $ 58 $ 41 $ — 99 Total assets measured at net asset value (c) 47 Total fair value of plan assets $ 146 At December 31, 2020 Level 1 Level 2 Level 3 Total Asset Category Interest-bearing cash $ 9 $ — $ — $ 9 Equity securities: U.S. 24 — — 24 International 25 — — 25 Fixed income securities: Corporate bonds (a) — 34 — 34 U.S. Treasuries — 1 — 1 Other (b) 19 3 — 22 Total assets in the fair value hierarchy $ 77 $ 38 $ — 115 Total assets measured at net asset value (c) 30 Total fair value of plan assets $ 145 (a) Substantially all corporate bonds are rated investment grade by Fitch, Moody’s or S&P. (b) Other consists primarily of diversified bond mutual funds. (c) Fair value was measured using the net asset value (NAV) per share as a practical expedient as the investments did not have a readily determinable fair value and are not required to be classified in the fair value hierarchy. The NAV fair value amounts presented here are intended to permit a reconciliation to the total fair value of plan assets. Expected Long-Term Rate of Return on Assets Assumption The retirement plans’ strategic asset allocation is determined in conjunction with the plans’ advisors and utilizes a comprehensive Asset-Liability modeling approach to evaluate potential long-term outcomes of various investment strategies. The modeling incorporates long-term rate of return assumptions for each asset class based on historical and future expected asset class returns, current market conditions, rate of inflation, current prospects for economic growth, and taking into account the diversification benefits of investing in multiple asset classes and potential benefits of employing active investment management. Pension Plans OPEB Plans Asset Class Expected Long-Term Asset Class Expected Long-Term International equity securities 7.05 % 401(h) accounts 5.78 % U.S. equity securities 6.10 % Life insurance VEBA 5.70 % Real estate 5.40 % Union VEBA 5.70 % Credit strategies 5.50 % Non-union 1.90 % Fixed income securities 3.07 % Shared retiree VEBA 1.90 % Weighted average (a) 4.87 % Weighted average 5.61 % (a) The 2022 expected long-term rate of return for the nonregulated portion of the Oncor Retirement Plan is 4.17%, and for Oncor’s obligations with respect to the Vistra Retirement Plan is 4.66%. Significant Concentrations of Risk The plans’ investments are exposed to risks such as interest rate, capital market and credit risks. We seek to optimize return on investment consistent with levels of liquidity and investment risk which are prudent and reasonable, given prevailing capital market conditions and other factors specific to participating employers. While we recognize the importance of return, investments will be diversified in order to minimize the risk of large losses unless, under the circumstances, it is clearly prudent not to do so. There are also various restrictions and guidelines in place including limitations on types of investments allowed and portfolio weightings for certain investment securities to assist in the mitigation of the risk of large losses. Assumed Discount Rate For the Oncor retirement plans at December 31, 2021, we selected the assumed discount rate using the Aon AA-AAA Pension and OPEB Plans Cash Contributions Our contributions to the benefit plans were as follows: Year Ended December 31, 2021 2020 2019 Pension plans contributions $ 21 $ 134 $ 41 OPEB Plans contributions 35 35 35 Total contributions $ 56 $ 169 $ 76 Our funding for the pension plans and the OPEB Plans is expected to total $5 million and $35 million, respectively, in 2022 and approximately $90 million and $177 million, respectively, in the five-year period 2022 to 2026. Future Benefit Payments Estimated future benefit payments to participants are as follows: 2022 2023 2024 2025 2026 2027-31 Pension plans $ 181 $ 184 $ 188 $ 191 $ 192 $ 950 OPEB Plans $ 45 $ 47 $ 48 $ 48 $ 49 $ 241 Thrift Plan Our employees are eligible to participate in a qualified savings plan, the Oncor Thrift Plan, which is a participant-directed defined contribution plan subject to the provisions of ERISA and intended to qualify under Section 401(a) of the Code, and to meet the requirements of Code Sections 401(k) and 401(m). Under the plan, employees may contribute, through pre-tax after-tax

Related-Party Transactions

Related-Party Transactions	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
RELATED-PARTY TRANSACTIONS	10. RELATED-PARTY TRANSACTIONS The following represent our significant related-party transactions and related matters. • 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 which 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 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 agreement and reported on our balance sheet consisted of the following: At December 31, 2021 At December 31, 2020 STH Texas Total STH Texas Transmission Total Federal income taxes payable (receivable) $ (5 ) $ (1 ) $ (6 ) $ (6 ) $ (1 ) $ (7 ) Texas margin tax payable 24 — 24 23 — 23 Net payable (receivable) $ 19 $ (1 ) $ 18 $ 17 $ (1 ) $ 16 Cash payments made to our members related to income taxes consisted of the following: Year Ended December 31, 2021 2020 2019 STH Texas Total STH Texas Total STH Texas Total Federal income taxes $ 49 $ 12 $ 61 $ 70 $ 17 $ 87 $ 45 $ 11 $ 56 Texas margin taxes 23 — 23 22 — 22 22 — 22 Total payments $ 72 $ 12 $ 84 $ 92 $ 17 $ 109 $ 67 $ 11 $ 78 • Sempra acquired an indirect 50% interest in Sharyland Holdings, L.P., the parent of Sharyland. As a result of this acquisition, Sharyland is now our affiliate for purposes of PUCT rules. Pursuant to the PUCT order in Docket No. 48929 approving the InfraREIT Acquisition, upon closing of the InfraREIT Acquisition we entered into an operation agreement pursuant to which we will provide certain operations services to Sharyland at cost with no markup or profit. Sharyland provided wholesale transmission service to us in the amount of $10 million, $13 million and $9 million in the years ended December 31, 2021 and 2020, and in the period between the May 16, 2019 InfraREIT Acquisition date through December 31, 2019, respectively. We provided substation monitoring and switching service to Sharyland in the amount of $592,000, $629,000 and $303,000 in the years ended December 31, 2021 and 2020, and in the period between the May 16, 2019 InfraREIT Acquisition date through December 31, 2019, respectively. • We paid Sempra $116,000, $119,000 and $109,000 for the years ended December 31, 2021, 2020 and 2019, respectively, for tax work. See Notes 1, 4, and 8 for information regarding the tax sharing agreement and distributions to members.

Supplementary Financial Informa

Supplementary Financial Information	12 Months Ended
	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
SUPPLEMENTARY FINANCIAL INFORMATION	11. SUPPLEMENTARY FINANCIAL INFORMATION Other Deductions and (Income) Year Ended December 31, 2021 2020 2019 Professional fees $ 9 $ 6 $ 10 InfraREIT Acquisition related costs — — 9 Recoverable Pension and OPEB—non-service 54 55 57 Non-recoverable 3 4 4 AFUDC equity income (27 ) (29 ) (10 ) Interest and investment income (8 ) (4 ) (5 ) Other — 1 (2 ) Total other deductions and (income)—net $ 31 $ 33 $ 63 Interest Expense and Related Charges Year Ended December 31, 2021 2020 2019 Interest $ 415 $ 413 $ 382 Amortization of debt issuance costs and discounts 11 11 9 Less AFUDC—capitalized interest portion (13 ) (19 ) (16 ) Total interest expense and related charges $ 413 $ 405 $ 375 Trade Accounts and Other Receivables Trade accounts and other receivables reported on our balance sheet consisted of the following: At December 31, 2021 2020 Gross trade accounts and other receivables $ 750 $ 767 Allowance for uncollectible accounts (12 ) (7 ) Trade accounts receivable—net $ 738 $ 760 At December 31, 2021, REP subsidiaries of two of our largest customers represented 22% and 21% of the trade accounts receivable balance and no other customers represented 10% or more of the trade accounts receivable balance. At December 31, 2020, REP subsidiaries of two of our 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 sheet consist of the following: At December 31, 2021 2020 Assets related to employee benefit plans $ 133 $ 124 Land 20 16 Other 2 2 Total investments and other property $ 155 $ 142 The majority of these assets represent cash surrender values of life insurance policies that are purchased to fund liabilities under deferred compensation plans. At December 31, 2021 and 2020, the face amount of these policies totaled $198 million and $181 million, respectively, and the net cash surrender values (determined using a Level 2 valuation technique) totaled $99 million and $97 million at December 31, 2021 and 2020, respectively. Changes in cash surrender value are netted against premiums paid. Other investment assets held to satisfy deferred compensation liabilities are recorded at market value. Property, Plant and Equipment Property, plant and equipment reported on our balance sheet consisted of the following: Composite Depreciation At December 31, 2021 2020 Assets in service: Distribution 2.5% /39.5 years $ 15,994 $ 14,937 Transmission 2.9% /34.6 years 13,075 12,156 Other assets 5.5% /18.2 years 1,960 1,855 Total 31,029 28,948 Less accumulated depreciation 8,659 8,336 Net of accumulated depreciation 22,370 20,612 Construction work in progress 557 593 Held for future use 27 20 Property, plant and equipment—net $ 22,954 $ 21,225 Depreciation expense as a percent of average depreciable property approximated 2.7%, 2.7% and 2.7% for the years ended December 31, 2021, 2020 and 2019, respectively. Intangible Assets Intangible assets (other than goodwill) reported on our balance sheet as part of property, plant and equipment consisted of the following: At December 31, 2021 At December 31, 2020 Gross Accumulated Net Gross Accumulated Net Identifiable intangible assets subject to amortization: Land easements $ 641 $ 117 $ 524 $ 623 $ 112 $ 511 Capitalized software 1,066 451 615 1,027 484 543 Total $ 1,707 $ 568 $ 1,139 $ 1,650 $ 596 $ 1,054 Aggregate amortization expense for intangible assets totaled $50 million, $62 million and $52 million for the years ended December 31, 2021, 2020 and 2019, respectively. At December 31, 2021, the weighted average remaining useful lives of capitalized land easements and software were 83 years and 10 years, respectively. The estimated aggregate amortization expense for each of the next five fiscal years is as follows: Year Amortization 2022 $ 67 2023 $ 67 2024 $ 66 2025 $ 66 2026 $ 66 Goodwill totaling $4.740 billion was reported on our balance sheet at both December 31, 2021 and 2020. See Note 1 regarding goodwill impairment assessment and testing. Operating Lease, Third-Party Joint Project and Other Obligations Operating lease, third-party joint project and other obligations reported on our balance sheet consisted of the following: At December 31, 2021 2020 Operating lease liabilities (Notes 1 and 7) $ 133 $ 124 Investment tax credits 4 5 Third-party joint project obligation (Note 3) (a) — 100 Customer deposits—noncurrent 30 — Other 64 76 Total operating lease, third-party joint project and other obligations $ 231 $ 305 (a) Related to a joint project with LP&L. See Note 3 for more information. Supplemental Cash Flow Information Year Ended December 31, 2021 2020 2019 Cash payments (receipts) related to: Interest $ 409 $ 406 $ 368 Less capitalized interest (13 ) (19 ) (16 ) Interest payments (net of amounts capitalized) $ 396 $ 387 $ 352 Amount in lieu of income taxes (a): Federal $ 61 $ 87 $ 56 State 23 22 22 Total payments (receipts) in lieu of income taxes $ 84 $ 109 $ 78 Acquisition: Assets acquired $ — $ — $ 2,547 Liabilities assumed — — (1,223 ) Cash paid $ — $ — $ 1,324 Noncash investing and financing activities: Construction expenditures financed through accounts payable (investing) (b) $ 254 $ 254 $ 278 Transfer of title to assets constructed for and prepaid by LP&L (investing) (Note 3) $ 150 $ — $ — ROU assets obtained in exchange for operating lease obligations (investing) $ 52 $ 72 $ 38 Debt exchange offering (financing) $ — $ 300 $ — (a) See Note 10 for income tax related detail. (b) Represents end-of-period

Acquisition Activity

Acquisition Activity	12 Months Ended
	Dec. 31, 2021
Business Combinations [Abstract]
Acquisition Activity	12. ACQUISITION ACTIVITY InfraREIT Acquisition In May 2019, we completed the InfraREIT Acquisition, pursuant to which we acquired all of the equity interests of InfraREIT and its subsidiary, InfraREIT Partners, LP for a total cash consideration of $1.275 billion. In addition, we paid certain transaction costs incurred by InfraREIT with the aggregate cash consideration and payment of InfraREIT expenses totaling $1.324 billion. In connection with and immediately following the closing of the InfraREIT Acquisition, in May 2019, Oncor extinguished all $953 million outstanding principal amount of debt of InfraREIT and its subsidiaries through repaying $602 million principal amount of InfraREIT subsidiary debt and exchanging new Oncor senior secured debt for $351 million principal amount of InfraREIT subsidiary debt. As a result of the InfraREIT Acquisition, we expanded our existing footprint in Texas by adding various electricity transmission and distribution assets and projects in the north, central, west and panhandle regions of Texas. Business Combination Accounting We accounted for the InfraREIT Acquisition as a business acquisition with identifiable assets acquired and liabilities assumed recorded at their estimated fair values on the closing date. The combined results of operations are reported in our consolidated financial statements beginning as of the closing date. A summary of techniques used to estimate the preliminary fair value of the identifiable assets and liabilities is listed below. • Assets and liabilities that are included in the PUCT cost-based regulatory rate-setting processes are recorded at fair values equal to their regulatory carrying value consistent with GAAP and industry practice. • Working capital was valued using market information (Level 2). The following tables set forth the purchase price paid. The final purchase price allocation was completed as of March 31, 2020. Purchase of outstanding InfraREIT shares and units $ 1,275 Certain transaction costs of InfraREIT paid by Oncor through June 30, 2019 (a) 53 Total purchase price paid through June 30, 2019 1,328 Adjustments made in the period from June 30, 2019 through March 31, 2020 (4 ) Total purchase price paid $ 1,324 (a) Represents certain transaction costs incurred by InfraREIT in connection with the transaction and paid by Oncor, including a $40 million management termination fee payable to an affiliate of Hunt Consolidated, Inc. As of Assets acquired: Current assets $ 45 Property, plant and equipment—net 1,800 Goodwill 676 Regulatory assets 16 Other noncurrent assets 10 Total assets acquired 2,547 Liabilities assumed: Short-term debt 115 Other current liabilities 24 Regulatory liabilities 148 Liability in lieu of deferred income taxes 97 Long-term debt, including due currently 839 Total liabilities assumed 1,223 Net assets acquired 1,324 Total purchase price paid $ 1,324 The goodwill of $676 million arising from the InfraREIT Acquisition is attributable to the assets acquired, which expand our transmission footprint and help us support ERCOT market growth. None of the goodwill is recoverable nor provides a tax benefit in the rate-making process. We did not assume any employee benefit obligations in the acquisition. Acquisition costs incurred in the InfraREIT Acquisition by Oncor and recorded to other deductions totaled $9 million in 2019. For the period from the acquisition closing date through December 31, 2019, our statement of consolidated income include revenues and net income of the acquired business totaling $156 million and $58 million in 2019, respectively. Unaudited Pro Forma Financial Information The unaudited Oncor consolidated pro forma revenues was $4.431 billion for the year ended December 31, 2019 assuming that the InfraREIT Acquisition occurred on January 1, 2019. The unaudited pro forma financial information is provided for information purposes only and is not necessarily indicative of the results of operations that would have occurred had the InfraREIT Acquisition been completed on January 1, 2018, nor is the unaudited pro forma financial information indicative of future results of operations, which may differ materially from the pro forma financial information presented here. The unaudited pro forma financial information above excludes pro forma earnings due to the impracticability of a calculation. The acquiree previously operated under a real estate investment trust structure with a unique cost structure and unique federal tax attributes. An accurate retrospective application cannot be objectively and reliably calculated as the new cost structure and new tax attributes would require a significant amount of estimates and judgments.

Description Of Business And S_2

Description Of Business And Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2021
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. 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 membership interests and Texas Transmission owns 19.75% of our membership interests. We are managed as an integrated business; consequently, there are no separate reportable business segments. Our consolidated financial statements include the results of our wholly owned indirect subsidiary, NTU, which we acquired as part of the InfraREIT Acquisition that closed on May 16, 2019. NTU is a regulated utility that primarily provides electricity transmission delivery service in the north-central, western and panhandle regions of Texas.
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 the 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 various approvals, including PUCT approval through the Sempra Order, which outlines certain ring-fencing measures, governance mechanisms and restrictions that apply after the Sempra 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 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 (each, an Oncor Officer Director), currently Robert S. Shapard and E. Allen Nye, Jr., who are our Chairman of our board of directors 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 In addition, the Sempra Order provides that Oncor’s board of directors cannot be overruled by the board of directors 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 members of the board of directors, provided that certain actions may also require the additional approval of the Oncor Holdings board of directors. The Sempra Order also provides that any changes to the size, composition, structure or rights of the board of directors must first be approved by the PUCT. In addition, if Sempra acquires Texas Transmission’s interest in Oncor, the two board of director 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 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 debt-to-equity debt-to-equity • 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 the closing of the Sempra Acquisition; • Neither Oncor nor Oncor Holdings will lend money to, borrow money from or 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 • Sempra will continue to hold indirectly at least 51% of the ownership interests in Oncor and Oncor Holdings for at least five years following the closing of the Sempra Acquisition, unless otherwise specifically authorized by the PUCT.
Basis Of Presentation	Basis of Presentation 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 year.
Revenue Recognition	Revenue Recognition Oncor’s revenue is billed 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 including a reasonable rate of return on invested capital. Revenues are generally recognized when the underlying service has been provided in an amount prescribed by the related tariff. See Note 3 for additional information regarding revenues.
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 financing activity. 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. For our annual goodwill impairment testing, we have the option to first make a qualitative assessment of whether it is more likely than not that our enterprise fair value is less than our enterprise carrying amount before applying the quantitative goodwill impairment test. If we elect to perform the qualitative assessment, we evaluate relevant events and circumstances, including but not limited to, macroeconomic conditions, industry and market considerations, cost factors and our overall financial performance. If, after assessing these qualitative factors, we determine that it is more-likely-than-not In each of 2021 and 2020, we concluded, based on a qualitative assessment, that our estimated enterprise fair value was more likely than not greater than our carrying value. As a result, no quantitative goodwill impairment tests were required and no impairment was recognized. Goodwill totaling $4.740 billion was reported on our balance sheet at both December 31, 2021 and 2020.
Provision In Lieu Of Income Taxes	Provision in Lieu of Income Taxes Our tax sharing agreement with Oncor Holdings, Texas Transmission and STH provides for the calculation of amounts related to income taxes for each of Oncor Holdings and Oncor substantially as if these entities were taxed as corporations and requires payments to the members determined on that basis (without duplication for any income taxes paid by a subsidiary of Oncor Holdings). We are a partnership for U.S. federal income tax purposes. Accordingly, while partnerships are not subject to income taxes, in consideration of the presentation of our financial statements as an entity subject to cost-based regulatory rate-setting processes, with such costs historically including income taxes, the financial statements present amounts determined under the tax sharing agreement as “provision in lieu of income taxes” and “liability in lieu of deferred income taxes”. Such amounts are determined in accordance with the provisions of the accounting guidance for income taxes and accounting standards that provide interpretive guidance for accounting for uncertain tax positions and thus differences between the book and tax bases of assets and liabilities are accounted for as if we were a stand-alone corporation. In the event such amounts are not paid under the tax sharing agreement, it is probable that this regulatory liability will continue to be included in Oncor’s rate setting processes. We classify any interest and penalties expense related to uncertain tax positions as current provision in lieu of income taxes as discussed in Note 4.
Defined Benefit Pension Plans And OPEB Plans	Defined Benefit Pension Plans and OPEB Plans We have liabilities under pension plans that offer benefits based on either a traditional defined benefit formula or a cash balance formula and OPEB Plans that offer certain health care and life insurance benefits to eligible employees and their eligible dependents upon the retirement of such employees. Costs of pension and OPEB Plans are dependent upon numerous factors, assumptions and estimates. See Note 9 for additional information regarding pension and OPEB Plans.
System Of Accounts	System of Accounts Our accounting records have been maintained in accordance with the FERC Uniform System of Accounts as adopted by the PUCT.
Property, Plant And Equipment	Property, Plant and Equipment Properties are stated at original cost. The cost of self-constructed property additions includes materials and both direct and indirect labor and applicable overhead and an allowance for funds used during construction. Depreciation of property, plant and equipment is calculated on a straight-line basis over the estimated service lives of the properties based on depreciation rates approved by the PUCT. As is common in the industry, depreciation expense is recorded using composite depreciation rates that reflect blended estimates of the lives of major asset groups as compared to depreciation expense calculated on a component asset-by-asset
Regulatory Assets And Liabilities	Regulatory Assets and Liabilities We are subject to rate regulation and our financial statements reflect regulatory assets and liabilities in accordance with accounting standards related to the effect of certain types of regulation. Regulatory assets and liabilities represent probable future revenues that will be recovered from or refunded to customers through the ratemaking process based on PURA and/or the PUCT’s orders, precedents or substantive rules. Rate regulation is premised on the full recovery of prudently incurred costs and a reasonable rate of return on invested capital subject to PUCT review for reasonableness. Regulatory decisions can have an impact on the recovery of costs, the rate earned on invested capital and the timing and amount of assets to be recovered by rates. See Note 2 for more information regarding regulatory assets and liabilities.
Franchise Taxes	Franchise Taxes Franchise taxes are assessed to us by local governmental bodies, based on kWh delivered and are a principal component of taxes other than amounts related to income taxes as reported in the income statement. Franchise taxes 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.
Allowance For Funds Used During Construction	Allowance for Funds Used During Construction AFUDC is a regulatory cost accounting procedure whereby both interest charges on borrowed funds and a return on equity capital used to finance construction are included in the recorded cost of utility plant and equipment being constructed. AFUDC is capitalized on all projects involving construction periods lasting greater than thirty days. The interest portion of capitalized AFUDC is accounted for as a reduction to interest expense and the equity portion of capitalized AFUDC is accounted for as other income. See Note 11 for detail of amounts reducing interest expense and increasing other income.
Cash, Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted Cash For purposes of reporting cash and cash equivalents, highly liquid investments with original maturities of three months or less at the date of purchase are considered to be cash equivalents. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported on the Consolidated Balance Sheets to the sum of such amounts reported on the Statements of Consolidated Cash Flows: At December 31, 2021 2020 Cash, cash equivalents and restricted cash Cash and cash equivalents $ 11 $ 27 Restricted cash, current (a) 13 — Restricted cash, noncurrent (a) 30 — Total cash, cash equivalents and restricted cash on the Statements of Consolidated Cash Flows $ 54 $ 27 (a) Restricted cash represents amounts deposited with Oncor, by our customers, but subject to return in accordance with the PUCT rules, ERCOT requirement or our tariffs, relating to generation interconnection and construction and/or extension of electric delivery system facilities. We maintain these amounts in a separate escrow account.
Fair Value Of Nonderivative Financial Instruments	Fair Value of Nonderivative Financial Instruments The carrying amounts for financial assets classified as current assets and the carrying amounts for financial liabilities classified as current liabilities approximate fair value due to the short maturity of such instruments. The fair values of other financial instruments, for which carrying amounts and fair values have not been presented, are not materially different than their related carrying amounts. The following discussion of fair value accounting standards applies primarily to our determination of the fair value of assets in the pension and OPEB Plans’ trusts (see Note 9) and long-term debt (see Note 6). Accounting standards related to the determination of fair value define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. We use a “mid-market” mid-point We categorize our assets and liabilities recorded at fair value based upon the following fair value hierarchy: • Level 1 valuations use quoted prices in active markets for identical assets or liabilities that are accessible at the measurement date. An active market is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis. • Level 2 valuations use inputs that, in the absence of actively quoted market prices, are observable for the asset or liability, either directly or indirectly. Level 2 inputs include: (a) quoted prices for similar assets or liabilities in active markets, (b) quoted prices for identical or similar assets or liabilities in markets that are not active, (c) inputs other than quoted prices that are observable for the asset or liability such as interest rates and yield curves observable at commonly quoted intervals and (d) inputs that are derived principally from or corroborated by observable market data by correlation or other means. Our Level 2 valuations utilize over-the-counter • Level 3 valuations use unobservable inputs for the asset or liability. Unobservable inputs are used to the extent observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date. We use the most meaningful information available from the market combined with internally developed valuation methodologies to develop our best estimate of fair value. We utilize several different valuation techniques to measure the fair value of assets and liabilities, relying primarily on the market approach of using prices and other market information for identical and/or comparable assets and liabilities for those items that are measured on a recurring basis. The fair value of certain investments is measured using the net asset value (NAV) per share as a practical expedient. Such investments measured at NAV are not required to be categorized within the fair value hierarchy.
Derivative Instruments And Mark-To-Market Accounting	Derivative Instruments and Mark-to-Market From time-to-time “mark-to-market”
Contingencies	Contingencies Our financial results may be affected by judgments and estimates related to contingencies. For loss contingencies, we accrue the loss if an event has occurred on or before the balance sheet date, and: • information available through the date we file our financial statements indicates it is probable that a loss has been incurred, given the likelihood of uncertain future events; and • the amount of the loss can be reasonably estimated. We do not accrue contingencies that might result in gains. We continuously assess contingencies for litigation claims, environmental remediation and other events. See Note 7 for a discussion of contingencies.
Effects Of Reference Rate Reform On Financial Reporting	Effects of Reference Rate Reform on Financial Reporting Our Credit Facility uses LIBOR as a benchmark for establishing interest rates but incorporates a transition mechanism for the phase-out phase-out No. 2020-04.

Description Of Business And S_3

Description Of Business And Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Schedule Of Cash, Cash Equivalents And Restricted Cash	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported on the Consolidated Balance Sheets to the sum of such amounts reported on the Statements of Consolidated Cash Flows: At December 31, 2021 2020 Cash, cash equivalents and restricted cash Cash and cash equivalents $ 11 $ 27 Restricted cash, current (a) 13 — Restricted cash, noncurrent (a) 30 — Total cash, cash equivalents and restricted cash on the Statements of Consolidated Cash Flows $ 54 $ 27 (a) Restricted cash represents amounts deposited with Oncor, by our customers, but subject to return in accordance with the PUCT rules, ERCOT requirement or our tariffs, relating to generation interconnection and construction and/or extension of electric delivery system facilities. We maintain these amounts in a separate escrow account.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2021
Regulated Operations [Abstract]
Components Of 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 December 31, 2021 are provided in the table below. Amounts not earning a return through rate regulation are noted. Remaining Rate December 31, 2021 At December 31, 2021 2020 Regulatory assets: Employee retirement liability (a)(b)(c) To be determined $ 328 $ 672 Employee retirement costs being amortized 6 years 193 227 Employee retirement costs incurred since the last rate review period (b) To be determined 99 67 Self-insurance reserve (primarily storm recovery costs) being amortized 6 years 223 266 Self-insurance reserve incurred since the last rate review period (primarily storm related) (b) To be determined 373 256 Debt reacquisition costs Lives of related debt 19 25 Under-recovered AMS costs 6 years 128 149 Energy efficiency performance bonus (a) 1 year or less 31 14 Wholesale distribution substation service To be determined 75 55 Unrecovered expenses related to COVID-19 To be determined 35 27 Recoverable deferred income taxes—net Various 16 9 Uncollectible payments from REPs (b) To be determined 9 — Other regulatory assets Various 18 12 Total regulatory assets 1,547 1,779 Regulatory liabilities: Estimated net removal costs Lives of related assets 1,348 1,262 Excess deferred taxes Primarily over lives of related assets 1,442 1,508 Over-recovered wholesale transmission service expense (a) 1 year or less 7 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 39 — Other regulatory liabilities Various 14 6 Total regulatory liabilities 2,876 2,855 Net regulatory assets (liabilities) $ (1,329 ) $ (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)	12 Months Ended
	Dec. 31, 2021
Revenues [Abstract]
Disaggregation Of Revenues	The following table reflects electric delivery revenues disaggregated by tariff: Year Ended December 31, 2021 2020 2019 Operating revenues Revenues contributing to earnings: Distribution base revenues $ 2,217 $ 2,156 $ 2,143 Transmission base revenues (TCOS revenues) Billed to third-party wholesale customers 879 803 681 Billed to REPs serving Oncor distribution customers, through TCRF 479 446 391 Total transmission base revenues 1,358 1,249 1,072 Other miscellaneous revenues 104 87 77 Total revenues contributing to earnings 3,679 3,492 3,292 Revenues collected for pass-through expenses: TCRF—third-party wholesale transmission service 1,039 975 1,005 EECRF 46 44 50 Revenues collected for pass-through expenses 1,085 1,019 1,055 Total operating revenues $ 4,764 $ 4,511 $ 4,347

Provision In Lieu Of Income T_2

Provision In Lieu Of Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Provision In Lieu Of Income Taxes [Abstract]
Schedule Of Deferred Tax Assets and Liabilities	The components of our liability in lieu of deferred income taxes are provided in the table below. At December 31, 2021 2020 Deferred Tax Related Assets: Employee benefit liabilities $ 253 $ 233 Regulatory liabilities 45 48 Other 45 47 Total 343 328 Deferred Tax Related Liabilities: Property, plant and equipment 2,132 1,994 Regulatory assets 274 255 Other 2 2 Total 2,408 2,251 Liability in lieu of d e $2,065 $1,923
Components Of Income Tax Provisions (Benefits)	The components of our reported provision (benefit) in lieu of income taxes are as follows: Year Ended December 31, 2021 2020 2019 Reported in operating expenses: Current: U.S. federal $ 79 $ 100 $ 69 State 24 22 22 Deferred: U.S. federal 63 27 49 Amortization of investment tax credits (1 ) (1 ) (2 ) Total reported in operating expenses 165 148 138 Reported in other income and deductions: Current: U.S. federal (17 ) (17 ) (21 ) Deferred federal 5 5 6 Total reported in other income and deductions (12 ) (12 ) (15 ) Total provision in lieu of income taxes $ 153 $ 136 $ 123
Schedule Of Income Tax Reconciliation	Reconciliation of provision in lieu of income taxes computed at the U.S. federal statutory rate to provision in lieu of income taxes: Year Ended December 31, 2021 2020 2019 Income before provision in lieu of income taxes $ 923 $ 849 $ 774 Provision in lieu of income taxes at the U.S. federal statutory rate of 21% $ 194 $ 178 $ 163 Amortization of investment tax credits—net of deferred tax effect (1 ) (1 ) (2 ) Amortization of excess deferred taxes (52 ) (52 ) (52 ) Texas margin tax, net of federal tax benefit 19 18 17 Nontaxable gains on benefit plan investments (3 ) (2 ) (2 ) Other (4 ) (5 ) (1 ) Reported provision in lieu of income taxes $ 153 $ 136 $ 123 Effective rate 16.6 % 16.0 % 15.9 %

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2021
Short-Term Borrowings [Abstract]
Schedule Of Short-Term Borrowings	At December 31, 2021 2020 Total credit facility borrowing capacity $ 2,000 $ 2,000 Credit facility outstanding borrowings — — Commercial paper outstanding (a) (215 ) (70 ) Letters of credit outstanding (b) (8 ) (9 ) Available unused credit $1,777 $1,921 (a) The weighted average interest rates for commercial paper were 0.30% and 0.17% at December 31, 2021 and December 31, 2020, respectively. (b) Interest rates on outstanding letters of credit at December 31, 2021 and December 31, 2020 were 1.20% and 1.45%, respectively, based on our credit ratings.

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2021
Long-Term Debt [Abstract]
Schedule Of Long-Term Debt	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 700 400 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 2.70% Senior Notes due November 15, 2051 500 — 5.35% Senior Notes due October 1, 2052 300 300 Total long-term debt 10,127 9,327 Unamortized discount and debt issuance costs (95 ) (98 ) Less amount due currently (882 ) — Long-term debt, less amounts due currently $ 9,150 $ 9,229
Schedule Of Long-Term Debt Maturity	Year Amount 2022 $ 882 2023 — 2024 500 2025 974 2026 38 Thereafter 7,733 Unamortized discount and debt issuance costs (95 ) Total $ 10,032

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2021
Commitments And Contingencies [Abstract]
Schedule Of Lease Information	At December 31, 2021 2020 Operating Leases: ROU assets: Operating lease ROU, third-party joint project and other assets $ 146 $ 132 Lease liabilities: Operating lease and other current liabilities $ 37 $ 29 Operating lease, third-party joint project and other obligations 133 124 Total operating lease liabilities $170 $153 Weighted-average remaining lease term (in years) 7 7 Weighted-average discount rate 2.5 % 2.8 %
Schedule Of Lease Costs	Year Ended December 31, 2021 2020 2019 Operating lease cost: Operating lease costs (including amounts allocated to property, plant and equipment) $ 51 $ 42 $ 40 Short-term lease costs 11 10 34 Total operating lease costs $ 62 $ 52 $ 74 Operating lease payments: Cash paid for amounts included in the measurement of lease liabilities $ 40 $ 35 $ 32
Schedule Of Operating Lease Maturity	Year Amount 2022 $ 40 2023 32 2024 25 2025 17 2026 10 Thereafter 56 Total undiscounted lease payments 180 Less imputed interest (10 ) Total operating lease obligations $ 170

Membership Interests (Tables)

Membership Interests (Tables)	12 Months Ended
	Dec. 31, 2021
Membership Interests [Abstract]
Schedule Of Cash Capital Contributions	Receipt Date Amount February 16, 2021 $ 63 April 27, 2021 $ 63 July 27, 2021 $ 62 October 26, 2021 $ 67 December 22, 2021 $ 450
Schedule Of Distributions Paid	Declaration Date Payment Date Amount February 17, 2021 February 18, 2021 $ 96 April 28, 2021 April 29, 2021 $ 96 July 28, 2021 July 29, 2021 $ 546 October 27, 2021 October 28, 2021 $ 101
Schedule Of Changes To Accumulated Other Comprehensive Income (Loss)	Cash Flow Defined Benefit Accumulated Other Balance at December 31, 2018 $ (16 ) $ (148 ) $ (164 ) Defined benefit pension plans — 27 27 Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax expense $-) 2 — 2 Amounts reclassified from accumulated other comprehensive income (loss) to capital account (4 ) — (4 ) Balance at December 31, 2019 $ (18 ) $ (121 ) $ (139 ) Defined benefit pension plans — 9 9 Cash flow hedges—net decrease in fair value of derivatives (net of tax benefit of $6) (24 ) — (24 ) Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax expense $1) 3 — 3 Balance at December 31, 2020 $ (39 ) $ (112 ) $ (151 ) Defined benefit pension plans — 17 17 Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax expense $-) 3 — 3 Balance at December 31, 2021 $ (36 ) $ (95 ) $ (131 )

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Schedule Of Pension And OPEB Plan Costs	Year Ended December 31, 2021 2020 2019 Pension costs $ 70 $ 71 $ 63 OPEB costs 25 19 41 Total benefit costs 95 90 104 Less amounts recognized principally as property, regulatory asset or regulatory liability (19 ) (13 ) (27 ) Net amounts recognized as operation and maintenance expense or other deductions $ 76 $ 77 $ 77
Schedule Of Detailed Pension And OPEB Benefit Information	Pension Plans OPEB Plans Year Ended December 31, Year Ended December 31, 2021 2020 2019 2021 2020 2019 Assumptions Used to Determine Net Periodic Pension and OPEB Costs: Discount rate 2.40 % 3.13 % 4.18 % 2.58 % 3.29 % 4.41 % Expected return on plan assets 4.35 % 4.94 % 5.42 % 5.24 % 5.90 % 6.19 % Rate of compensation increase 4.80 % 4.64 % 4.53 % — — — Components of Net Pension and OPEB Costs: Service cost $ 33 $ 29 $ 25 $ 5 $ 6 $ 6 Interest cost 84 103 128 26 32 43 Expected return on assets (99 ) (109 ) (119 ) (7 ) (8 ) (7 ) Amortization of prior service cost (credit) — — — (17 ) (20 ) (20 ) Amortization of net loss 52 48 29 18 10 19 Curtailment cost (credit) — — — — (1 ) — Net periodic pension and OPEB costs $ 70 $ 71 $ 63 $ 25 $ 19 $ 41 Other Changes in Plan Assets and Benefit Obligations Recognized as Regulatory Assets or in Other Comprehensive Income: Curtailment $ — $ — $ — $ — $ 2 $ — Net loss (gain) (164 ) 61 — (142 ) 14 (22 ) Amortization of net loss (52 ) (48 ) (29 ) (18 ) (10 ) (19 ) Amortization of prior service (cost) credit — — — 17 20 20 Total recognized as regulatory assets or other comprehensive income (216 ) 13 (29 ) (143 ) 26 (21 ) Total recognized in net periodic pension and OPEB costs and as regulatory assets or other comprehensive income $ (146 ) $ 84 $ 34 $ (118 ) $ 45 $ 20
Schedule Of Assumptions Used	Pension Plans OPEB Plans Year Ended December 31, Year Ended December 31, 2021 2020 2019 2021 2020 2019 Assumptions Used to Determine Benefit Obligations at Period End: Discount rate 2.75 % 2.40 % 3.13 % 2.91 % 2.58 % 3.29 % Rate of compensation increase 4.98 % 4.80 % 4.64 % — — —
Schedule Of Changes In Projected Benefit Obligations And Changes In Fair Value Of Plan Assets And Net Funded Status	Pension Plans OPEB Plans Year Ended December 31, Year Ended December 31, 2021 2020 2019 2021 2020 2019 Change in Projected Benefit Obligation: Projected benefit obligation at beginning of year $ 3,596 $ 3,400 $ 3,162 $ 1,013 $ 999 $ 1,006 Service cost 33 29 25 5 6 6 Interest cost 84 103 128 26 32 43 Participant contributions — — — 19 18 19 Actuarial loss (gain) (95 ) 302 367 (136 ) 20 (5 ) Benefits paid (171 ) (165 ) (164 ) (66 ) (63 ) (70 ) Curtailment — — — — 1 — Settlements (89 ) (73 ) (118 ) — — — Projected benefit obligation at end of year $ 3,358 $ 3,596 $ 3,400 $ 861 $ 1,013 $ 999 Accumulated benefit obligation at end of year $ 3,199 $ 3,433 $ 3,283 $ — $ — $ — Change in Plan Assets: Fair value of assets at beginning of year $ 2,740 $ 2,494 $ 2,249 $ 145 $ 141 $ 132 Actual return on assets 168 350 486 13 14 25 Employer contributions 21 134 41 35 35 35 Participant contributions — — — 19 18 19 Benefits paid (171 ) (165 ) (164 ) (66 ) (63 ) (70 ) Settlements (89 ) (73 ) (118 ) — — — Fair value of assets at end of year $ 2,669 $ 2,740 $ 2,494 $ 146 $ 145 $ 141 Funded Status: Projected benefit obligation at end of year $ (3,358 ) $ (3,596 ) $ (3,400 ) $ (861 ) $ (1,013 ) $ (999 ) Fair value of assets at end of year 2,669 2,740 2,494 146 145 141 Funded status at end of year $ (689 ) $ (856 ) $ (906 ) $ (715 ) $ (868 ) $ (858 )
Schedule Of Amounts Recognized In Balance Sheet	Pension Plans OPEB Plans At December 31, At December 31, 2021 2020 2021 2020 Amounts Recognized in the Balance Sheet Consist of: Liabilities: Other current liabilities $ (5 ) $ (5 ) $ (12 ) $ (14 ) Other noncurrent liabilities (705 ) (863 ) (703 ) (854 ) Net liability recognized $ (710 ) $ (868 ) $ (715 ) $ (868 ) Assets: Other noncurrent assets $ 21 $ 12 $ — $ — Regulatory assets: Net loss (gain) 355 556 (27 ) 132 Prior service credit — — — (16 ) Net regulatory assets recognized 355 556 (27 ) 116 Net assets recognized $ 376 $ 568 $ (27 ) $ 116 Accumulated other comprehensive net loss $ 93 $ 108 $ 3 $ 3
Schedule Of Health Care Cost Trend Rates	Year Ended December 31, 2021 2020 2019 Assumed Health Care Cost Trend Rates—Not Medicare Eligible: Health care cost trend rate assumed for next year 6.70 % 6.90 % 7.20 % Rate to which the cost trend is expected to decline (the ultimate trend rate) 4.50 % 4.50 % 4.50 % Year that the rate reaches the ultimate trend rate 2029 2029 2029 Assumed Health Care Cost Trend Rates—Medicare Eligible: Health care cost trend rate assumed for next year 7.50 % 7.80 % 8.00 % Rate to which the cost trend is expected to decline (the ultimate trend rate) 4.50 % 4.50 % 4.50 % Year that the rate reaches the ultimate trend rate 2031 2030 2029
Schedule Of Projected Benefit Obligations And Accumulated Benefit Obligations In Excess Of Plan Assets Fair Value	The following table provides information regarding pension plans with projected benefit obligations (PBO) and accumulated benefit obligations (ABO) in excess of the fair value of plan assets. At December 31, 2021 2020 Pension Plans with PBO and ABO in Excess of Plan Assets (a): Projected benefit obligations $ 3,358 $ 3,596 Accumulated benefit obligations $ 3,199 $ 3,433 Plan assets $ 2,669 $ 2,740 (a) PBO, ABO and the plan assets relating to Oncor’s obligations with respect to the Vistra Retirement Plan are included. Oncor’s obligations with respect to the Vistra Retirement Plan are overfunded. As of December 31, 2021, PBO, ABO and the plan assets relating to Oncor’s obligations with respect to the Vistra Retirement Plan were $187 million, $185 million and $208 million, respectively. As of December 31, 2020, PBO, ABO and the plan assets relating to Oncor’s obligations with respect to the Vistra Retirement Plan were $196 million, $194 million and $208 million, respectively. The following table provides information regarding OPEB Plans with accumulated projected benefit obligations (APBO) in excess of the fair value of plan assets. At December 31, 2021 2020 OPEB Plans with APBO in Excess of Plan Assets Accumulated postretirement benefit obligations $ 861 $ 1,013 Plan assets $ 146 $ 145
Schedule Of Target Asset Allocation Ranges By Asset Category	Target Allocation Ranges Asset Category Recoverable Non-recoverable International equities 12% –20% 5% – 11% U.S. equities 15% – 23% 6% – 12% Real estate 3% – 7% — Credit strategies 5% – 9% 4% – 8% Fixed income 48% – 58% 72% – 82%
Schedule Of Expected Long-Term Rate Of Return On Assets Assumptions	Pension Plans OPEB Plans Asset Class Expected Long-Term Asset Class Expected Long-Term International equity securities 7.05 % 401(h) accounts 5.78 % U.S. equity securities 6.10 % Life insurance VEBA 5.70 % Real estate 5.40 % Union VEBA 5.70 % Credit strategies 5.50 % Non-union 1.90 % Fixed income securities 3.07 % Shared retiree VEBA 1.90 % Weighted average (a) 4.87 % Weighted average 5.61 % (a) The 2022 expected long-term rate of return for the nonregulated portion of the Oncor Retirement Plan is 4.17%, and for Oncor’s obligations with respect to the Vistra Retirement Plan is 4.66%.
Schedule Of Contributions	Year Ended December 31, 2021 2020 2019 Pension plans contributions $ 21 $ 134 $ 41 OPEB Plans contributions 35 35 35 Total contributions $ 56 $ 169 $ 76
Schedule Of Estimated Future Benefit Payments	2022 2023 2024 2025 2026 2027-31 Pension plans $ 181 $ 184 $ 188 $ 191 $ 192 $ 950 OPEB Plans $ 45 $ 47 $ 48 $ 48 $ 49 $ 241
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule Of Assets Fair Value Measured On Recurring Basis	At December 31, 2021 Level 1 Level 2 Level 3 Total Asset Category Interest-bearing cash $ — $ 9 $ — $ 9 Equity securities: U.S. 65 1 — 66 International 138 1 — 139 Fixed income securities: Corporate bonds (a) — 879 — 879 U.S. Treasuries — 55 — 55 Other (b) — 50 — 50 Total assets in the fair value hierarchy $ 203 $ 995 $ — 1,198 Total assets measured at net asset value (c) 1,471 Total fair value of plan assets $2,669 At December 31, 2020 Level 1 Level 2 Level 3 Total Asset Category Equity securities: U.S. $ 220 $ 1 $ — $ 221 International 330 1 — 331 Fixed income securities: Corporate bonds (a) — 910 — 910 U.S. Treasuries — 46 — 46 Other (b) — 57 — 57 Total assets in the fair value hierarchy $ 550 $ 1,015 $ — 1,565 Total assets measured at net asset value (c) 1,175 Total fair value of plan assets $2,740 (a) Substantially all corporate bonds are rated investment grade by Fitch, Moody’s or S&P. (b) Other consists primarily of municipal bonds, emerging market debt, bank loans and fixed income derivative instruments. (c) Fair value was measured using the net asset value (NAV) per share as a practical expedient as the investments did not have a readily determinable fair value and are not required to be classified in the fair value hierarchy. The NAV fair value amounts presented here are intended to permit a reconciliation to the total fair value of plan assets.
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule Of Assets Fair Value Measured On Recurring Basis	At December 31, 2021 Level 1 Level 2 Level 3 Total Asset Category Interest-bearing cash $ 9 $ — $ — $ 9 Equity securities: U.S. 16 — — 16 International 17 — — 17 Fixed income securities: Corporate bonds (a) — 37 — 37 U.S. Treasuries — 2 — 2 Other (b) 16 2 — 18 Total assets in the fair value hierarchy $ 58 $ 41 $ — 99 Total assets measured at net asset value (c) 47 Total fair value of plan assets $ 146 At December 31, 2020 Level 1 Level 2 Level 3 Total Asset Category Interest-bearing cash $ 9 $ — $ — $ 9 Equity securities: U.S. 24 — — 24 International 25 — — 25 Fixed income securities: Corporate bonds (a) — 34 — 34 U.S. Treasuries — 1 — 1 Other (b) 19 3 — 22 Total assets in the fair value hierarchy $ 77 $ 38 $ — 115 Total assets measured at net asset value (c) 30 Total fair value of plan assets $ 145 (a) Substantially all corporate bonds are rated investment grade by Fitch, Moody’s or S&P. (b) Other consists primarily of diversified bond mutual funds. (c) Fair value was measured using the net asset value (NAV) per share as a practical expedient as the investments did not have a readily determinable fair value and are not required to be classified in the fair value hierarchy. The NAV fair value amounts presented here are intended to permit a reconciliation to the total fair value of plan assets.

Related-Party Transactions (Tab

Related-Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Schedule Of Amounts Payable To (Receivables From) Related Parties	Amounts payable to (receivable from) members related to income taxes under the agreement and reported on our balance sheet consisted of the following: At December 31, 2021 At December 31, 2020 STH Texas Total STH Texas Transmission Total Federal income taxes payable (receivable) $ (5 ) $ (1 ) $ (6 ) $ (6 ) $ (1 ) $ (7 ) Texas margin tax payable 24 — 24 23 — 23 Net payable (receivable) $ 19 $ (1 ) $ 18 $ 17 $ (1 ) $ 16
Schedule Of Cash Payments Made To Related Parties To Income Taxes	Cash payments made to our members related to income taxes consisted of the following: Year Ended December 31, 2021 2020 2019 STH Texas Total STH Texas Total STH Texas Total Federal income taxes $ 49 $ 12 $ 61 $ 70 $ 17 $ 87 $ 45 $ 11 $ 56 Texas margin taxes 23 — 23 22 — 22 22 — 22 Total payments $ 72 $ 12 $ 84 $ 92 $ 17 $ 109 $ 67 $ 11 $ 78

Supplementary Financial Infor_2

Supplementary Financial Information (Tables)	12 Months Ended
	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule Of Other Deductions And (Income)	Other Deductions and (Income) Year Ended December 31, 2021 2020 2019 Professional fees $ 9 $ 6 $ 10 InfraREIT Acquisition related costs — — 9 Recoverable Pension and OPEB—non-service 54 55 57 Non-recoverable 3 4 4 AFUDC equity income (27 ) (29 ) (10 ) Interest and investment income (8 ) (4 ) (5 ) Other — 1 (2 ) Total other deductions and (income)—net $ 31 $ 33 $ 63
Schedule Of Interest Expense And Related Charges	Interest Expense and Related Charges Year Ended December 31, 2021 2020 2019 Interest $ 415 $ 413 $ 382 Amortization of debt issuance costs and discounts 11 11 9 Less AFUDC—capitalized interest portion (13 ) (19 ) (16 ) Total interest expense and related charges $ 413 $ 405 $ 375
Schedule Of Trade Accounts And Other Receivables	Trade Accounts and Other Receivables Trade accounts and other receivables reported on our balance sheet consisted of the following: At December 31, 2021 2020 Gross trade accounts and other receivables $ 750 $ 767 Allowance for uncollectible accounts (12 ) (7 ) Trade accounts receivable—net $ 738 $ 760
Summary of Investments And Other Property	Investments and Other Property Investments and other property reported on our balance sheet consist of the following: At December 31, 2021 2020 Assets related to employee benefit plans $ 133 $ 124 Land 20 16 Other 2 2 Total investments and other property $ 155 $ 142
Schedule Of Property, Plant And Equipment	Property, Plant and Equipment Property, plant and equipment reported on our balance sheet consisted of the following: Composite Depreciation At December 31, 2021 2020 Assets in service: Distribution 2.5% /39.5 years $ 15,994 $ 14,937 Transmission 2.9% /34.6 years 13,075 12,156 Other assets 5.5% /18.2 years 1,960 1,855 Total 31,029 28,948 Less accumulated depreciation 8,659 8,336 Net of accumulated depreciation 22,370 20,612 Construction work in progress 557 593 Held for future use 27 20 Property, plant and equipment—net $ 22,954 $ 21,225
Schedule Of Intangible Assets	Intangible Assets Intangible assets (other than goodwill) reported on our balance sheet as part of property, plant and equipment consisted of the following: At December 31, 2021 At December 31, 2020 Gross Accumulated Net Gross Accumulated Net Identifiable intangible assets subject to amortization: Land easements $ 641 $ 117 $ 524 $ 623 $ 112 $ 511 Capitalized software 1,066 451 615 1,027 484 543 Total $ 1,707 $ 568 $ 1,139 $ 1,650 $ 596 $ 1,054
Schedule Of Estimated Aggregate Amortization Expenses	Year Amortization 2022 $ 67 2023 $ 67 2024 $ 66 2025 $ 66 2026 $ 66
Schedule Of Operating Lease, Third Party Joint Project And Other Obligations	Operating Lease, Third-Party Joint Project and Other Obligations Operating lease, third-party joint project and other obligations reported on our balance sheet consisted of the following: At December 31, 2021 2020 Operating lease liabilities (Notes 1 and 7) $ 133 $ 124 Investment tax credits 4 5 Third-party joint project obligation (Note 3) (a) — 100 Customer deposits—noncurrent 30 — Other 64 76 Total operating lease, third-party joint project and other obligations $ 231 $ 305 (a) Related to a joint project with LP&L. See Note 3 for more information.
Schedule Of Supplemental Cash Flow Information	Supplemental Cash Flow Information Year Ended December 31, 2021 2020 2019 Cash payments (receipts) related to: Interest $ 409 $ 406 $ 368 Less capitalized interest (13 ) (19 ) (16 ) Interest payments (net of amounts capitalized) $ 396 $ 387 $ 352 Amount in lieu of income taxes (a): Federal $ 61 $ 87 $ 56 State 23 22 22 Total payments (receipts) in lieu of income taxes $ 84 $ 109 $ 78 Acquisition: Assets acquired $ — $ — $ 2,547 Liabilities assumed — — (1,223 ) Cash paid $ — $ — $ 1,324 Noncash investing and financing activities: Construction expenditures financed through accounts payable (investing) (b) $ 254 $ 254 $ 278 Transfer of title to assets constructed for and prepaid by LP&L (investing) (Note 3) $ 150 $ — $ — ROU assets obtained in exchange for operating lease obligations (investing) $ 52 $ 72 $ 38 Debt exchange offering (financing) $ — $ 300 $ — (a) See Note 10 for income tax related detail. (b) Represents end-of-period

Acquisition Activity (Tables)

Acquisition Activity (Tables)	12 Months Ended
	Dec. 31, 2021
Business Combinations [Abstract]
Total Purchase Price Paid	The following tables set forth the purchase price paid. The final purchase price allocation was completed as of March 31, 2020. Purchase of outstanding InfraREIT shares and units $ 1,275 Certain transaction costs of InfraREIT paid by Oncor through June 30, 2019 (a) 53 Total purchase price paid through June 30, 2019 1,328 Adjustments made in the period from June 30, 2019 through March 31, 2020 (4 ) Total purchase price paid $ 1,324 (a) Represents certain transaction costs incurred by InfraREIT in connection with the transaction and paid by Oncor, including a $40 million management termination fee payable to an affiliate of Hunt Consolidated, Inc.
Assets And Liabilities Assumed	As of Assets acquired: Current assets $ 45 Property, plant and equipment—net 1,800 Goodwill 676 Regulatory assets 16 Other noncurrent assets 10 Total assets acquired 2,547 Liabilities assumed: Short-term debt 115 Other current liabilities 24 Regulatory liabilities 148 Liability in lieu of deferred income taxes 97 Long-term debt, including due currently 839 Total liabilities assumed 1,223 Net assets acquired 1,324 Total purchase price paid $ 1,324

Description Of Business And S_4

Description Of Business And Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2021USD ($)entity	Dec. 31, 2020USD ($)
Business And Significant Accounting Polices [Line Items]
Ownership holding period	5 years
Number of disinterested directors	7
Direct or indirect ownership interest time period	10 years
Disinterested directors expenditure budget percentage	10.00%
Goodwill impairment | $	$ 0	$ 0
Goodwill | $	$ 4,740,000,000	$ 4,740,000,000
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] | Oncor
Business And Significant Accounting Polices [Line Items]
Ownership interests acquired	51.00%
Texas Transmission [Member]
Business And Significant Accounting Polices [Line Items]
Percentage of membership interest owned by non-controlling owners	19.75%

Description Of Business And S_5

Description Of Business And Significant Accounting Policies (Schedule Of Cash, Cash Equivalents And Restricted Cash) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 11	$ 27
Restricted cash, current	13
Restricted cash, noncurrent	30
Total cash, cash equivalents and restricted cash on the Statements of Consolidated Cash Flows	$ 54	$ 27	$ 4	$ 3

Regulatory Matters (Narrative)

Regulatory Matters (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]
Regulatory assets	$ 35	$ 21

Regulatory Matters (Components

Regulatory Matters (Components Of Regulatory Assets And Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 1,547	$ 1,779
Total regulatory liabilities	2,876	2,855
Net regulatory assets (liabilities)	$ (1,329)	(1,076)
Estimated Net Removal Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Lives of related assets
Total regulatory liabilities	$ 1,348	1,262
Excess Deferred Taxes [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Primarily over lives of related assets
Total regulatory liabilities	$ 1,442	1,508
Over-Recovered Wholesale Transmission Service Expense [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	1 year or less
Total regulatory liabilities	$ 7	52
Unamortized Gain On Reacquisition Of Debt [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Lives of related debt
Total regulatory liabilities	$ 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
Total regulatory liabilities	$ 39
Other Regulatory Liabilities [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Various
Total regulatory liabilities	$ 14	6
Employee Retirement Liability [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 328	672
Remaining Rate Recovery/Amortization Period	To be determined
Employee Retirement Costs Being Amortized [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 193	227
Remaining Rate Recovery/Amortization Period	6 years
Employee Retirement Costs Incurred Since The Last Rate Review Period [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 99	67
Remaining Rate Recovery/Amortization Period	To be determined
Self-Insurance Reserve (Primarily Storm Recovery Costs) Being Amortized [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 223	266
Remaining Rate Recovery/Amortization Period	6 years
Self-Insurance Reserve Incurred Since The Last Rate Review Period (Primarily Storm Related) [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 373	256
Remaining Rate Recovery/Amortization Period	To be determined
Debt Reacquisition Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 19	25
Remaining Rate Recovery/Amortization Period	Lives of related debt
Under-recovered AMS Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 128	149
Remaining Rate Recovery/Amortization Period	6 years
Energy Efficiency Performance Bonus [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 31	14
Remaining Rate Recovery/Amortization Period	1 year or less
Wholesale Distribution Substation Service [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 75	55
Remaining Rate Recovery/Amortization Period	To be determined
Unrecovered Expenses Related To COVID-19 [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 35	27
Remaining Rate Recovery/Amortization Period	To be determined
Recoverable Deferred Income Taxes - Net [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 16	9
Remaining Rate Recovery/Amortization Period	Various
Uncollectible Payments From REPs [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 9
Remaining Rate Recovery/Amortization Period	To be determined
Other Regulatory Assets [Member]
Regulatory Assets And Liabilities [Line Items]
Total regulatory assets	$ 18	$ 12
Remaining Rate Recovery/Amortization Period	Various

Revenues (Narrative) (Details)

Revenues (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)micustomeritem	Dec. 31, 2020USD ($)item	Dec. 31, 2019item
Disaggregation of Revenue [Line Items]
Approved bonus	$ 31	$ 14
Number of REPS | customer	95
Payment term	35 days
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Number of largest customers | item	2	2	2
REP Subsidiary One [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage	25.00%	25.00%	23.00%
REP Subsidiary Two [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage	23.00%	18.00%	18.00%
Lubbock Power & Light (LP&L) [Member]
Disaggregation of Revenue [Line Items]
Joint project cost	$ 370
Transmission line to be built, joint project | mi	175

Revenues (Disaggregation Of Rev

Revenues (Disaggregation Of Revenues) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	$ 3,679	$ 3,492	$ 3,292
Total revenues collected for pass-through expenses	1,085	1,019	1,055
Total operating revenues	4,764	4,511	4,347
Distribution Base Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	2,217	2,156	2,143
Transmission Base Revenues (TCOS Revenues) [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	1,358	1,249	1,072
Transmission Base Revenues (TCOS Revenues) [Member] | Third-Party Wholesale Customers [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	879	803	681
Transmission Base Revenues (TCOS Revenues) [Member] | REPS Serving Oncor Distribution Customers, Through TCRF [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	479	446	391
Other Miscellaneous Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues contributing to earnings	104	87	77
TCRF - Third-party Wholesale Transmission Service [Member]
Disaggregation of Revenue [Line Items]
Total revenues collected for pass-through expenses	1,039	975	1,005
EECRF [Member]
Disaggregation of Revenue [Line Items]
Total revenues collected for pass-through expenses	$ 46	$ 44	$ 50

Provision In Lieu Of Income T_3

Provision In Lieu Of Income Taxes (Narrative) (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Provision In Lieu Of Income Taxes [Abstract]
Net liability in lieu of deferred income taxes	$ 2,065,000,000	$ 1,923,000,000
Uncertain tax positions related to timing of recognition		0
Accrued interest		0
Benefit (expense) from interest and penalties		$ 0	$ 0

Provision In Liew Of Income Tax

Provision In Liew Of Income Taxes (Schedule Of Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Provision In Lieu Of Income Taxes [Abstract]
Deferred tax assets, Employee benefit liabilities	$ 253	$ 233
Deferred tax assets, Regulatory liabilities	45	48
Deferred tax assets, Other	45	47
Total	343	328
Deferred tax liabilities, Property, plant and equipment	2,132	1,994
Deferred tax liabilities, Regulatory assets	274	255
Deferred Tax Liabilities, Other	2	2
Total	2,408	2,251
Liability in lieu of deferred income taxes - net	$ 2,065	$ 1,923

Provision In Lieu Of Income T_4

Provision In Lieu Of Income Taxes (Components Of Income Tax Provisions (Benefits)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Provision In Lieu Of Income Taxes [Abstract]
Current: U.S. federal	$ 79	$ 100	$ 69
Current: State	24	22	22
Deferred: U.S. federal	63	27	49
Amortization of investment tax credits	(1)	(1)	(2)
Total reported in operating expenses	165	148	138
U.S. federal	(17)	(17)	(21)
Deferred federal	5	5	6
Total reported in other income and deductions	(12)	(12)	(15)
Total provision in lieu of income taxes	$ 153	$ 136	$ 123

Provision In Lieu Of Income T_5

Provision In Lieu Of Income Taxes (Schedule Of Income Tax Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Provision In Lieu Of Income Taxes [Abstract]
Income before provision in lieu of income taxes	$ 923	$ 849	$ 774
Provision in lieu of income taxes at the U.S. federal statutory rate of 21% for 2019 and 2018 and 35% for 2017	194	178	163
Amortization of investment tax credits - net of deferred tax effect	(1)	(1)	(2)
Amortization of excess deferred taxes	(52)	(52)	(52)
Texas margin tax, net of federal tax benefit	19	18	17
Nontaxable gains on benefit plan investments	(3)	(2)	(2)
Other	(4)	(5)	(1)
Total provision in lieu of income taxes	$ 153	$ 136	$ 123
Effective rate	16.60%	16.00%	15.90%

Short-Term Borrowings (Narrativ

Short-Term Borrowings (Narrative) (Details) $ in Millions	Feb. 25, 2022	Dec. 31, 2021USD ($)	Nov. 30, 2021USD ($)	Mar. 31, 2018USD ($)
Unsecured Debt [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 2,000
Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 2,000
Extension period for revolving line of credit		1 year
Commitment fee		0.10%
Maximum pricing adjustment on commitment fee, percentage		0.01%
Maximum pricing adjustment on applicable margin, percentage		0.05%
Maximum indebtness amount before default		$ 100
Maximum judgement for payment amount before default		$ 100
Discharge period		60 days
Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Possible additional increase in borrowing capacity amount			100
Libor rate depending on credit ratings		0.00%
Commitment fee		0.075%
Debt to capitalization ratio		0.65
Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Possible additional increase in borrowing capacity amount			$ 400
Libor rate depending on credit ratings		0.50%
Commitment fee		0.225%
Debt to capitalization ratio		1
London Interbank Offered Rate (LIBOR) [Member] | Credit Facility [Member]
Line of Credit Facility [Line Items]
Spread over variable rate		1.00%
London Interbank Offered Rate (LIBOR) [Member] | Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Spread over variable rate	1.00%
London Interbank Offered Rate (LIBOR) [Member] | Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Libor rate depending on credit ratings		0.875%
London Interbank Offered Rate (LIBOR) [Member] | Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Libor rate depending on credit ratings		1.50%
Base Rate [Member] | Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Spread over variable rate	0.00%
Federal Funds Effective Rate [Member] | Credit Facility [Member]
Line of Credit Facility [Line Items]
Spread over variable rate		0.50%

Short-Term Borrowings (Schedule

Short-Term Borrowings (Schedule Of Short-Term Borrowings) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Total credit facility borrowing capacity	$ 2,000	$ 2,000
Available unused credit	1,777	1,921
Commercial Paper [Member]
Short-term Debt [Line Items]
Outstanding	$ (215)	$ (70)
Weighted average interest rate	0.30%	0.17%
Letter of Credit [Member]
Short-term Debt [Line Items]
Outstanding	$ (8)	$ (9)
Weighted average interest rate	1.20%	1.45%

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions

Jan. 28, 2022

Dec. 09, 2021

Nov. 16, 2021

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Feb. 28, 2022

Feb. 23, 2022

Jul. 28, 2021

Jun. 29, 2021

Jun. 25, 2021

May 14, 2021

Apr. 30, 2021

Mar. 31, 2021

Mar. 17, 2021

Feb. 26, 2021

Jan. 29, 2021

Mar. 20, 2020

Long-Term Debt [Line Items]

Repayments of long-term debt

$ 1,290

$ 1,164

$ 1,094

Percentage of fair value of cost of property additions certified to the Deed of Trust collateral agent

85.00%

Available bond credits

$ 2,112

Future debt subject to property additions to the Deed of Trust

4,367

Estimated fair value of our long-term debt including current maturities

11,758

11,638

Carrying amount

10,032

9,229

Secured Debt [Member] | 0.55% Senior Notes Due October 1, 2025 [Member]

Long-Term Debt [Line Items]

Aggregate principal amount

$ 450

$ 450

Interest rate

0.55%

0.55%

Maturity date

Oct. 1, 2025

Oct. 1, 2025

Secured Debt [Member] | 2.75% Senior Notes Due May 15, 2030 [Member]

Long-Term Debt [Line Items]

Aggregate principal amount

$ 300

$ 700

$ 400

$ 400

Interest rate

2.75%

2.75%

Maturity date

May 15, 2030

May 15, 2030

Redemption percentage

100.00%

Secured Debt [Member] | 2.70% Senior Notes Due November 15, 2051 [Member]

Long-Term Debt [Line Items]

Aggregate principal amount

500

$ 500

Interest rate

2.70%

2.70%

Maturity date

Nov. 15, 2051

Nov. 15, 2051

Redemption percentage

100.00%

Secured Debt [Member] | 3.70% Senior Notes Due May 15, 2050 [Member]

Long-Term Debt [Line Items]

Aggregate principal amount

$ 400

$ 400

Interest rate

3.70%

3.70%

Maturity date

May 15, 2050

May 15, 2050

Secured Debt [Member] | Senior 2030 And 2050 Notes [Member]

Long-Term Debt [Line Items]

Increase in annual interest rate

0.50%

Secured Debt [Member] | 7.00% Senior Notes Due May 1, 2032 [Member]

Long-Term Debt [Line Items]

Aggregate principal amount

$ 494

$ 494

Interest rate

7.00%

7.00%

Maturity date

May 1, 2032

May 1, 2032

Secured Debt [Member] | 7.25% Senior Notes Due January 15, 2033 [Member]

Long-Term Debt [Line Items]

Aggregate principal amount

$ 323

$ 323

Interest rate

7.25%

7.25%

Maturity date

Jan. 15, 2033

Jan. 15, 2033

Secured Debt [Member] | 5.30% Senior Notes Due June 1, 2042 [Member]

Long-Term Debt [Line Items]

Aggregate principal amount

$ 348

$ 348

Interest rate

5.30%

5.30%

Maturity date

Jun. 1, 2042

Jun. 1, 2042

Secured Debt [Member] | 5.35% Senior Notes Due October 1, 2052 [Member]

Long-Term Debt [Line Items]

Aggregate principal amount

$ 300

$ 300

Interest rate

5.35%

5.35%

Maturity date

Oct. 1, 2052

Oct. 1, 2052

Secured Debt [Member] | 2022 Notes [Member] | Subsequent Event [Member]

Long-Term Debt [Line Items]

Aggregate principal amount

$ 400

Maturity date

Jun. 1, 2022

Unsecured Debt [Member] | January 2021 Term Loan Credit Agreement Maturing February 28, 2022 [Member]

Long-Term Debt [Line Items]

Repayments of long-term debt

300

Maturity date

Feb. 28, 2022

Unsecured term loan aggregate principal amount

$ 300

Debt principal amount

$ 140

$ 160

Unsecured Debt [Member] | January 2021 Term Loan Credit Agreement Maturing February 28, 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]

Long-Term Debt [Line Items]

Spread over variable rate

0.675%

Unsecured Debt [Member] | January 2021 Term Loan Credit Agreement Maturing February 28, 2022 [Member] | Federal Funds Effective Rate [Member]

Long-Term Debt [Line Items]

Spread over variable rate

0.50%

Unsecured Debt [Member] | January 2021 Term Loan Credit Agreement Maturing February 28, 2022 [Member] | One-Month London Interbank Offered Rate [Member]

Long-Term Debt [Line Items]

Spread over variable rate

1.00%

Unsecured Debt [Member] | March 2021 Term Loan Credit Agreement Maturing May 17, 2022 [Member]

Long-Term Debt [Line Items]

Repayments of long-term debt

450

Maturity date

May 17, 2022

Unsecured term loan aggregate principal amount

$ 450

Debt principal amount

$ 175

$ 105

$ 170

Unsecured Debt [Member] | March 2021 Term Loan Credit Agreement Maturing May 17, 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]

Long-Term Debt [Line Items]

Spread over variable rate

0.65%

Unsecured Debt [Member] | March 2021 Term Loan Credit Agreement Maturing May 17, 2022 [Member] | Federal Funds Effective Rate [Member]

Long-Term Debt [Line Items]

Spread over variable rate

0.50%

Unsecured Debt [Member] | March 2021 Term Loan Credit Agreement Maturing May 17, 2022 [Member] | One-Month London Interbank Offered Rate [Member]

Long-Term Debt [Line Items]

Spread over variable rate

1.00%

Unsecured Debt [Member] | June 2021 Term Loan Credit Agreement Maturing August 15, 2022 [Member]

Long-Term Debt [Line Items]

Repayments of long-term debt

$ 490

$ 50

Maturity date

Aug. 15, 2022

Unsecured term loan aggregate principal amount

$ 540

Debt principal amount

$ 520

$ 20

Unsecured Debt [Member] | June 2021 Term Loan Credit Agreement Maturing August 15, 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]

Long-Term Debt [Line Items]

Spread over variable rate

0.60%

Unsecured Debt [Member] | June 2021 Term Loan Credit Agreement Maturing August 15, 2022 [Member] | Federal Funds Effective Rate [Member]

Long-Term Debt [Line Items]

Spread over variable rate

0.50%

Unsecured Debt [Member] | June 2021 Term Loan Credit Agreement Maturing August 15, 2022 [Member] | One-Month London Interbank Offered Rate [Member]

Long-Term Debt [Line Items]

Spread over variable rate

1.00%

Unsecured Debt [Member] | January 2022 Term Loan Credit Agreement Maturing April 29, 2023 [Member] | Subsequent Event [Member]

Long-Term Debt [Line Items]

Interest rate

4.10%

Maturity date

Apr. 29, 2023

Unsecured term loan aggregate principal amount

$ 1,300

$ 400

Available for borrowing

$ 300

Debt principal amount

$ 400

Irrevocable borrowing

$ 600

Unsecured Debt [Member] | January 2022 Term Loan Credit Agreement Maturing April 29, 2023 [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Subsequent Event [Member]

Long-Term Debt [Line Items]

Spread over variable rate

0.575%

Unsecured Debt [Member] | January 2022 Term Loan Credit Agreement Maturing April 29, 2023 [Member] | One-Month Secured Overnight Financing Rate [Member] | Subsequent Event [Member]

Long-Term Debt [Line Items]

Spread over variable rate

0.10%

Unsecured Debt [Member] | January 2022 Term Loan Credit Agreement Maturing April 29, 2023 [Member] | Federal Funds Effective Rate [Member] | Subsequent Event [Member]

Long-Term Debt [Line Items]

Spread over variable rate

0.50%

Long-Term Debt (Schedule Of Lon

Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Nov. 16, 2021	Jun. 25, 2021	Mar. 17, 2021	Jan. 29, 2021	Mar. 20, 2020
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ (95)	$ (98)
Less amount due currently	(882)
Long-term debt, less amounts due currently	9,150	9,229
Unsecured Debt [Member]
Debt Instrument [Line Items]
Total long-term debt	10,127	9,327
4.10% Senior Notes Due June 1, 2022 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 400	$ 400
Interest rate	4.10%	4.10%
Maturity date	Jun. 1, 2022	Jun. 1, 2022
7.00% Debentures Due September 1, 2022 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 482	$ 482
Interest rate	7.00%	7.00%
Maturity date	Sep. 1, 2022	Sep. 1, 2022
2.75% Senior Notes due June 1, 2024 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 500	$ 500
Interest rate	2.75%	2.75%
Maturity date	Jun. 1, 2024	Jun. 1, 2024
2.95% Senior Notes Due April 1, 2025 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 350	$ 350
Interest rate	2.95%	2.95%
Maturity date	Apr. 1, 2025	Apr. 1, 2025
0.55% Senior Notes Due October 1, 2025 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 450	$ 450
Interest rate	0.55%	0.55%
Maturity date	Oct. 1, 2025	Oct. 1, 2025
3.86% Senior Notes, Series A, due December 3, 2025 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 174	$ 174
Interest rate	3.86%	3.86%
Maturity date	Dec. 3, 2025	Dec. 3, 2025
3.86% Senior Notes, Series B, due January 14, 2026 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 38	$ 38
Interest rate	3.86%	3.86%
Maturity date	Jan. 14, 2026	Jan. 14, 2026
3.70% Senior Notes Due November 15, 2028 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 650	$ 650
Interest rate	3.70%	3.70%
Maturity date	Nov. 15, 2028	Nov. 15, 2028
5.75% Senior Notes Due March 15, 2029 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 318	$ 318
Interest rate	5.75%	5.75%
Maturity date	Mar. 15, 2029	Mar. 15, 2029
2.75% Senior Notes Due May 15, 2030 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 700	$ 400	$ 300				$ 400
Interest rate	2.75%	2.75%
Maturity date	May 15, 2030	May 15, 2030
7.00% Senior Notes Due May 1, 2032 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 494	$ 494
Interest rate	7.00%	7.00%
Maturity date	May 1, 2032	May 1, 2032
7.25% Senior Notes Due January 15, 2033 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 323	$ 323
Interest rate	7.25%	7.25%
Maturity date	Jan. 15, 2033	Jan. 15, 2033
7.50% Senior Notes Due September 1, 2038 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 300	$ 300
Interest rate	7.50%	7.50%
Maturity date	Sep. 1, 2038	Sep. 1, 2038
5.25% Senior Notes Due September 30, 2040 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 475	$ 475
Interest rate	5.25%	5.25%
Maturity date	Sep. 30, 2040	Sep. 30, 2040
4.55% Senior Notes Due December 1, 2041 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 400	$ 400
Interest rate	4.55%	4.55%
Maturity date	Dec. 1, 2041	Dec. 1, 2041
5.30% Senior Notes Due June 1, 2042 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 348	$ 348
Interest rate	5.30%	5.30%
Maturity date	Jun. 1, 2042	Jun. 1, 2042
3.75% Senior Notes Due April 1, 2045 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 550	$ 550
Interest rate	3.75%	3.75%
Maturity date	Apr. 1, 2045	Apr. 1, 2045
3.80% Senior Notes Due September 30, 2047 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 325	$ 325
Interest rate	3.80%	3.80%
Maturity date	Sep. 30, 2047	Sep. 30, 2047
4.10% Senior Notes Due November 15, 2048 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 450	$ 450
Interest rate	4.10%	4.10%
Maturity date	Nov. 15, 2048	Nov. 15, 2048
3.80% Senior Notes, Due June 1, 2049 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 500	$ 500
Interest rate	3.80%	3.80%
Maturity date	Jun. 1, 2049	Jun. 1, 2049
3.10% Senior Notes, Due September 15, 2049 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 700	$ 700
Interest rate	3.10%	3.10%
Maturity date	Sep. 15, 2049	Sep. 15, 2049
3.70% Senior Notes Due May 15, 2050 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 400	$ 400
Interest rate	3.70%	3.70%
Maturity date	May 15, 2050	May 15, 2050
2.70% Senior Notes Due November 15, 2051 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 500		$ 500
Interest rate	2.70%	2.70%
Maturity date	Nov. 15, 2051	Nov. 15, 2051
5.35% Senior Notes Due October 1, 2052 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Fixed rate secured long-term debt	$ 300	$ 300
Interest rate	5.35%	5.35%
Maturity date	Oct. 1, 2052	Oct. 1, 2052
January 2021 Term Loan Credit Agreement Maturing February 28, 2022 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Variable rate unsecured long-term debt						$ 300
Maturity date	Feb. 28, 2022
March 2021 Term Loan Credit Agreement Maturing May 17, 2022 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Variable rate unsecured long-term debt					$ 450
Maturity date	May 17, 2022
June 2021 Term Loan Credit Agreement Maturing August 15, 2022 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Variable rate unsecured long-term debt				$ 540
Maturity date	Aug. 15, 2022

Long-Term Debt (Schedule Of L_2

Long-Term Debt (Schedule Of Long-Term Debt Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Long-Term Debt [Abstract]
2022	$ 882
2024	500
2025	974
2026	38
Thereafter	7,733
Unamortized discount and debt issuance costs	(95)	$ (98)
Total	$ 10,032

Commitments And Contingencies_2

Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating leases treated as capital leases		$ 3
Lease term		20 years
Percentage of full time employees represented by labor union		17.00%
Expiration date of collective bargaining agreement		Oct. 31, 2022
Scenario, Forecast [Member]
Minimum aggregate capital expenditures over the five year period	$ 7,500
Energy efficiency spending amount	$ 49
January 1, 2018 To December 31, 2021 [Member]
Capital expenditures		$ 8,900

Commitments And Contingencies_3

Commitments And Contingencies (Schedule Of Lease Information) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Total operating lease liabilities	$ 170
Weighted-average remaining lease term (in years)	7 years	7 years
Weighted-average discount rate	2.50%	2.80%
Other Noncurrent Assets [Member]
Operating lease ROU, third-party joint project and other assets	$ 146	$ 132
Other Current Liabilities [Member]
Operating lease and other current liabilities	37	29
Other Noncurrent Liabilities [Member]
Operating lease, third-party joint project and other obligations	133	124
Other Liabilities [Member]
Total operating lease liabilities	$ 170	$ 153

Commitments And Contingencies_4

Commitments And Contingencies (Schedule Of Lease Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Commitments And Contingencies [Abstract]
Operating lease costs (including amounts allocated to property, plant and equipment)	$ 51	$ 42	$ 40
Short-term lease costs	11	10	34
Total operating lease costs	62	52	74
Cash paid for amounts included in the measurement of lease liabilities	$ 40	$ 35	$ 32

Commitments And Contingencies_5

Commitments And Contingencies (Schedule Of Operating Lease Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
2022	$ 40
2023	32
2024	25
2025	17
2026	10
Thereafter	56
Total undiscounted lease payments	180
Less imputed interest	(10)
Total future minimum lease payments	170
Other Liabilities [Member]
Total future minimum lease payments	$ 170	$ 153

Membership Interests (Narrative

Membership Interests (Narrative) (Details) - USD ($) $ in Millions	Feb. 17, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 18, 2022
Subsequent Event [Line Items]
Members contribution		$ 705	$ 788	$ 1,978
Current authorized regulatory capitalization ratio, debt		57.50%
Current authorized regulatory capitalization ratio, equity		42.50%
Regulatory capitalization ratio, debt		53.10%
Regulatory capitalization ratio, equity		46.90%
Regulatory liability balance		$ 1,463
Subsequent Event [Member]
Subsequent Event [Line Items]
Members contribution	$ 106
Cash distribution					$ 106

Membership Interests (Schedule

Membership Interests (Schedule Of Cash Capital Contributions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Members contribution	$ 705	$ 788	$ 1,978
February 16, 2021 [Member]
Related Party Transaction [Line Items]
Payment Date	Feb. 16, 2021
Members contribution	$ 63
April 27, 2021 [Member]
Related Party Transaction [Line Items]
Payment Date	Apr. 27, 2021
Members contribution	$ 63
July 27, 2021 [Member]
Related Party Transaction [Line Items]
Payment Date	Jul. 27, 2021
Members contribution	$ 62
October 26, 2021 [Member]
Related Party Transaction [Line Items]
Payment Date	Oct. 26, 2021
Members contribution	$ 67
December 22, 2021 [Member]
Related Party Transaction [Line Items]
Payment Date	Dec. 22, 2021
Members contribution	$ 450

Membership Interests (Schedul_2

Membership Interests (Schedule Of Distributions Paid) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Dividends Payable [Line Items]
Amount	$ 839	$ 356	$ 319
Payment One FY 2020 [Member]
Dividends Payable [Line Items]
Declaration Date	Feb. 17, 2021
Payment Date	Feb. 18, 2021
Amount	$ 96
Payment Two FY 2020 [Member]
Dividends Payable [Line Items]
Declaration Date	Apr. 28, 2021
Payment Date	Apr. 29, 2021
Amount	$ 96
Payment Three FY 2020 [Member]
Dividends Payable [Line Items]
Declaration Date	Jul. 28, 2021
Payment Date	Jul. 29, 2021
Amount	$ 546
Payment Four FY 2020 [Member]
Dividends Payable [Line Items]
Declaration Date	Oct. 27, 2021
Payment Date	Oct. 28, 2021
Amount	$ 101

Membership Interests (Schedul_3

Membership Interests (Schedule Of Changes To Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (151)
Balance at end of period	(131)	$ (151)
Tax benefit cash flow hedges		6	$ 0
Tax expense cash flow hedges reclassified from AOCI	0	1
Cash Flow Hedges - Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(39)	(18)	(16)
Defined benefit pension plans
Cash flow hedges — net decrease in fair value of derivatives (net of tax benefit of $6)		(24)	2
Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax $-)	3	3
Amounts reclassified from AOCI to capital account			(4)
Balance at end of period	(36)	(39)	(18)
Defined Benefit Pension and OPEB Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(112)	(121)	(148)
Defined benefit pension plans	17	9	27
Cash flow hedges — net decrease in fair value of derivatives (net of tax benefit of $6)
Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax $-)
Amounts reclassified from AOCI to capital account
Balance at end of period	(95)	(112)	(121)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(151)	(139)	(164)
Defined benefit pension plans	17	9	27
Cash flow hedges — net decrease in fair value of derivatives (net of tax benefit of $6)		(24)	2
Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax $-)	3	3
Amounts reclassified from AOCI to capital account			(4)
Balance at end of period	$ (131)	$ (151)	$ (139)

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022USD ($)	Dec. 31, 2021USD ($)item	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Defined Benefit Plan Disclosure [Line Items]
Net regulatory asset		$ (1,329)	$ (1,076)
Number of OPEB plans | item		2
Rolling period		4 years
Percentage of gains and losses		25.00%
Second pool representation of total investments, percentage		24.00%
Cash contributions		$ 56	169	$ 76
Thrift Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash contributions		$ 24	23	20
Oncor Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of corporate bonds | item		831
Pension And OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Net regulatory asset		$ 581	966
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average interest crediting rate assumption for Cash Balance Formula		3.00%
Net actuarial gain (loss)		$ 95	(302)	(367)
Actual returns on the plans' assets more than expected return on assets by		69
Amortization of net actuarial (loss)		(52)	(48)	(29)
Expected funding, 2022		5
Expected funding, 2022 to 2026		90
Cash contributions		21	134	41
Pension Plan [Member] | Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial (loss)	$ 32
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)		136	(20)	5
Actual returns on the plans' assets more than expected return on assets by		6
Amortization of net actuarial (loss)		$ (18)	(10)	(19)
Number of corporate bonds | item		307
Expected funding, 2022		$ 35
Expected funding, 2022 to 2026		177
Cash contributions		35	$ 35	$ 35
OPEB Plan [Member] | Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial (loss)	$ 1
OPEB Plan [Member] | Gain Associated To Census Data, Health Care Claims And Trend Assumptions [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)		108
OPEB Plan [Member] | Gain Due To An Increase In Discount Rates [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)		36
OPEB Plan [Member] | Associated With Mortality And Other Demographic Assumption Changes [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)		$ (8)
Oncor Cash Balance Formula Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of employee's contribution match by employer		100.00%
Percentage of employee's contribution matched 100% by employer		6.00%
Oncor Traditional Retirement Plan Formula Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of employee's contribution match by employer		75.00%
Percentage of employee's contribution matched 100% by employer		6.00%

Employee Benefit Plans (Schedul

Employee Benefit Plans (Schedule Of Pension And OPEB Plan Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	$ 95	$ 90	$ 104
Less amounts deferred principally as property, regulatory asset or regulatory liability	(19)	(13)	(27)
Net amounts recognized as operation and maintenance expense or other deductions	76	77	77
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	70	71	63
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	$ 25	$ 19	$ 41

Employee Benefit Plans (Sched_2

Employee Benefit Plans (Schedule Of Detailed Pension And OPEB Benefit Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of net OPEB costs:
Net benefit costs	$ 95	$ 90	$ 104
Pension Plan [Member]
Assumptions Used to Determine Net Periodic Pension and OPEB Costs:
Discount rate	2.40%	3.13%	4.18%
Expected return on plan assets	4.35%	4.94%	5.42%
Rate of compensation increase	4.80%	4.64%	4.53%
Components of net OPEB costs:
Service cost	$ 33	$ 29	$ 25
Interest cost	84	103	128
Expected return on assets	(99)	(109)	(119)
Amortization of net loss	52	48	29
Net benefit costs	70	71	63
Other Changes in Plan Assets and Benefit Obligations Recognized as Regulatory Assets or in Other Comprehensive Income:
Net loss (gain)	(164)	61
Amortization of net loss	(52)	(48)	(29)
Total recognized as regulatory assets or other comprehensive income	(216)	13	(29)
Total recognized in net periodic pension and OPEB costs and as regulatory assets or other comprehensive income	$ (146)	$ 84	$ 34
OPEB Plan [Member]
Assumptions Used to Determine Net Periodic Pension and OPEB Costs:
Discount rate	2.58%	3.29%	4.41%
Expected return on plan assets	5.24%	5.90%	6.19%
Components of net OPEB costs:
Service cost	$ 5	$ 6	$ 6
Interest cost	26	32	43
Expected return on assets	(7)	(8)	(7)
Amortization of prior service cost (credit)	(17)	(20)	(20)
Amortization of net loss	18	10	19
Curtailment cost (credit)		(1)
Net benefit costs	25	19	41
Other Changes in Plan Assets and Benefit Obligations Recognized as Regulatory Assets or in Other Comprehensive Income:
Curtailment		2
Net loss (gain)	(142)	14	(22)
Amortization of net loss	(18)	(10)	(19)
Amortization of prior service (cost) credit	17	20	20
Total recognized as regulatory assets or other comprehensive income	(143)	26	(21)
Total recognized in net periodic pension and OPEB costs and as regulatory assets or other comprehensive income	$ (118)	$ 45	$ 20

Employee Benefit Plans (Sched_3

Employee Benefit Plans (Schedule Of Assumptions Used) (Details)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.75%	2.40%	3.13%
Rate of compensation increase	4.98%	4.80%	4.64%
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.91%	2.58%	3.29%

Employee Benefit Plans (Sched_4

Employee Benefit Plans (Schedule Of Changes In Projected Benefit Obligations And Changes In Fair Value Of Plan) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in Plan Assets:
Employer contributions	$ 56	$ 169	$ 76
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation at beginning of year	3,596	3,400	3,162
Service cost	33	29	25
Interest cost	84	103	128
Participant contributions
Actuarial loss (gain)	(95)	302	367
Benefits paid	(171)	(165)	(164)
Curtailment
Settlements	(89)	(73)	(118)
Projected benefit obligation at end of year	3,358	3,596	3,400
Accumulated benefit obligation at end of year	3,199	3,433	3,283
Change in Plan Assets:
Fair value of assets at beginning of year	2,740	2,494	2,249
Actual return (loss) on assets	168	350	486
Employer contributions	21	134	41
Participant contributions
Benefits paid	(171)	(165)	(164)
Settlements	(89)	(73)	(118)
Fair value of assets at end of year	2,669	2,740	2,494
Funded Status:
Projected benefit obligation at end of year	(3,358)	(3,596)	(3,400)
Fair value of assets at end of year	2,669	2,740	2,494
Funded status at end of year	(689)	(856)	(906)
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation at beginning of year	1,013	999	1,006
Service cost	5	6	6
Interest cost	26	32	43
Participant contributions	19	18	19
Actuarial loss (gain)	(136)	20	(5)
Benefits paid	(66)	(63)	(70)
Curtailment		1
Settlements
Projected benefit obligation at end of year	861	1,013	999
Accumulated benefit obligation at end of year
Change in Plan Assets:
Fair value of assets at beginning of year	145	141	132
Actual return (loss) on assets	13	14	25
Employer contributions	35	35	35
Participant contributions	19	18	19
Benefits paid	(66)	(63)	(70)
Settlements
Fair value of assets at end of year	146	145	141
Funded Status:
Projected benefit obligation at end of year	(861)	(1,013)	(999)
Fair value of assets at end of year	146	145	141
Funded status at end of year	$ (715)	$ (868)	$ (858)

Employee Benefit Plans (Sched_5

Employee Benefit Plans (Schedule Of Amounts Recognized In Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Other noncurrent liabilities	$ (1,503)	$ (1,808)
Accumulated other comprehensive net loss	(131)	(151)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other current liabilities	(5)	(5)
Other noncurrent liabilities	(705)	(863)
Net liability recognized	(710)	(868)
Other noncurrent assets	21	12
Net loss (gain)	355	556
Net regulatory assets recognized	355	556
Net assets recognized	376	568
Accumulated other comprehensive net loss	93	108
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other current liabilities	(12)	(14)
Other noncurrent liabilities	(703)	(854)
Net liability recognized	(715)	(868)
Net loss (gain)	(27)	132
Prior service credit		(16)
Net regulatory assets recognized	(27)	116
Net assets recognized	(27)	116
Accumulated other comprehensive net loss	$ 3	$ 3

Employee Benefit Plans (Sched_6

Employee Benefit Plans (Schedule Of Health Care Cost Trend Rates) (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Not Medicare Eligible [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year	6.70%	6.90%	7.20%
Rate to which the cost trend is expected to decline (the ultimate trend rate)	4.50%	4.50%	4.50%
Year that the rate reaches the ultimate trend rate	2029	2029	2029
Medicare Eligible [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year	7.50%	7.80%	8.00%
Rate to which the cost trend is expected to decline (the ultimate trend rate)	4.50%	4.50%	4.50%
Year that the rate reaches the ultimate trend rate	2031	2030	2029

Employee Benefit Plans (Sched_7

Employee Benefit Plans (Schedule Of Projected Benefit Obligations And Accumulated Benefit Obligations In Excess Of Plan Assets Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations	$ 3,358	$ 3,596
Accumulated benefit obligations	3,199	3,433
Plan assets	2,669	2,740
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations	861	1,013
Plan assets	146	145
Vistra Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations	187	196
Accumulated benefit obligations	185	194
Plan assets	$ 208	$ 208

Employee Benefit Plans (Sched_8

Employee Benefit Plans (Schedule Of Target Asset Allocation Ranges By Asset Category) (Details)	Dec. 31, 2021
International Equities [Member] | Recoverable [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	12.00%
International Equities [Member] | Recoverable [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	20.00%
International Equities [Member] | Nonrecoverable [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	5.00%
International Equities [Member] | Nonrecoverable [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	11.00%
US Equities [Member] | Recoverable [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	15.00%
US Equities [Member] | Recoverable [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	23.00%
US Equities [Member] | Nonrecoverable [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	6.00%
US Equities [Member] | Nonrecoverable [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	12.00%
Real Estate [Member] | Recoverable [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	3.00%
Real Estate [Member] | Recoverable [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	7.00%
Credit Strategies [Member] | Recoverable [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	5.00%
Credit Strategies [Member] | Recoverable [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	9.00%
Credit Strategies [Member] | Nonrecoverable [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	4.00%
Credit Strategies [Member] | Nonrecoverable [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	8.00%
Fixed Income [Member] | Recoverable [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	48.00%
Fixed Income [Member] | Recoverable [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	58.00%
Fixed Income [Member] | Nonrecoverable [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	72.00%
Fixed Income [Member] | Nonrecoverable [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	82.00%

Employee Benefit Plans (Sched_9

Employee Benefit Plans (Schedule Of Assets Fair Value Measured On Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 2,669	$ 2,740	$ 2,494	$ 2,249
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	146	145	$ 141	$ 132
Fair Value, Inputs, Level 1 [Member] | Interest-Bearing Cash [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	9	9
Fair Value, Inputs, Level 1 [Member] | US Equities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	65	220
Fair Value, Inputs, Level 1 [Member] | US Equities [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	16	24
Fair Value, Inputs, Level 1 [Member] | International Equities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	138	330
Fair Value, Inputs, Level 1 [Member] | International Equities [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	17	25
Fair Value, Inputs, Level 1 [Member] | Other [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	16	19
Fair Value, Inputs, Level 1 [Member] | Total [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	203	550
Fair Value, Inputs, Level 1 [Member] | Total [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	58	77
Fair Value, Inputs, Level 2 [Member] | Interest-Bearing Cash [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	9
Fair Value, Inputs, Level 2 [Member] | US Equities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	1	1
Fair Value, Inputs, Level 2 [Member] | International Equities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	1	1
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	879	910
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	37	34
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	55	46
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	2	1
Fair Value, Inputs, Level 2 [Member] | Other [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	50	57
Fair Value, Inputs, Level 2 [Member] | Other [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	2	3
Fair Value, Inputs, Level 2 [Member] | Total [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	995	1,015
Fair Value, Inputs, Level 2 [Member] | Total [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	41	38
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Interest-Bearing Cash [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	9
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Interest-Bearing Cash [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	9	9
Fair Value, Inputs, Level 1, 2 and 3 [Member] | US Equities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	66	221
Fair Value, Inputs, Level 1, 2 and 3 [Member] | US Equities [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	16	24
Fair Value, Inputs, Level 1, 2 and 3 [Member] | International Equities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	139	331
Fair Value, Inputs, Level 1, 2 and 3 [Member] | International Equities [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	17	25
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Corporate Bond Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	879	910
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Corporate Bond Securities [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	37	34
Fair Value, Inputs, Level 1, 2 and 3 [Member] | US Treasury Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	55	46
Fair Value, Inputs, Level 1, 2 and 3 [Member] | US Treasury Securities [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	2	1
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Other [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	50	57
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Other [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	18	22
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Total [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	1,198	1,565
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Total [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets in the fair value hierarchy	99	115
NAV [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,471	1,175
NAV [Member] | OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 47	$ 30

Employee Benefit Plans (Sche_10

Employee Benefit Plans (Schedule Of Expected Long-Term Rate Of Return On Assets Assumptions) (Details)	12 Months Ended
	Dec. 31, 2021
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	4.87%
Pension Plan [Member] | International Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	7.05%
Pension Plan [Member] | US Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	6.10%
Pension Plan [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	5.40%
Pension Plan [Member] | Credit Strategies [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	5.50%
Pension Plan [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	3.07%
Pension Plan [Member] | Oncor Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	4.17%
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	5.61%
OPEB Plan [Member] | 401(h) Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	5.78%
OPEB Plan [Member] | Life Insurance VEBA [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	5.70%
OPEB Plan [Member] | Union VEBA [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	5.70%
OPEB Plan [Member] | Non-union VEBA [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	1.90%
OPEB Plan [Member] | Shared retiree VEBA [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	1.90%
OPEB Plan [Member] | Vistra Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	4.66%

Employee Benefit Plans (Sche_11

Employee Benefit Plans (Schedule Of Contributions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total contributions	$ 56	$ 169	$ 76
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total contributions	21	134	41
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total contributions	$ 35	$ 35	$ 35

Employee Benefit Plans (Sche_12

Employee Benefit Plans (Schedule Of Estimated Future Benefit Payments) (Details) $ in Millions	Dec. 31, 2021USD ($)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2022	$ 181
2023	184
2024	188
2025	191
2026	192
2027-31	950
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2022	45
2023	47
2024	48
2025	48
2026	49
2027-31	$ 241

Related-Party Transactions (Nar

Related-Party Transactions (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Revenue from contracts	$ 4,764,000,000	$ 4,511,000,000	$ 4,347,000,000
Sempra Texas Holdings [Member]
Related Party Transaction [Line Items]
Payments for tax work	$ 116,000	119,000	109,000
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%
Sharyland Distribution & Transmission Services (SDTS) [Member]
Related Party Transaction [Line Items]
Revenue from contracts	$ 10,000,000	13,000,000	9,000,000
Substation monitoring and switching services	$ 592,000	$ 629,000	$ 303,000

Related-Party Transactions (Sch

Related-Party Transactions (Schedule Of Amounts Payable To (Receivables From) Related Parties) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Net payable (receivable)	$ 18	$ 16
Texas [Member]
Related Party Transaction [Line Items]
Texas margin tax payable	24	23
Federal [Member]
Related Party Transaction [Line Items]
Federal income taxes payable (receivable)	(6)	(7)
Sempra Texas Holdings [Member]
Related Party Transaction [Line Items]
Net payable (receivable)	19	17
Sempra Texas Holdings [Member] | Texas [Member]
Related Party Transaction [Line Items]
Texas margin tax payable	24	23
Sempra Texas Holdings [Member] | Federal [Member]
Related Party Transaction [Line Items]
Federal income taxes payable (receivable)	(5)	(6)
Texas Transmission [Member]
Related Party Transaction [Line Items]
Net payable (receivable)	(1)	(1)
Texas Transmission [Member] | Federal [Member]
Related Party Transaction [Line Items]
Federal income taxes payable (receivable)	$ (1)	$ (1)

Related-Party Transactions (S_2

Related-Party Transactions (Schedule Of Cash Payments Made To Related Parties To Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Federal income taxes	$ 61	$ 87	$ 56
Texas margin tax	23	22	22
Total payments (receipts)	84	109	78
Sempra Texas Holdings [Member]
Related Party Transaction [Line Items]
Federal income taxes	49	70	45
Texas margin tax	23	22	22
Total payments (receipts)	72	92	67
Texas Transmission [Member]
Related Party Transaction [Line Items]
Federal income taxes	12	17	11
Total payments (receipts)	$ 12	$ 17	$ 11

Supplementary Financial Infor_3

Supplementary Financial Information (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)customer	Dec. 31, 2020USD ($)customer	Dec. 31, 2019USD ($)
Supplemental Financial Information [Line Items]
Face value of life insurance policies	$ 198	$ 181
Net cash surrender values	$ 99	$ 97
Depreciation expense as percentage of average depreciable property	2.70%	2.70%	2.70%
Aggregate amortization expenses	$ 50	$ 62	$ 52
Goodwill	$ 4,740	$ 4,740
Land Easements [Member]
Supplemental Financial Information [Line Items]
Weighted average remaining useful life	83 years
Capitalized Software [Member]
Supplemental Financial Information [Line Items]
Weighted average remaining useful life	10 years
Customer Concentration Risk [Member] | Trade Accounts Receivable [Member]
Supplemental Financial Information [Line Items]
Number of largest customers | customer	2	2
Customer Concentration Risk [Member] | Trade Accounts Receivable [Member] | REP Subsidiary One [Member]
Supplemental Financial Information [Line Items]
Concentration risk percentage	22.00%	21.00%
Customer Concentration Risk [Member] | Trade Accounts Receivable [Member] | REP Subsidiary Two [Member]
Supplemental Financial Information [Line Items]
Concentration risk percentage	21.00%	15.00%

Supplementary Financial Infor_4

Supplementary Financial Information (Schedule Of Other Deductions And (Income)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Professional fees	$ 9	$ 6	$ 10
InfraREIT Acquisition related costs			9
Recoverable Pension and OPEB—non-service costs	54	55	57
Non-recoverable pension and OPEB	3	4	4
AFUDC equity income	(27)	(29)	(10)
Interest and investment income	(8)	(4)	(5)
Other		1
Other			(2)
Total other deductions and (income)—net	$ 31	$ 33	$ 63

Supplementary Financial Infor_5

Supplementary Financial Information (Schedule Of Interest Expense And Related Charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest	$ 415	$ 413	$ 382
Amortization of debt issuance costs and discounts	11	11	9
Less AFUDC—capitalized interest portion	(13)	(19)	(16)
Total interest expense and related charges	$ 413	$ 405	$ 375

Supplementary Financial Infor_6

Supplementary Financial Information (Schedule Of Trade Accounts And Other Receivables) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Gross trade accounts and other receivables	$ 750	$ 767
Allowance for uncollectible accounts	(12)	(7)
Trade accounts receivable—net	$ 738	$ 760

Supplementary Financial Infor_7

Supplementary Financial Information (Summary of Investments And Other Property) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Assets related to employee benefit plans	$ 133	$ 124
Land	20	16
Other	2	2
Total investments and other property	$ 155	$ 142

Supplementary Financial Infor_8

Supplementary Financial Information (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total assets in service	$ 31,029	$ 28,948
Less accumulated depreciation	8,659	8,336
Net of accumulated depreciation	22,370	20,612
Construction work in progress	557	593
Held for future use	27	20
Property, plant and equipment—net	22,954	21,225
Distribution [Member]
Property, Plant and Equipment [Line Items]
Total assets in service	$ 15,994	14,937
Composite depreciation rate	2.50%
Average Life	39 years 6 months
Transmission [Member]
Property, Plant and Equipment [Line Items]
Total assets in service	$ 13,075	12,156
Composite depreciation rate	2.90%
Average Life	34 years 7 months 6 days
Other Assets [Member]
Property, Plant and Equipment [Line Items]
Total assets in service	$ 1,960	$ 1,855
Composite depreciation rate	5.50%
Average Life	18 years 2 months 12 days

Supplementary Financial Infor_9

Supplementary Financial Information (Schedule Of Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,707	$ 1,650
Accumulated Amortization	568	596
Net	1,139	1,054
Land Easements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	641	623
Accumulated Amortization	117	112
Net	524	511
Capitalized Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,066	1,027
Accumulated Amortization	451	484
Net	$ 615	$ 543

Supplementary Financial Info_10

Supplementary Financial Information (Schedule Of Estimated Aggregate Amortization Expenses) (Details) $ in Millions	Dec. 31, 2021USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
2022	$ 67
2023	67
2024	66
2025	66
2026	$ 66

Supplementary Financial Info_11

Supplementary Financial Information (Schedule Of Operating Lease, Third Party Joint Project And Other Obligations) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating lease liabilities (Notes 1 and 7)	$ 133	$ 124
Investment tax credits	4	5
Third-party joint project obligation (Note 3)		100
Customer deposits—noncurrent	30
Other	64	76
Total operating lease, third-party joint project and other obligations	$ 231	$ 305

Supplementary Financial Info_12

Supplementary Financial Information (Schedule Of Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest	$ 409	$ 406	$ 368
Less capitalized interest	(13)	(19)	(16)
Interest payments (net of amounts capitalized)	396	387	352
Federal	61	87	56
State	23	22	22
Total payments (receipts) in lieu of income taxes	84	109	78
Assets acquired			2,547
Liabilities assumed			(1,223)
Cash paid			1,324
Construction expenditures financed through accounts payable (investing)	254	254	278
Transfer of title to assets constructed for and prepaid by LP&L (investing) (Note 3)	150
ROU assets obtained in exchange for operating lease obligations (investing)	$ 52	72	$ 38
Debt exchange offering (financing)		$ 300

Acquisition Activity (Narrative

Acquisition Activity (Narrative) (Details) - USD ($) $ in Millions	May 16, 2019	Mar. 31, 2020	May 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross				$ 0	$ 0	$ 1,324
Repayment of debt				1,290	1,164	1,094
InfraREIT Acquisition related costs						9
Revenue from contracts				4,764	4,511	4,347
Net income				$ 770	$ 713	651
InfraREIT [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 1,275	$ 1,275
Outstanding debt acquired			953
Repayment of debt			602
BusinessCombinationConsiderationTransferred1	$ 1,324	$ 1,324	1,324
InfraREIT Acquisition related costs						9
Revenue from contracts						156
Net income						58
Pro forma revenues						$ 4,431
InfraREIT [Member] | Secured Debt [Member]
Business Acquisition [Line Items]
Outstanding debt acquired			$ 351

Acquisition Activity (Total Pur

Acquisition Activity (Total Purchase Price Paid) (Details) - USD ($) $ in Millions	May 16, 2019	Mar. 31, 2020	May 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Purchase of outstanding InfraREIT shares and units				$ 0	$ 0	$ 1,324
InfraREIT [Member]
Purchase of outstanding InfraREIT shares and units		$ 1,275	$ 1,275
Certain transaction costs of InfraREIT paid by Oncor through June 30, 2019		53
Total purchase price paid through June 30, 2019		1,328
Adjustments made in the period from June 30, 2019 through March 31, 2020		(4)
Total purchase price paid	$ 1,324	1,324	$ 1,324
Management termination fee		$ 40

Acquisition Activity (Assets An

Acquisition Activity (Assets And Liabilities Assumed) (Details) - USD ($) $ in Millions	May 16, 2019	Mar. 31, 2020	May 31, 2019	Dec. 31, 2021	Dec. 31, 2020
Goodwill				$ 4,740	$ 4,740
InfraREIT [Member]
Current assets	$ 45
Property, plant and equipment—net	1,800
Goodwill	676		$ 676
Regulatory assets	16
Other noncurrent assets	10
Total assets acquired	2,547
Short-term debt	115
Other current liabilities	24
Regulatory liabilities	148
Liability in lieu of deferred income taxes	97
Long-term debt, including due currently	839
Total liabilities assumed	1,223
Net assets acquired	1,324
Total purchase price paid	$ 1,324	$ 1,324	$ 1,324