Oncor Electric Delivery 10-Q 1 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Entity Registrant Name	ONCOR ELECTRIC DELIVERY CO LLC
Entity Central Index Key	1193311
Document Type	10-Q
Document Period End Date	31-Mar-15
Amendment Flag	FALSE
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		0
Oncor's Management and Board of Directors [Member]
Entity Outstanding Membership Interests		0.22%
Oncor Electric Delivery Holdings Company LLC [Member]
Entity Outstanding Membership Interests		80.03%
Texas Transmission and Investment LLC [Member]
Entity Outstanding Membership Interests		19.75%

Condensed_Statements_of_Consol

Condensed Statements of Consolidated Income (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating revenues:
Nonaffiliates	$710	$676
Affiliates	236	241
Total operating revenues	946	917
Operating expenses:
Wholesale transmission service	194	179
Operation and maintenance	186	166
Depreciation and amortization	217	210
Provision in lieu of income taxes (Note 10)	58	63
Taxes other than amounts related to income taxes	111	108
Total operating expenses	766	726
Operating income	180	191
Other income and deductions:
Other income (Note 11)	2	4
Other deductions (Note 11)	4	3
Nonoperating provision in lieu of income taxes		1
Interest income	1	1
Interest expense and related charges (Note 11)	81	88
Net income	$98	$104

Condensed_Statements_of_Consol1

Condensed Statements of Consolidated Comprehensive Income (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Statements Of Consolidated Comprehensive Income [Abstract]
Net income	$98	$104
Other comprehensive income (loss):
Cash flow hedges - derivative value net loss recognized in net income (net of tax expense of $- and $-) (Note 1)	1
Total other comprehensive income (loss)	1
Comprehensive income	$99	$104

Recovered_Sheet1

Condensed Statements Of Consolidated Cash Flows (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows - operating activities:
Net income	$98	$104
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	228	220
Provision in lieu of deferred income taxes - net	-29	-2
Other - net	-1	-1
Changes in operating assets and liabilities:
Deferred revenues (Note 4)	6	1
Changes in other operating assets and liabilities	-139	-124
Cash provided by operating activities	163	198
Cash flows - financing activities:
Issuances of long-term debt (Note 6)	725
Repayments of long-term debt (Note 6)	-530	-28
Net increase in short-term borrowings (Note 5)	89	234
Distributions to members (Note 8)	-100	-53
Debt discount, premium, financing and reacquisition expenses - net	-10	-1
Cash provided by financing activities	174	152
Cash flows - investing activities:
Capital expenditures	-325	-347
Other - net	2	1
Cash used in investing activities	-323	-346
Net change in cash and cash equivalents	14	4
Cash and cash equivalents - beginning balance	4	27
Cash and cash equivalents - ending balance	$18	$31

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$18	$4
Restricted cash - Bondco (Note 11)	58	56
Trade accounts receivable from nonaffiliates - net (Note 11)	417	407
Trade accounts and other receivables from affiliates - net (Note 10)	128	118
Amounts receivable from members related to income taxes (Note 10)	99	180
Materials and supplies inventories - at average cost	79	73
Prepayments and other current assets	90	88
Total current assets	889	926
Restricted cash - Bondco (Note 11)	16	16
Investments and other property (Note 11)	97	97
Property, plant and equipment - net (Note 11)	12,626	12,463
Goodwill (Notes 11)	4,064	4,064
Other noncurrent assets	71	67
Total assets	19,112	19,062
Current liabilities:
Short-term borrowings (Note 5)	800	711
Trade accounts payable to nonaffiliates	158	202
Amounts payable to members related to income taxes (Note 10)	31	24
Accrued taxes other than amounts related to income	66	174
Accrued interest	56	93
Other current liabilities	117	156
Total current liabilities	1,337	1,999
Long-term debt, less amounts due currently (Note 6)	5,720	4,997
Liability in lieu of deferred income taxes (Notes 10)	2,531	2,559
Other noncurrent liabilities and deferred credits (Notes 11)	2,007	1,989
Total liabilities	11,595	11,544
Commitments and contingencies (Note 7)
Membership interests (Note 8):
Capital account — number of interests outstanding 2015 and 2014 - 635,000,000	7,623	7,625
Accumulated other comprehensive loss	-106	-107
Total membership interests	7,517	7,518
Total liabilities and membership interests	19,112	19,062
Oncor
Current assets:
Regulatory assets - net (Note 4)	1,271	1,321
Current liabilities:
Long-term debt due currently (Note 6)		500
Long-term debt, less amounts due currently (Note 6)	5,679	4,956
Bondco
Current assets:
Regulatory assets - net (Note 4)	78	108
Current liabilities:
Long-term debt due currently (Note 6)	109	139
Long-term debt, less amounts due currently (Note 6)	$41	$41

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical)	Mar. 31, 2015	Dec. 31, 2014
Condensed Consolidated Balance Sheets [Abstract]
Capital account, interests outstanding	635,000,000	635,000,000

Description_Of_Business_and_Si

Description Of Business and Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Description Of Business and Significant Accounting Policies [Abstract]
DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES	1.    BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES
	Description of Business
	References in this report to “we,” “our,” “us” and “the company” are to Oncor and/or its subsidiary as apparent in the context.  See “Glossary” for definition of terms and abbreviations.
	We are a regulated electricity transmission and distribution company principally engaged in providing delivery services to REPs, including subsidiaries of TCEH, that sell power in the north-central, eastern and western parts of Texas.  Revenues from TCEH represented 25% and 26% of our total operating revenues for the three months ended March 31, 2015 and 2014, respectively.  We are a direct, majority-owned subsidiary of Oncor Holdings, which is a direct, wholly-owned subsidiary of EFIH, a direct, wholly-owned subsidiary of EFH Corp.  EFH Corp. is a subsidiary of Texas Holdings, which is controlled by the Sponsor Group.  Oncor Holdings owns 80.03% of our membership interests, Texas Transmission owns 19.75% of our membership interests and certain members of our management team and board of directors indirectly own the remaining membership interests through Investment LLC.  We are managed as an integrated business; consequently, there are no separate reportable business segments.
	Our consolidated financial statements include our wholly-owned, bankruptcy-remote financing subsidiary, Bondco, a variable interest entity.  This financing subsidiary was organized for the limited purpose of issuing certain transition bonds in 2003 and 2004.  Bondco issued $1.3 billion principal amount of transition bonds to recover generation-related regulatory asset stranded costs and other qualified costs under an order issued by the PUCT in 2002.
	Various “ring-fencing” measures have been taken to enhance the separateness between the Oncor Ring-Fenced Entities and the Texas Holdings Group and our credit quality.  These measures serve to mitigate our and Oncor Holdings’ credit exposure to the Texas Holdings Group and to reduce the risk that our assets and liabilities or those of Oncor Holdings would be substantively consolidated with the assets and liabilities of the Texas Holdings Group in connection with a bankruptcy of one or more of those entities, including the EFH Bankruptcy Proceedings discussed below.  Such measures include, among other things: our sale of a 19.75% equity interest to Texas Transmission in November 2008; maintenance of separate books and records for the Oncor Ring-Fenced Entities; our board of directors being comprised of a majority of independent directors; and prohibitions on the Oncor Ring-Fenced Entities providing credit support to, or receiving credit support from, any member of the Texas Holdings Group.  The assets and liabilities of the Oncor Ring-Fenced Entities are separate and distinct from those of the Texas Holdings Group, including TXU Energy and Luminant, and none of the assets of the Oncor Ring-Fenced Entities are available to satisfy the debt or contractual obligations of any member of the Texas Holdings Group.  We do not bear any liability for debt or contractual obligations of the Texas Holdings Group, and vice versa.  Accordingly, our operations are conducted, and our cash flows are managed, independently from the Texas Holdings Group.
	EFH Corp. Bankruptcy Proceedings
	On the EFH Petition Date, EFH Corp. and the substantial majority of its direct and indirect subsidiaries that are members of the Texas Holdings Group, including EFIH, EFCH and TCEH, commenced proceedings under Chapter 11 of the US Bankruptcy Code.  The Oncor Ring-Fenced Entities are not parties to the EFH Bankruptcy Proceedings.  We believe the “ring-fencing” measures discussed above mitigate our potential exposure to the EFH Bankruptcy Proceedings.  See Note 2 for a discussion of the potential impacts of the EFH Bankruptcy Proceedings on our financial statements.
	Basis of Presentation
	Our condensed consolidated financial statements have been prepared in accordance with US GAAP and on the same basis as the audited financial statements in our 2014 Form 10-K.  Adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the results of operations and financial position have been included therein.  All intercompany items and transactions have been eliminated in consolidation.  Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with US GAAP have been omitted pursuant to the rules and regulations of the SEC.  Because the condensed consolidated interim financial statements do not include all of the information and footnotes required by US GAAP, they should be read in conjunction with the audited financial statements and related notes in our 2014 Form 10-K.  The results of operations for an interim period may not give a true indication of results for a full year due to seasonality.  All dollar amounts in the financial statements and tables in the notes are stated in millions of US 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.
	Derivative Instruments and Mark-to-Market Accounting
	We have from time-to-time entered into derivative instruments to hedge interest rate risk.  If the instrument meets the definition of a derivative under accounting standards related to derivative instruments and hedging activities, the fair value of each derivative is recognized on the balance sheet as a derivative asset or liability and changes in the fair value are recognized in net income, unless criteria for certain exceptions are met.  This recognition is referred to as “mark-to-market” accounting.
	Reconcilable Tariffs
	The PUCT has designated certain tariffs (TCRF, EECRF surcharges, AMS surcharges and charges related to transition bonds) 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.
	Contingencies
	We evaluate and account for contingencies using the best information available.  A loss contingency is accrued and disclosed when it is probable that an asset has been impaired or a liability incurred and the amount of the loss can be reasonably estimated.  If a range of probable loss is established, the minimum amount in the range is accrued, unless some other amount within the range appears to be a better estimate.  If the probable loss cannot be reasonably estimated, no accrual is recorded, but the loss contingency is disclosed to the effect that the probable loss cannot be reasonably estimated.  A loss contingency will be disclosed when it is reasonably possible that an asset has been impaired or a liability incurred.  If the likelihood that an impairment or incurrence is remote, the contingency is neither accrued nor disclosed.  Gain contingencies are recognized upon realization.
	Changes in Accounting Standards
	In April 2015, the Financial Accounting Standards Board issued a new accounting standard update, which changes the presentation of debt issuance costs in the balance sheet. The update requires that such costs be presented as a direct reduction to the face value of the related debt rather than as an asset.  This will make the presentation of debt issuance costs consistent with debt discounts.  The update is effective for interim and annual periods beginning after December 15, 2015.  Early application is permitted.  When adopted, we anticipate that both other noncurrent assets and long-term debt amounts to decrease by approximately $40 million.

EFH_Bankruptcy_Proceedings

EFH Bankruptcy Proceedings	3 Months Ended
	Mar. 31, 2015
EFH Bankruptcy Proceedings [Abstract]
EFH BANKRUPTCY PROCEEDINGS	2.    EFH BANKRUPTCY PROCEEDINGS
	On the EFH Petition Date, EFH Corp. and the substantial majority of its direct and indirect subsidiaries that are members of the Texas Holdings Group, including EFIH, EFCH and TCEH, commenced proceedings under Chapter 11 of the US Bankruptcy Code.  The Oncor Ring-Fenced Entities are not parties to the EFH Bankruptcy Proceedings.  We believe the “ring-fencing” measures discussed above mitigate our potential exposure to the EFH Bankruptcy Proceedings.
	The US Bankruptcy Code automatically enjoined, or stayed, us from judicial or administrative proceedings or filing of other actions against our affiliates or their property to recover, collect or secure our claims arising prior to the EFH Petition Date.  Following the EFH Petition Date, EFH Corp. received approval from the bankruptcy court to pay or otherwise honor certain prepetition obligations generally designed to stabilize its operations.  Included in the approval were the obligations owed to us representing our prepetition electricity delivery fees.  As of the EFH Petition Date, we estimated that our receivables from the Texas Holdings Group totaled approximately $129 million.  Since that time, we have collected $127 million of the prepetition amount.  We estimate any potential pre-tax loss resulting from the EFH Bankruptcy Proceedings to be immaterial.  As such, a provision for uncollectible accounts from affiliates had not been established as of March 31, 2015.
	Proposed Change in Control of Majority Owner
	In September 2014, with input and support from several key EFH Corp. stakeholders, the debtors in the EFH Bankruptcy Proceedings filed a motion with the bankruptcy court seeking the entry of an order approving bidding procedures that would result in a change in control of Oncor’s indirect majority owner.  During October 2014, the bankruptcy court held hearings regarding the motion. In November 2014, the bankruptcy court conditionally approved the motion.  In January 2015, the bankruptcy court approved the debtors' bidding procedures motion that sets forth the process by which the debtors are authorized to solicit proposals (i.e., bids) from third parties to acquire (in any form and employing any structure, whether taxable (in whole or in part) or tax-free) an indirect equity ownership interest in Oncor in accordance with the US Bankruptcy Code.  These bidding procedures contemplate that the debtors select a stalking horse bid after a two-stage closed bidding process, and, after approval by the bankruptcy court of such stalking horse bid, the debtors conduct a round of open bidding culminating in an auction intended to obtain a higher or otherwise best bid for a transaction.  Initial bids were received in early March 2015 and second round bids were received in April 2015, and the debtors have indicated that they are currently assessing those submissions.  We cannot predict the outcome of this process, including whether the debtors will receive any acceptable bid or whether the bankruptcy court will approve any such bid or whether any such transaction will (or when it will) ultimately close because any such transaction would be the subject of customary closing conditions, including receipt of all applicable regulatory approvals.
	The EFH Bankruptcy Proceedings are a complex litigation matter and the full extent of potential exposure at this time is unknown.  As part of the EFH Bankruptcy Proceedings, on April 14, 2015, EFH Corp. and the other debtors filed with the bankruptcy court a joint plan of reorganization (the “Plan of Reorganization”).  The Plan of Reorganization will determine the rights and satisfaction of claims of various creditors and security holders of EFH Corp. and the other debtors.  The Plan of Reorganization is subject to revision in response to creditor claims and objections, the ultimate outcome of stakeholder negotiations and the requirements of the US Bankruptcy Code or the bankruptcy court.  Bankruptcy courts have broad equitable powers, and as a result, outcomes in bankruptcy proceedings are inherently difficult to predict.  We will continue to evaluate our affiliate transactions and contingencies throughout the EFH Bankruptcy Proceedings to determine any risks and resulting impacts on our financial statements.  In addition, as indicated above, EFH Corp. has been exploring various options regarding potential transactions that potentially could implicate a regulatory review.  We have made some preliminary preparations for potential change in control filings, including discussions with EFH Corp. and others, in light of the proposals in the EFH Bankruptcy Proceedings and the filing of the Plan of Reorganization, but cannot predict the result of any transaction or review.
	See Note 10 for details of our related-party transactions with members of the Texas Holdings Group.

Regulatory_Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2015
Regulatory Matters [Abstract]
REGULATORY MATTERS	3.    REGULATORY MATTERS
	2008 Rate Review
	In August 2009, the PUCT issued a final order with respect to our June 2008 rate review filing with the PUCT and 204 cities based on a test year ended December 31, 2007 (Docket 35717), and new rates were implemented in September 2009.  We and four other parties appealed various portions of the rate review final order to a state district court.  In January 2011, the district court signed its judgment reversing the PUCT with respect to two issues: the PUCT’s disallowance of certain franchise fees and the PUCT’s decision that PURA no longer requires imposition of a rate discount for state colleges and universities.  We filed an appeal with the Texas Third Court of Appeals (Austin Court of Appeals) in February 2011 with respect to the issues we appealed to the district court and did not prevail upon, as well as the district court’s decision to reverse the PUCT with respect to discounts for state colleges and universities.  In early August 2014, the Austin Court of Appeals reversed the district court and affirmed the PUCT with respect to the PUCT’s disallowance of certain franchise fees and the PUCT’s decision that PURA no longer requires imposition of a rate discount for state colleges and universities.  The Austin Court of Appeals also reversed the PUCT and district court’s rejection of a proposed consolidated tax savings adjustment arising out of EFH Corp.’s ability to offset our taxable income against losses from other investments and remanded the issue to the PUCT to determine the amount of the consolidated tax savings adjustment.  In late August 2014, we filed a motion on rehearing with the Austin Court of Appeals with respect to certain appeal issues on which we were not successful, including the consolidated tax savings adjustment.  In December 2014, the Austin Court of Appeals issued its opinion, clarifying that it was rendering judgment on the rate discount for state colleges and universities issue (affirming that PURA no longer requires imposition of the rate discount) rather than remanding it to the PUCT, and dismissing the motions for rehearing regarding the franchise fee issue and the consolidated tax savings adjustment.  We filed a petition for review with the Texas Supreme Court on February 19, 2015, and on April 24, 2015 the court requested that the parties file responses to the petitions for review.  These responses are due by May 26, 2015 unless the parties request, and the court grants, an extension. There is no deadline for the court to act after receipt of these responses.  If our appeals efforts are unsuccessful and the proposed consolidated tax savings adjustment is implemented, we estimate that on remand, the impact on earnings of the consolidated tax savings adjustment’s value could range from zero, as originally determined by the PUCT in Docket 35717, to a $130 million loss (after tax).  We do not believe that any of the other issues ruled upon by the Austin Court of Appeals would result in a material impact to our results of operations or financial condition.
	See Note 3 to Financial Statements in our 2014 Form 10-K for additional information regarding regulatory matters.

Regulatory_Assets_and_Liabilit

Regulatory Assets and Liabilities	3 Months Ended
	Mar. 31, 2015
Regulatory Assets and Liabilities [Abstract]
REGULATORY ASSETS AND LIABILITIES	4.    REGULATORY ASSETS AND LIABILITIES
	Recognition of regulatory assets and liabilities and the amortization periods over which they are expected to be recovered or refunded through rate regulation reflect the decisions of the PUCT.  Components of the regulatory assets and liabilities are provided in the table below.  Amounts not earning a return through rate regulation are noted.
			Remaining Rate Recovery/Amortization Period at		Carrying Amount At
			31-Mar-15		31-Mar-15		31-Dec-14
	Regulatory assets:
	Generation-related regulatory assets securitized		1 year		$	115	$	148
	by transition bonds (a)(e)
	Employee retirement costs		5 years			51		55
	Employee retirement costs to be reviewed (b)(c)		To be determined			257		246
	Employee retirement liability (a)(c)(d)		To be determined			846		865
	Self-insurance reserve (primarily storm recovery		5 years			119		127
	costs) ― net
	Self-insurance reserve to be reviewed ― net (b)(c)		To be determined			264		242
	Securities reacquisition costs		2 years			21		23
	(pre-industry restructure)
	Securities reacquisition costs		Terms of related debt			8		7
	(post-industry restructure) ― net
	Recoverable amounts in lieu of deferred		Life of related asset or liability			13		14
	income taxes ― net
	Deferred conventional meter and metering		Largely 6 years			117		123
	facilities depreciation
	Deferred AMS costs		To be determined			127		113
	Energy efficiency performance bonus (a)		1 year			17		22
	Under-recovered wholesale transmission		1 year			19		26
	service expense ― net (a)
	Other regulatory assets		Various			11		12
	Total regulatory assets					1,985		2,023
	Regulatory liabilities:
	Estimated net removal costs		Life of utility plant			568		531
	Investment tax credit and protected excess		Various			16		18
	deferred taxes
	Over-collection of transition bond revenues (a)(e)		1 year			31		32
	Energy efficiency programs (a)		Not applicable			21		13
	Total regulatory liabilities					636		594
	Net regulatory asset				$	1,349	$	1,429
	____________
		(a)		Not earning a return in the regulatory rate-setting process.
		(b)		Costs incurred since the period covered under the last rate review.
		(c)		Recovery is specifically authorized by statute or by the PUCT, subject to reasonableness review.
		(d)		Represents unfunded liabilities recorded in accordance with pension and OPEB accounting standards.
		(e)		Bondco net regulatory assets of $78 million at March 31, 2015 consisted of $109 million included in generation-related regulatory assets net of the regulatory liability for over-collection of transition bond revenues of $31 million.  Bondco net regulatory assets of $108 million at December 31, 2014 consisted of $140 million included in generation-related regulatory assets net of the regulatory liability for over-collection of transition bond revenues of $32 million.

Borrowings_Under_Credit_Facili

Borrowings Under Credit Facilities	3 Months Ended
	Mar. 31, 2015
Borrowings Under Credit Facilities And Long-Term Debt [Abstract]
BORROWINGS UNDER CREDIT FACILITIES	5.    BORROWINGS UNDER CREDIT FACILITIES
	At March 31, 2015, we had a $2.4 billion secured revolving credit facility to be used for working capital and general corporate purposes, issuances of letters of credit and support for any commercial paper issuances.  The revolving credit facility expires in October 2016, and we have the option of requesting up to two one-year extensions, with such extensions subject to certain conditions and lender approval.  The terms of the revolving credit facility allow us to request an additional increase in our borrowing capacity of $100 million, provided certain conditions are met, including lender approval.
	Borrowings under the revolving credit facility are classified as short-term on the balance sheet and are secured equally and ratably with all of our other secured indebtedness by a first priority lien on property we acquired or constructed for the transmission and distribution of electricity.  The property is mortgaged under the Deed of Trust.
	At March 31, 2015, we had outstanding borrowings under the revolving credit facility totaling $800 million with an interest rate of 1.30% and outstanding letters of credit totaling $7 million.  At December 31, 2014, we had outstanding borrowings under the revolving credit facility totaling $711 million with an interest rate of 1.29% and outstanding letters of credit totaling $7 million.
	Borrowings under the revolving credit facility bear interest at per annum rates equal to, at our option, (i) LIBOR plus a spread ranging from 1.00% to 1.75% depending on credit ratings assigned to our senior secured non-credit enhanced long-term debt or (ii) an alternate base rate (the highest of (1) the prime rate of JPMorgan Chase, (2) the federal funds effective rate plus 0.50%, and (3) daily one-month LIBOR plus 1.00%) plus a spread ranging from 0.00% to 0.75% depending on credit ratings assigned to our senior secured non-credit enhanced long-term debt.  At March 31, 2015, all outstanding borrowings bore interest at LIBOR plus 1.125%.  Amounts borrowed under the revolving credit facility, once repaid, can be borrowed again from time to time.
	An unused commitment fee is payable quarterly in arrears and upon termination or commitment reduction at a rate equal to 0.100% to 0.275% (such spread depending on certain credit ratings assigned to our senior secured debt) of the daily unused commitments under the revolving credit facility.  Letter of credit fees on the stated amount of letters of credit issued under the revolving credit facility are payable to the lenders quarterly in arrears and upon termination at a rate per annum equal to the spread over adjusted LIBOR.  Customary fronting and administrative fees are also payable to letter of credit fronting banks.  At March 31, 2015, letters of credit bore interest at 1.325%, and a commitment fee (at a rate of 0.125% per annum) was payable on the unfunded commitments under the revolving credit facility, each based on our current credit ratings.
	Subject to the limitations described below, borrowing capacity available under the revolving credit facility at March 31, 2015 and December 31, 2014 was $1.593 billion and $1.682 billion, respectively.  Generally, our indentures and revolving credit facility limit the incurrence of other secured indebtedness except for indebtedness secured equally and ratably with the indentures and revolving credit facility and certain permitted exceptions.  As described further in Note 6, the Deed of Trust permits us to secure indebtedness (including borrowings under our revolving credit facility) with the lien of the Deed of Trust.  At March 31, 2015, the available borrowing capacity of the revolving credit facility could be fully drawn.
	The revolving credit facility contains customary covenants for facilities of this type, restricting, subject to certain exceptions, us and our subsidiaries from, among other things: incurring additional liens; entering into mergers and consolidations; and sales of substantial assets.  In addition, the revolving credit facility requires that we maintain a consolidated senior debt-to-capitalization ratio of no greater than 0.65 to 1.00 and observe certain customary reporting requirements and other affirmative covenants.  For purposes of the ratio, debt is calculated as indebtedness defined in the revolving credit facility (principally, the sum of long-term debt, any capital leases, short-term debt and debt due currently in accordance with US GAAP).  The debt calculation excludes transition bonds issued by Bondco, but includes the unamortized fair value discount related to Bondco.  Capitalization is calculated as membership interests determined in accordance with US GAAP plus indebtedness described above.  At March 31, 2015, we were in compliance with this covenant and with all other covenants.

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2015
Borrowings Under Credit Facilities And Long-Term Debt [Abstract]
LONG-TERM DEBT	6.    LONG-TERM DEBT
	At March 31, 2015 and December 31, 2014, our long-term debt consisted of the following:
		March 31,		December 31,
		2015		2014
	Oncor (a):
	6.375% Fixed Senior Notes due January 15, 2015	$	-	$	500
	5.000% Fixed Senior Notes due September 30, 2017		324		324
	6.800% Fixed Senior Notes due September 1, 2018		550		550
	2.150% Fixed Senior Notes due June 1, 2019		250		250
	5.750% Fixed Senior Notes due September 30, 2020		126		126
	4.100% Fixed Senior Notes due June 1, 2022		400		400
	7.000% Fixed Debentures due September 1, 2022		800		800
	2.950% Fixed Senior Notes due April 1, 2025		350		-
	7.000% Fixed Senior Notes due May 1, 2032		500		500
	7.250% Fixed Senior Notes due January 15, 2033		350		350
	7.500% Fixed Senior Notes due September 1, 2038		300		300
	5.250% Fixed Senior Notes due September 30, 2040		475		475
	4.550% Fixed Senior Notes due December 1, 2041		400		400
	5.300% Fixed Senior Notes due June 1, 2042		500		500
	3.750% Fixed Senior Notes due April 1, 2045		375		-
	Unamortized discount		-21		-19
	Less amount due currently		-		-500
	Long-term debt, less amounts due currently — Oncor		5,679		4,956
	Bondco (b):
	5.420% Fixed Series 2003 Bonds due in semiannual installments through August 15, 2015		24		54
	5.290% Fixed Series 2004 Bonds due in semiannual installments through May 15, 2016		126		126
	Less amount due currently		-109		-139
	Long-term debt, less amounts due currently — Bondco		41		41
	Total long-term debt, less amounts due currently	$	5,720	$	4,997
	__________
	(a)   Secured by first priority lien on certain transmission and distribution assets equally and ratably with all of Oncor’s other secured indebtedness.  See “Deed of Trust” below for additional information.
	(b)   The transition bonds are nonrecourse to Oncor and were issued to securitize a regulatory asset.
	Debt-Related Activity in 2015
	Debt Repayments
	Repayments of long-term debt in the three months ended March 31, 2015 totaled $530 million representing $500 million aggregate principal amount of 6.375% senior secured notes paid at the scheduled maturity date of January 15, 2015 and $30 million representing transition bond principal payments at scheduled maturity dates.
	Issuance of New Senior Secured Notes
	In March 2015, we issued $350 million aggregate principal amount of 2.950% senior secured notes maturing in April 2025  (2025 Notes) and $375 million aggregate principal amount of 3.750% senior secured notes maturing in April 2045  (2045 Notes, and together with the 2025 Notes, the Notes).  We used the proceeds (net of the initial purchasers’ discount, fees and expenses) of approximately $714 million from the sale of the Notes to repay borrowings under our revolving credit facility and for other general corporate purposes.  The Notes are secured by a first priority lien, and are secured equally and ratably with all of our other secured indebtedness.
	Interest on the Notes is payable in cash semiannually in arrears on April 1 and October 1 of each year, beginning on October 1, 2015.  Prior to January 1, 2025, in the case of the 2025 Notes, and October 1, 2044, in the case of the 2045 Notes, we may at our option at any time redeem all or part of the Notes at a price equal to 100% of their principal amount, plus accrued and unpaid interest and a make-whole premium.  On and after January 1, 2025, in the case of the 2025 Notes, and October 1, 2044, in the case of the 2045 Notes, Oncor may redeem the 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 Notes also contain customary events of default, including failure to pay principal or interest on the Notes when due.
	The Notes were issued in a private placement and were not registered under the Securities Act.  We have agreed, subject to certain exceptions, to register with the SEC notes having substantially identical terms as the Notes (except for provisions relating to the transfer restriction and payment of additional interest) as part of an offer to exchange freely tradable exchange notes for the Notes.  We have agreed to use commercially reasonable efforts to cause the exchange offer to be completed within 315 days after the issue date of the Notes.  If a registration statement for the exchange offer is not declared effective by the SEC within 270 days after the issue date of the Notes or the exchange offer is not completed within 315 days after the issue date of the Notes (an exchange default), then the annual interest rate on the Notes will increase 50 basis points per annum until the earlier of the expiration of the exchange default or the second anniversary of the issue date of the Notes.
	Deed of Trust
	Our secured indebtedness, including the revolving credit facility described in Note 5, is secured equally and ratably by a first priority lien on property we acquired or constructed for the transmission and distribution of electricity.  The property is mortgaged under the Deed of Trust.  The Deed of Trust permits us to secure indebtedness (including borrowings under our revolving credit facility) with the lien of the Deed of Trust up to the aggregate of (i) the amount of available bond credits, and (ii) 85% of the lower of the fair value or cost of certain property additions that could be certified to the Deed of Trust collateral agent.  At March 31, 2015, the amount of available bond credits was approximately $2.618 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 $900 million.
	Fair Value of Long-Term Debt
	At March 31, 2015 and December 31, 2014, the estimated fair value of our long-term debt (including current maturities) totaled $7.084 billion and $6.844 billion, respectively, and the carrying amount totaled $5.829 billion and $5.636 billion, respectively.  The fair value is estimated based upon the market value as determined by quoted market prices, representing Level 1 valuations under accounting standards related to the determination of fair value.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies [Abstract]
COMMITMENTS AND CONTINGENCIES	7.    COMMITMENTS AND CONTINGENCIES
	EFH Bankruptcy Proceedings
	On the EFH Petition Date, EFH Corp. and the substantial majority of its direct and indirect subsidiaries that are members of the Texas Holdings Group, including EFIH, EFCH and TCEH, commenced proceedings under Chapter 11 of the US Bankruptcy Code.  The Oncor Ring-Fenced Entities are not parties to the EFH Bankruptcy Proceedings.  See Notes 2 and 10 for a discussion of the potential impacts on us as a result of the EFH Bankruptcy Proceedings and our related-party transactions involving members of the Texas Holdings Group, respectively.
	Legal/Regulatory Proceedings
	We are involved in various legal and administrative proceedings in the normal course of business, the ultimate resolution of which, in the opinion of management, should not have a material effect upon our financial position, results of operations or cash flows.  See Note 3 in this report and Note 8 to Financial Statements in our 2014 Form 10-K for additional information regarding our legal and regulatory proceedings.

Membership_Interests

Membership Interests	3 Months Ended
	Mar. 31, 2015
Membership Interests [Abstract]
MEMBERSHIP INTERESTS	8.    MEMBERSHIP INTERESTS
	Cash Distributions
	Distributions are limited by our required regulatory capital structure to be at or below the assumed debt-to-equity ratio established periodically by the PUCT for ratemaking purposes, which is currently set at 60% debt to 40% equity.  At March 31, 2015, $37 million was available for distribution to our members as our regulatory capitalization ratio was 59.8% debt and 40.2% equity.  The PUCT has the authority to determine what types of debt and equity are included in a utility’s debt-to-equity ratio.  For purposes of this ratio, debt is calculated as long-term debt plus unamortized gains on reacquired debt less unamortized issuance expenses, premiums and losses on reacquired debt.  The debt calculation excludes transition bonds issued by Bondco.  Equity is calculated as membership interests determined in accordance with US GAAP, excluding the effects of purchase accounting (which included recording the initial goodwill and fair value adjustments and the subsequent related impairments and amortization).
	On April 29, 2015, our board of directors declared a cash distribution of $65 million, to be paid to our members in  May 2015.  In February 2015, our board of directors declared, and we paid a cash distribution of $100 million to our members.
	Membership Interests
	The following tables present the changes to membership interests during the three months ended March 31, 2015 and 2014:
		Capital Accounts			Accumulated Other Comprehensive Income (Loss)			Total Membership Interests
	Balance at December 31, 2014	$	7,625		$	-107		$	7,518
	Net income		98			-			98
	Distributions		-100			-			-100
	Net effects of cash flow hedges (net of tax)		-			1			1
	Balance at March 31, 2015	$	7,623		$	-106		$	7,517
		Capital Accounts			Accumulated Other Comprehensive Income (Loss)			Total Membership Interests
	Balance at December 31, 2013	$	7,457		$	-48		$	7,409
	Net income		104			-			104
	Distributions		-53			-			-53
	Balance at March 31, 2014	$	7,508		$	-48		$	7,460
	Accumulated Other Comprehensive Income (Loss)
	The following table presents the changes to accumulated other comprehensive income (loss) for the three months ended March 31, 2015:
		Cash Flow Hedges – Interest Rate Swap				Defined Benefit Pension and OPEB Plans			Accumulated Other Comprehensive Income (Loss)
	Balance at December 31, 2014	$		-24		$	-83		$	-107
	Defined benefit pension plans (net of tax)			-			-			-
	Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges			1			-			1
	Balance at March 31, 2015	$		-23		$	-83		$	-106
	There were no changes to accumulated other comprehensive income (loss) for the three months ended March 31, 2014.

Pension_and_Other_Postretireme

Pension and Other Postretirement Employee Benefits (OPEB) Plans	3 Months Ended
	Mar. 31, 2015
Pension And Other Postretirement Employee Benefits (OPEB) Plans [Abstract]
PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS (OPEB) PLANS	9.    PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS PLANS
	We participate in and have liabilities under the Oncor Retirement Plan and the EFH Retirement Plan, both of which are qualified pension plans under Section 401(a) of the Internal Revenue Code of 1986, as amended (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 Treasury bonds.  Under the Cash Balance Formula, future increases in earnings will not apply to prior service costs. See Note 10 to Financial Statements in our 2014 Form 10-K for additional information regarding our pension plans and the EFH OPEB Plan.
	In April 2014, we entered into an agreement with EFH Corp. in which we agreed to transfer to the Oncor OPEB Plan effective July 1, 2014, the assets and liabilities related to our eligible current and future retirees as well as certain eligible retirees of EFH Corp. whose employment included service with both Oncor (or a predecessor regulated electric business) and a non-regulated business of EFH Corp.  Pursuant to the agreement, EFH Corp. will retain its portion of the liability for retiree benefits related to those retirees.  Since the Oncor OPEB Plan offers identical coverages as the EFH OPEB Plan and we and EFH Corp. retain the same responsibility for participants as before, there was no financial impact as a result of the transfer other than from a remeasurement of the Oncor OPEB Plan’s asset values and obligations.  As we are not responsible for EFH Corp.’s portion of the Oncor OPEB Plan’s unfunded liability, that amount is not reported on our balance sheet.
	Our net costs related to pension and OPEB plans for the three months ended March 31, 2015 and 2014 were comprised of the following:
		Three Months Ended March 31,
		2015		2014
	Components of net allocated pension costs:
	Service cost	$	6	$	6
	Interest cost		33		33
	Expected return on assets		-29		-34
	Amortization of net loss		16		10
	Net pension costs		26		15
	Components of net OPEB costs:
	Service cost		2		2
	Interest cost		11		11
	Expected return on assets		-3		-3
	Amortization of prior service cost		-5		-5
	Amortization of net loss		8		6
	Net OPEB costs		13		11
	Total net pension and OPEB costs		39		26
	Less amounts deferred principally as property or a regulatory asset		-28		-17
	Net amounts recognized as expense	$	11	$	9
	The discount rates reflected in net pension and OPEB costs in 2015 are 3.95%, 4.19% and 4.23% for the Oncor Retirement Plan, the EFH Retirement Plan and the OPEB plans, respectively.  The expected return on pension and OPEB plan assets reflected in the 2015 cost amounts are 5.25%, 5.38% and 6.65% for the Oncor Retirement Plan, the EFH Retirement Plan and the OPEB plans, respectively.
	We made cash contributions to the pension plans and OPEB plans of $1 million and $8 million, respectively, during the three months ended March 31, 2015, and we expect to make additional cash contributions to the pension plans and OPEB plans of $44 million and $17 million, respectively, during the remainder of 2015.

RelatedParty_Transactions

Related-Party Transactions	3 Months Ended
	Mar. 31, 2015
Related-Party Transactions [Abstract]
RELATED-PARTY TRANSACTIONS	10.   RELATED-PARTY TRANSACTIONS
	The following represent our significant related-party transactions.  See Note 2 for additional information regarding related-party contingencies resulting from the EFH Bankruptcy Proceedings.
		·		We record revenue from TCEH, principally for electricity delivery fees, which totaled $236 million and $241 million for the three months ended March 31, 2015 and 2014, respectively.  The fees are based on rates regulated by the PUCT that apply to all REPs.  These revenues included less than $1 million for each of the three-month periods ended March 31, 2015 and 2014 pursuant to a transformer maintenance agreement with TCEH.  The balance sheets at March 31, 2015 and December 31, 2014 reflect trade accounts and other receivables from affiliates – net totaling $128 million ($42 million of which was unbilled) and $118 million ($52 million of which was unbilled), respectively, primarily consisting of trade receivables from TCEH related to these electricity delivery fees.
	Trade accounts and other receivables from EFH Corp. affiliates – net reported on our balance sheet consisted of the following:
			At March 31,				At December 31,
			2015				2014
	Trade accounts and other receivables from affiliates		$			131	$		123
	Trade accounts and other payables to affiliates					-3			-5
	Trade accounts and other receivables from affiliates – net		$			128	$		118
		·		EFH Corp. subsidiaries charge us for certain administrative services at cost.  Our payments to EFH Corp. subsidiaries for administrative services, which are primarily reported in operation and maintenance expenses, totaled $5 million and $8 million for the three months ended March 31, 2015 and 2014, respectively.  We also charge each other for shared facilities at cost.  Our payments to EFH Corp. for shared facilities totaled $1 million for the each of the three-month periods ended March 31, 2015 and 2014.  Payments we received from EFH Corp. subsidiaries related to shared facilities totaled less than $1 million for the each of the three-month periods ended March 31, 2015 and 2014.
		·		Through June 30, 2014, we participated in the Energy Future Holdings Health and Welfare Benefit Program, which provided employee benefits to our workforce.  In October 2013, we notified EFH Corp. of our intention to withdraw from the benefit program effective June 30, 2014 and entered into an agreement with EFH Corp. pursuant to which, we agreed to pay EFH Corp. $1 million to reimburse EFH Corp. for its increased costs under the program as a result of our withdrawal from the program and the additional administrative work required to effectuate our withdrawal from the benefit program and transition to the new benefit program. This one-time payment was paid to EFH Corp. in June 2014.  In April 2014, we entered into a welfare benefit administration agreement with EFH Corp., pursuant to which EFH Corp. would continue to provide us with welfare benefit administration services under our new benefit plans from July 1, 2014 until December 31, 2014.
		·		We are not a member of EFH Corp.’s consolidated tax group, but EFH Corp.’s consolidated federal income tax return includes EFH Corp.’s portion of our results due to EFH Corp.’s equity ownership in us.  Under the terms of a tax sharing agreement among us, Oncor Holdings, Texas Transmission, Investment LLC and EFH Corp., we are generally obligated to make payments to Texas Transmission, Investment LLC and EFH Corp., 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.  For periods prior to the tax sharing agreement (entered into in October 2007 and amended and restated in November 2008), we are responsible for our share, if any, of redetermined tax liability for the EFH Corp. consolidated tax group.  EFH Corp. also includes our results in its consolidated Texas margin tax payments, which are accounted for as income taxes and calculated as if we were filing our own return.  See discussion in Note 1 to Financial Statements in our 2014 Form 10-K under “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.  No income tax payments were made to or received from members in the three months ended March 31, 2015 and 2014.
	Amounts payable to (receivable from) members related to income taxes under the tax sharing agreement and reported on our balance sheet consisted of the following:
		At March 31, 2015								At December 31, 2014
		EFH Corp.			Texas Transmission		Total			EFH Corp.		Texas Transmission		Total
	Federal income taxes receivable	$	-79		$	-20	$	-99		$	-144	$	-36	$	-180
	Texas margin taxes payable		31			-		31			24		-		24
	Net payable (receivable)	$	-48		$	-20	$	-68		$	-120	$	-36	$	-156
		·		Our PUCT-approved tariffs include requirements to assure adequate credit worthiness of any REP to support the REP’s obligation to collect transition bond-related charges on behalf of Bondco.  Under these tariffs, as a result of TCEH’s credit rating being below investment grade, TCEH is required to post collateral support in an amount equal to estimated transition charges over specified time periods.  Accordingly, at both March 31, 2015 and December 31, 2014, TCEH had posted security in the amount of $9 million for our benefit.
		·		Under Texas regulatory provisions, the trust fund for decommissioning TCEH’s Comanche Peak nuclear generation facility is funded by a delivery fee surcharge we collect from REPs and remit monthly to TCEH.  Delivery fee surcharges totaled $4 million for each of the three-month periods ended March 31, 2015 and 2014.  Our sole obligation with regard to nuclear decommissioning is as the collection agent of funds charged to ratepayers for nuclear decommissioning activities.  If, at the time of decommissioning, actual decommissioning costs exceed available trust funds, we would not be obligated to pay any shortfalls but would be required to collect any rates approved by the PUCT to recover any additional decommissioning costs.  Further, if there were to be a surplus when decommissioning is complete, such surplus would be returned to ratepayers under terms prescribed by the PUCT.
		·		Affiliates of the Sponsor Group have (1) sold, acquired or participated in the offerings of our debt or debt securities in open market transactions or through loan syndications, and (2) performed various financial advisory, dealer, commercial banking and investment banking services for us and certain of our affiliates for which they have received or will receive customary fees and expenses, and may from time to time in the future participate in any of the items in (1) and (2) above.
	See Note 8 for information regarding distributions to members and Note 9 for information regarding our participation in EFH Corp. pension and OPEB plans and transactions with EFH Corp. involving employee benefit matters.

Supplementary_Financial_Inform

Supplementary Financial Information	3 Months Ended
	Mar. 31, 2015
Supplementary Financial Information [Abstract]
SUPPLEMENTARY FINANCIAL INFORMATION	11.   SUPPLEMENTARY FINANCIAL INFORMATION
	Major Customers
	Revenues from TCEH represented 25% and 26% of our total operating revenues for the three months ended March 31, 2015 and 2014, respectively. Revenues from REP subsidiaries of NRG Energy, Inc., a nonaffiliated entity, collectively represented 17% and 15% of our total operating revenues for the three months ended March 31, 2015 and 2014, respectively. No other customer represented 10% or more of our total operating revenues.
	Other Income and Deductions
			Three Months Ended March 31,
			2015			2014
	Other income:
	Accretion of fair value adjustment (discount) to regulatory assets due to purchase accounting		$	2		$	3
	Other			-			1
	Total other income		$	2		$	4
	Other deductions:
	Professional fees		$	2		$	3
	Other			2			-
	Total other deductions		$	4		$	3
	Interest Expense and Related Charges
			Three Months Ended March 31,
			2015			2014
	Interest expense		$	81		$	89
	Amortization of debt issuance costs and discounts			1			1
	Allowance for funds used during construction – capitalized interest portion			-1			-2
	Total interest expense and related charges		$	81		$	88
	Restricted Cash
	All restricted cash amounts reported on our balance sheet at March 31, 2015 and December 31, 2014 relate to the transition bonds.
	Trade Accounts and Other Receivables
	Trade accounts and other receivables reported on our balance sheet consisted of the following:
			At March 31,			At December 31,
			2015			2014
	Gross trade accounts and other receivables		$	548		$	528
	Trade accounts and other receivables from affiliates			-128			-118
	Allowance for uncollectible accounts			-3			-3
	Trade accounts receivable from nonaffiliates – net		$	417		$	407
	Gross trade accounts receivable at March 31, 2015 and December 31, 2014 included unbilled revenues of $152 million and $182 million, respectively.  At March 31, 2015 and December 31, 2014, REP subsidiaries of NRG Energy, Inc., a nonaffiliated entity, collectively represented approximately 14% and 12% of the nonaffiliated trade accounts receivable amount, respectively.
	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.  Due to commitments made to the PUCT in 2007, we are not allowed to recover bad debt expense, or certain other costs and expenses, from ratepayers in the event of a default or bankruptcy by an affiliate REP.
	Investments and Other Property
	Investments and other property reported on our balance sheet consisted of the following:
			At March 31,			At December 31,
			2015			2014
	Assets related to employee benefit plans, including employee savings		$	94		$	94
	programs
	Land			3			3
	Total investments and other property		$	97		$	97
	Property, Plant and Equipment
	Property, plant and equipment reported on our balance sheet consisted of the following:
			At March 31,			At December 31,
			2015			2014
	Total assets in service		$	18,412		$	18,238
	Less accumulated depreciation			6,231			6,125
	Net of accumulated depreciation			12,181			12,113
	Construction work in progress			430			335
	Held for future use			15			15
	Property, plant and equipment – net		$	12,626		$	12,463
	Intangible Assets
	Intangible assets (other than goodwill) reported on our balance sheet consisted of the following:
		At March 31, 2015								At December 31, 2014
		Gross								Gross
		Carrying			Accumulated					Carrying		Accumulated
		Amount			Amortization			Net		Amount		Amortization		Net
	Identifiable intangible assets subject to amortization included in property, plant and equipment:
	Land easements	$	464		$	87		$	377	$	463	$	86	$	377
	Capitalized software		445			256			189		433		242		191
	Total	$	909		$	343		$	566	$	896	$	328	$	568
	Aggregate amortization expense for intangible assets totaled $16 million and $14 million for the three months ended March 31, 2015 and 2014, respectively.  The estimated aggregate amortization expense for each of the next five fiscal years is as follows:
	Year					Amortization Expense
	2015					$	64
2016						61
2017						52
2018						47
2019						44
At both March 31, 2015 and December 31, 2014, goodwill totaling $4.1 billion was reported on our balance sheet.  None of this goodwill is being deducted for tax purposes.
Other Noncurrent Liabilities and Deferred Credits
Other noncurrent liabilities and deferred credits reported on our balance sheet consisted of the following:
		At March 31,			At December 31,
		2015			2014
Retirement plans and other employee benefits		$	1,906		$	1,894
Uncertain tax positions (including accrued interest)			2			2
Amount payable related to income taxes			17			17
Investment tax credits			17			17
Other			65			59
Total other noncurrent liabilities and deferred credits		$	2,007		$	1,989
Supplemental Cash Flow Information
		Three Months Ended March 31,
		2015			2014
Cash payments (receipts) related to:
Interest		$	118		$	119
Capitalized interest			-1			-2
Interest (net of amounts capitalized)		$	117		$	117
Noncash construction expenditures (a)		$	60		$	35
_____________
	(a)		Represents end-of-period accruals.

Description_Of_Business_and_Si1

Description Of Business and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Description Of Business and Significant Accounting Policies [Abstract]
Description Of Business	Description of Business
	References in this report to “we,” “our,” “us” and “the company” are to Oncor and/or its subsidiary as apparent in the context.  See “Glossary” for definition of terms and abbreviations.
	We are a regulated electricity transmission and distribution company principally engaged in providing delivery services to REPs, including subsidiaries of TCEH, that sell power in the north-central, eastern and western parts of Texas.  Revenues from TCEH represented 25% and 26% of our total operating revenues for the three months ended March 31, 2015 and 2014, respectively.  We are a direct, majority-owned subsidiary of Oncor Holdings, which is a direct, wholly-owned subsidiary of EFIH, a direct, wholly-owned subsidiary of EFH Corp.  EFH Corp. is a subsidiary of Texas Holdings, which is controlled by the Sponsor Group.  Oncor Holdings owns 80.03% of our membership interests, Texas Transmission owns 19.75% of our membership interests and certain members of our management team and board of directors indirectly own the remaining membership interests through Investment LLC.  We are managed as an integrated business; consequently, there are no separate reportable business segments.
	Our consolidated financial statements include our wholly-owned, bankruptcy-remote financing subsidiary, Bondco, a variable interest entity.  This financing subsidiary was organized for the limited purpose of issuing certain transition bonds in 2003 and 2004.  Bondco issued $1.3 billion principal amount of transition bonds to recover generation-related regulatory asset stranded costs and other qualified costs under an order issued by the PUCT in 2002.
	Various “ring-fencing” measures have been taken to enhance the separateness between the Oncor Ring-Fenced Entities and the Texas Holdings Group and our credit quality.  These measures serve to mitigate our and Oncor Holdings’ credit exposure to the Texas Holdings Group and to reduce the risk that our assets and liabilities or those of Oncor Holdings would be substantively consolidated with the assets and liabilities of the Texas Holdings Group in connection with a bankruptcy of one or more of those entities, including the EFH Bankruptcy Proceedings discussed below.  Such measures include, among other things: our sale of a 19.75% equity interest to Texas Transmission in November 2008; maintenance of separate books and records for the Oncor Ring-Fenced Entities; our board of directors being comprised of a majority of independent directors; and prohibitions on the Oncor Ring-Fenced Entities providing credit support to, or receiving credit support from, any member of the Texas Holdings Group.  The assets and liabilities of the Oncor Ring-Fenced Entities are separate and distinct from those of the Texas Holdings Group, including TXU Energy and Luminant, and none of the assets of the Oncor Ring-Fenced Entities are available to satisfy the debt or contractual obligations of any member of the Texas Holdings Group.  We do not bear any liability for debt or contractual obligations of the Texas Holdings Group, and vice versa.  Accordingly, our operations are conducted, and our cash flows are managed, independently from the Texas Holdings Group.
EFH Corp. Bankruptcy Proceedings	EFH Corp. Bankruptcy Proceedings
	On the EFH Petition Date, EFH Corp. and the substantial majority of its direct and indirect subsidiaries that are members of the Texas Holdings Group, including EFIH, EFCH and TCEH, commenced proceedings under Chapter 11 of the US Bankruptcy Code.  The Oncor Ring-Fenced Entities are not parties to the EFH Bankruptcy Proceedings.  We believe the “ring-fencing” measures discussed above mitigate our potential exposure to the EFH Bankruptcy Proceedings.  See Note 2 for a discussion of the potential impacts of the EFH Bankruptcy Proceedings on our financial statements.
Basis Of Presentation	Basis of Presentation
	Our condensed consolidated financial statements have been prepared in accordance with US GAAP and on the same basis as the audited financial statements in our 2014 Form 10-K.  Adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the results of operations and financial position have been included therein.  All intercompany items and transactions have been eliminated in consolidation.  Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with US GAAP have been omitted pursuant to the rules and regulations of the SEC.  Because the condensed consolidated interim financial statements do not include all of the information and footnotes required by US GAAP, they should be read in conjunction with the audited financial statements and related notes in our 2014 Form 10-K.  The results of operations for an interim period may not give a true indication of results for a full year due to seasonality.  All dollar amounts in the financial statements and tables in the notes are stated in millions of US 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.
Derivative Instruments And Mark-To-Market Accounting	Derivative Instruments and Mark-to-Market Accounting
	We have from time-to-time entered into derivative instruments to hedge interest rate risk.  If the instrument meets the definition of a derivative under accounting standards related to derivative instruments and hedging activities, the fair value of each derivative is recognized on the balance sheet as a derivative asset or liability and changes in the fair value are recognized in net income, unless criteria for certain exceptions are met.  This recognition is referred to as “mark-to-market” accounting.
Reconcilable Tariffs	Reconcilable Tariffs
	The PUCT has designated certain tariffs (TCRF, EECRF surcharges, AMS surcharges and charges related to transition bonds) 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.
Contingencies	Contingencies
	We evaluate and account for contingencies using the best information available.  A loss contingency is accrued and disclosed when it is probable that an asset has been impaired or a liability incurred and the amount of the loss can be reasonably estimated.  If a range of probable loss is established, the minimum amount in the range is accrued, unless some other amount within the range appears to be a better estimate.  If the probable loss cannot be reasonably estimated, no accrual is recorded, but the loss contingency is disclosed to the effect that the probable loss cannot be reasonably estimated.  A loss contingency will be disclosed when it is reasonably possible that an asset has been impaired or a liability incurred.  If the likelihood that an impairment or incurrence is remote, the contingency is neither accrued nor disclosed.  Gain contingencies are recognized upon realization.
Changes In Accounting Standards	Changes in Accounting Standards
	In April 2015, the Financial Accounting Standards Board issued a new accounting standard update, which changes the presentation of debt issuance costs in the balance sheet. The update requires that such costs be presented as a direct reduction to the face value of the related debt rather than as an asset.  This will make the presentation of debt issuance costs consistent with debt discounts.  The update is effective for interim and annual periods beginning after December 15, 2015.  Early application is permitted.  When adopted, we anticipate that both other noncurrent assets and long-term debt amounts to decrease by approximately $40 million.

Regulatory_Assets_and_Liabilit1

Regulatory Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Regulatory Assets and Liabilities [Abstract]
Components Of Regulatory Assets And Liabilities
			Remaining Rate Recovery/Amortization Period at		Carrying Amount At
			31-Mar-15		31-Mar-15		31-Dec-14
	Regulatory assets:
	Generation-related regulatory assets securitized		1 year		$	115	$	148
	by transition bonds (a)(e)
	Employee retirement costs		5 years			51		55
	Employee retirement costs to be reviewed (b)(c)		To be determined			257		246
	Employee retirement liability (a)(c)(d)		To be determined			846		865
	Self-insurance reserve (primarily storm recovery		5 years			119		127
	costs) ― net
	Self-insurance reserve to be reviewed ― net (b)(c)		To be determined			264		242
	Securities reacquisition costs		2 years			21		23
	(pre-industry restructure)
	Securities reacquisition costs		Terms of related debt			8		7
	(post-industry restructure) ― net
	Recoverable amounts in lieu of deferred		Life of related asset or liability			13		14
	income taxes ― net
	Deferred conventional meter and metering		Largely 6 years			117		123
	facilities depreciation
	Deferred AMS costs		To be determined			127		113
	Energy efficiency performance bonus (a)		1 year			17		22
	Under-recovered wholesale transmission		1 year			19		26
	service expense ― net (a)
	Other regulatory assets		Various			11		12
	Total regulatory assets					1,985		2,023
	Regulatory liabilities:
	Estimated net removal costs		Life of utility plant			568		531
	Investment tax credit and protected excess		Various			16		18
	deferred taxes
	Over-collection of transition bond revenues (a)(e)		1 year			31		32
	Energy efficiency programs (a)		Not applicable			21		13
	Total regulatory liabilities					636		594
	Net regulatory asset				$	1,349	$	1,429
	____________
		(a)		Not earning a return in the regulatory rate-setting process.
		(b)		Costs incurred since the period covered under the last rate review.
		(c)		Recovery is specifically authorized by statute or by the PUCT, subject to reasonableness review.
		(d)		Represents unfunded liabilities recorded in accordance with pension and OPEB accounting standards.
		(e)		Bondco net regulatory assets of $78 million at March 31, 2015 consisted of $109 million included in generation-related regulatory assets net of the regulatory liability for over-collection of transition bond revenues of $31 million.  Bondco net regulatory assets of $108 million at December 31, 2014 consisted of $140 million included in generation-related regulatory assets net of the regulatory liability for over-collection of transition bond revenues of $32 million.

LongTerm_Debt_Tables

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Borrowings Under Credit Facilities And Long-Term Debt [Abstract]
Schedule Of Long-Term Debt
		March 31,		December 31,
		2015		2014
	Oncor (a):
	6.375% Fixed Senior Notes due January 15, 2015	$	-	$	500
	5.000% Fixed Senior Notes due September 30, 2017		324		324
	6.800% Fixed Senior Notes due September 1, 2018		550		550
	2.150% Fixed Senior Notes due June 1, 2019		250		250
	5.750% Fixed Senior Notes due September 30, 2020		126		126
	4.100% Fixed Senior Notes due June 1, 2022		400		400
	7.000% Fixed Debentures due September 1, 2022		800		800
	2.950% Fixed Senior Notes due April 1, 2025		350		-
	7.000% Fixed Senior Notes due May 1, 2032		500		500
	7.250% Fixed Senior Notes due January 15, 2033		350		350
	7.500% Fixed Senior Notes due September 1, 2038		300		300
	5.250% Fixed Senior Notes due September 30, 2040		475		475
	4.550% Fixed Senior Notes due December 1, 2041		400		400
	5.300% Fixed Senior Notes due June 1, 2042		500		500
	3.750% Fixed Senior Notes due April 1, 2045		375		-
	Unamortized discount		-21		-19
	Less amount due currently		-		-500
	Long-term debt, less amounts due currently — Oncor		5,679		4,956
	Bondco (b):
	5.420% Fixed Series 2003 Bonds due in semiannual installments through August 15, 2015		24		54
	5.290% Fixed Series 2004 Bonds due in semiannual installments through May 15, 2016		126		126
	Less amount due currently		-109		-139
	Long-term debt, less amounts due currently — Bondco		41		41
	Total long-term debt, less amounts due currently	$	5,720	$	4,997
	__________
	(a)   Secured by first priority lien on certain transmission and distribution assets equally and ratably with all of Oncor’s other secured indebtedness.  See “Deed of Trust” below for additional information.
	(b)   The transition bonds are nonrecourse to Oncor and were issued to securitize a regulatory asset.

Membership_Interests_Tables

Membership Interests (Tables)	3 Months Ended
	Mar. 31, 2015
Membership Interests [Abstract]
Schedule Of Changes To Membership Interests
		Capital Accounts			Accumulated Other Comprehensive Income (Loss)			Total Membership Interests
	Balance at December 31, 2014	$	7,625		$	-107		$	7,518
	Net income		98			-			98
	Distributions		-100			-			-100
	Net effects of cash flow hedges (net of tax)		-			1			1
	Balance at March 31, 2015	$	7,623		$	-106		$	7,517
		Capital Accounts			Accumulated Other Comprehensive Income (Loss)			Total Membership Interests
	Balance at December 31, 2013	$	7,457		$	-48		$	7,409
	Net income		104			-			104
	Distributions		-53			-			-53
	Balance at March 31, 2014	$	7,508		$	-48		$	7,460
Schedule Of Changes To Accumulated Other Comprehensive Income (Loss)
		Cash Flow Hedges – Interest Rate Swap				Defined Benefit Pension and OPEB Plans			Accumulated Other Comprehensive Income (Loss)
	Balance at December 31, 2014	$		-24		$	-83		$	-107
	Defined benefit pension plans (net of tax)			-			-			-
	Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges			1			-			1
	Balance at March 31, 2015	$		-23		$	-83		$	-106

Pension_and_Other_Postretireme1

Pension and Other Postretirement Employee Benefits (OPEB) Plans (Tables)	3 Months Ended
	Mar. 31, 2015
Pension And Other Postretirement Employee Benefits (OPEB) Plans [Abstract]
Schedule Of Pension And OPEB Plan Costs
		Three Months Ended March 31,
		2015		2014
	Components of net allocated pension costs:
	Service cost	$	6	$	6
	Interest cost		33		33
	Expected return on assets		-29		-34
	Amortization of net loss		16		10
	Net pension costs		26		15
	Components of net OPEB costs:
	Service cost		2		2
	Interest cost		11		11
	Expected return on assets		-3		-3
	Amortization of prior service cost		-5		-5
	Amortization of net loss		8		6
	Net OPEB costs		13		11
	Total net pension and OPEB costs		39		26
	Less amounts deferred principally as property or a regulatory asset		-28		-17
	Net amounts recognized as expense	$	11	$	9

RelatedParty_Transactions_Tabl

Related-Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2015
Related-Party Transactions [Abstract]
Schedule OF Trade Accounts And Other Receivables From Related Parties
			At March 31,			At December 31,
			2015			2014
	Trade accounts and other receivables from affiliates		$		131	$		123
	Trade accounts and other payables to affiliates				-3			-5
	Trade accounts and other receivables from affiliates – net		$		128	$		118
Schedule Of Related Party Transactions
	Amounts payable to (receivable from) members related to income taxes under the tax sharing agreement and reported on our balance sheet consisted of the following:
		At March 31, 2015							At December 31, 2014
		EFH Corp.		Texas Transmission		Total			EFH Corp.		Texas Transmission		Total
	Federal income taxes receivable	$	-79	$	-20	$	-99		$	-144	$	-36	$	-180
	Texas margin taxes payable		31		-		31			24		-		24
	Net payable (receivable)	$	-48	$	-20	$	-68		$	-120	$	-36	$	-156

Supplementary_Financial_Inform1

Supplementary Financial Information (Tables)	3 Months Ended
	Mar. 31, 2015
Supplementary Financial Information [Abstract]
Schedule Of Other Income And Deductions
			Three Months Ended March 31,
			2015			2014
	Other income:
	Accretion of fair value adjustment (discount) to regulatory assets due to purchase accounting		$	2		$	3
	Other			-			1
	Total other income		$	2		$	4
	Other deductions:
	Professional fees		$	2		$	3
	Other			2			-
	Total other deductions		$	4		$	3
Schedule Of Interest Expense And Related Charges
			Three Months Ended March 31,
			2015			2014
	Interest expense		$	81		$	89
	Amortization of debt issuance costs and discounts			1			1
	Allowance for funds used during construction – capitalized interest portion			-1			-2
	Total interest expense and related charges		$	81		$	88
Schedule Of Trade Accounts Receivable
			At March 31,			At December 31,
			2015			2014
	Gross trade accounts and other receivables		$	548		$	528
	Trade accounts and other receivables from affiliates			-128			-118
	Allowance for uncollectible accounts			-3			-3
	Trade accounts receivable from nonaffiliates – net		$	417		$	407
Summary of Investment Balance
			At March 31,			At December 31,
			2015			2014
	Assets related to employee benefit plans, including employee savings		$	94		$	94
	programs
	Land			3			3
	Total investments and other property		$	97		$	97
Schedule Of Property, Plant And Equipment
			At March 31,			At December 31,
			2015			2014
	Total assets in service		$	18,412		$	18,238
	Less accumulated depreciation			6,231			6,125
	Net of accumulated depreciation			12,181			12,113
	Construction work in progress			430			335
	Held for future use			15			15
	Property, plant and equipment – net		$	12,626		$	12,463
Schedule Of Intangible Assets
		At March 31, 2015								At December 31, 2014
		Gross								Gross
		Carrying			Accumulated					Carrying		Accumulated
		Amount			Amortization			Net		Amount		Amortization		Net
	Identifiable intangible assets subject to amortization included in property, plant and equipment:
	Land easements	$	464		$	87		$	377	$	463	$	86	$	377
	Capitalized software		445			256			189		433		242		191
	Total	$	909		$	343		$	566	$	896	$	328	$	568
Schedule Of Estimated Aggregate Amortization Expenses
	Year					Amortization Expense
	2015					$	64
	2016						61
	2017						52
	2018						47
	2019						44
Schedule Of Other Noncurrent Liabilities And Deferred Credits
			At March 31,			At December 31,
			2015			2014
	Retirement plans and other employee benefits		$	1,906		$	1,894
	Uncertain tax positions (including accrued interest)			2			2
	Amount payable related to income taxes			17			17
	Investment tax credits			17			17
	Other			65			59
	Total other noncurrent liabilities and deferred credits		$	2,007		$	1,989
Schedule Of Supplemental Cash Flow Information
			Three Months Ended March 31,
			2015			2014
	Cash payments (receipts) related to:
	Interest		$	118		$	119
	Capitalized interest			-1			-2
	Interest (net of amounts capitalized)		$	117		$	117
	Noncash construction expenditures (a)		$	60		$	35
	_____________
		(a)		Represents end-of-period accruals.

Recovered_Sheet2

Description Of Business And Significant Accounting Policies (Details) (USD $)	1 Months Ended	3 Months Ended
	Nov. 30, 2008	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2002
		entity
Description of Business [Line Items]
Number of entities that would possibly be bankrupt		1
Principal amount of transition bonds issued				$1,300,000,000
Percentage of equity interest sold in the event of bankruptcy	19.75%
Scenario, Forecast [Member]
Description of Business [Line Items]
Expected decrease to other noncurrent assets and long-term debt		-40,000,000
Sales [Member] | TCEH [Member]
Description of Business [Line Items]
Concentration Risk Percentage		25.00%	26.00%
Oncor
Description of Business [Line Items]
Percentage of membership interest owned by company		80.03%
Texas Transmission [Member]
Description of Business [Line Items]
Percentage of membership interest owned by non-controlling owners		19.75%

EFH_Bankruptcy_Proceedings_Nar

EFH Bankruptcy Proceedings (Narrative) (Details) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2015
EFH Bankruptcy Proceedings [Abstract]
Amount receivable from related party		$129
Amount collected from related party	$127

Regulatory_Matters_Details

Regulatory Matters (Details) (USD $)	Feb. 19, 2015
In Millions, unless otherwise specified
Regulatory Matters [Abstract]
Estimated impact on earnings, minimum	$0
Estimated impact on earnings, maximum	$130

Recovered_Sheet3

Regulatory Assets And Liabilities (Components Of Regulatory Assets And Liabilities) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Regulatory Assets And Liabilities [Line Items]
Carrying Amount, Regulatory Assets	$1,985	$2,023
Carrying Amount, Regulatory Liabilities	636	594
Net regulatory asset	1,349	1,429
Bondco
Regulatory Assets And Liabilities [Line Items]
Net regulatory asset	78	108
Estimated Net Removal Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Life of utility plant
Carrying Amount, Regulatory Liabilities	568	531
Investment Tax Credit and Protected Excess Deferred Taxes [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Various
Carrying Amount, Regulatory Liabilities	16	18
Over Collection of Transition Bond Revenues [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	1 year
Carrying Amount, Regulatory Liabilities	31	32
Net regulatory asset	31	32
Energy Efficiency Programs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Not applicable
Carrying Amount, Regulatory Liabilities	21	13
Generation Related Regulatory Assets Securitized by Transition Bonds [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	1 year
Carrying Amount, Regulatory Assets	115	148
Net regulatory asset	109	140
Employee Retirement Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	5 years
Carrying Amount, Regulatory Assets	51	55
Employee Retirement Costs to be Reviewed [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	257	246
Employee Retirement Liability [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	846	865
Self Insurance Reserve (Primarily Storm Recovery Costs) - Net [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	5 years
Carrying Amount, Regulatory Assets	119	127
Self Insurance Reserve to be Reviewed [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	264	242
Securities Reacquisition Costs (Pre-Industry Restructure) [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	2 years
Carrying Amount, Regulatory Assets	21	23
Securities Reacquisition Costs (Post Industry Restructure) - Net [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Terms of related debt
Carrying Amount, Regulatory Assets	8	7
Recoverable Amounts In Lieu Of Deferred Income Taxes - Net [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Life of related asset or liability
Carrying Amount, Regulatory Assets	13	14
Deferred Conventional Meter And Metering Facilities Depreciation [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Largely 6 years
Carrying Amount, Regulatory Assets	117	123
Deferred AMS Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	To be determined
Carrying Amount, Regulatory Assets	127	113
Energy Efficiency Performance Bonus [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	1 year
Carrying Amount, Regulatory Assets	17	22
Under Recovered Wholesale Transmission Service Expense - Net [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	1 year
Carrying Amount, Regulatory Assets	19	26
Other Regulatory Assets [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	Various
Carrying Amount, Regulatory Assets	$11	$12

Borrowings_Under_Credit_Facili1

Borrowings Under Credit Facilities (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
	item
Line of Credit Facility [Line Items]
Secured revolving credit facility	$2,400,000,000
Number of revolving credit facilities extension options	2
Extension period for revolving line of credit	1 year
Additional increase in borrowing capacity amount	100,000,000
Outstanding borrowing under the revolving credit facility	800,000,000	711,000,000
Outstanding borrowing, interest rate	1.30%	1.29%
Letters of credit	7,000,000	7,000,000
Commitment fee	0.13%
Borrowing capacity available under the credit facility	1,593,000,000	1,682,000,000
Available bond credits	$2,618,000,000
Maximum [Member]
Line of Credit Facility [Line Items]
Commitment rate reduction under the revolving credit facility	0.28%
Required debt-to-capitalization ratio	1
Minimum [Member]
Line of Credit Facility [Line Items]
Commitment rate reduction under the revolving credit facility	0.10%
Required debt-to-capitalization ratio	0.65
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Outstanding borrowing, interest rate	1.33%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Spread over variable rate	1.13%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Spread over variable rate	1.75%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Spread over variable rate	1.00%
Federal Funds Effective Rate [Member]
Line of Credit Facility [Line Items]
Spread over variable rate	0.50%
One Month LIBOR [Member]
Line of Credit Facility [Line Items]
Spread over variable rate	1.00%
One Month LIBOR [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Spread over variable rate	0.75%
One Month LIBOR [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Spread over variable rate	0.00%

LongTerm_Debt_Narrative_Detail

Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2014	Dec. 31, 2014	Jan. 15, 2015
Debt Instrument [Line Items]
Repayments of long-term debt	$530,000,000	$28,000,000
Note redemption price to principal amount, percentage	100.00%
Proceeds from issuance of long-term debt	725,000,000
Percentage of principal amount plus accrued and unpaid interest and make-whole premium	100.00%
Increase in basis points	0.50%
Percentage of fair value of cost of property additions certified to the Deed of Trust collateral agent	85.00%
Estimated fair value of our long-term debt including current maturities	7,084,000,000			6,844,000,000
Carrying amount	5,829,000,000			5,636,000,000
Available bond credits	2,618,000,000
Future debt subject to property additions to the Deed of Trust	900,000,000
6.375% Fixed Senior Notes Due January 15, 2015 [Member]
Debt Instrument [Line Items]
Aggregate principal amount				500,000,000	500,000,000
Interest percentage	6.38%				6.38%
Transition Bond [Member]
Debt Instrument [Line Items]
Debt principal amount	30,000,000
2.950% Fixed Senior Notes due April 1, 2025 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	350,000,000
Interest percentage	2.95%
2.150% Fixed Senior Notes Due June 1, 2019 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	250,000,000			250,000,000
Interest percentage	2.15%
Proceeds from issuance of long-term debt			714,000,000
4.550% Fixed Senior Notes Due December 1, 2041 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	400,000,000			400,000,000
Interest percentage	4.55%
3.750% Fixed Senior Notes due April 1, 2045 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$375,000,000
Interest percentage	3.75%

LongTerm_Debt_Schedule_Of_Long

Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)	Mar. 31, 2015	Jan. 15, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Debt Instrument [Line Items]
Total long-term debt, less amounts due currently	5,720		$4,997
6.375% Fixed Senior Notes Due January 15, 2015 [Member]
Debt Instrument [Line Items]
Fixed Senior Note		500	500
Interest percentage	6.38%	6.38%
5.000% Fixed Senior Notes Due September 30, 2017 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	324		324
Interest percentage	5.00%
6.800% Fixed Senior Notes Due September 1, 2018 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	550		550
Interest percentage	6.80%
2.150% Fixed Senior Notes Due June 1, 2019 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	250		250
Interest percentage	2.15%
5.750% Fixed Senior Notes Due September 30, 2020 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	126		126
Interest percentage	5.75%
4.100% Fixed Senior Notes Due June 1, 2022 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	400		400
Interest percentage	4.10%
7.000% Fixed Debentures Due September 1, 2022 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	800		800
Interest percentage	7.00%
2.950% Fixed Senior Notes due April 1, 2025 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	350
Interest percentage	2.95%
7.000% Fixed Senior Notes Due May 1, 2032 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	500		500
Interest percentage	7.00%
7.250% Fixed Senior Notes Due January 15, 2033 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	350		350
Interest percentage	7.25%
7.500% Fixed Senior Notes Due September 1, 2038 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	300		300
Interest percentage	7.50%
5.250% Fixed Senior Notes Due September 30, 2040 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	475		475
Interest percentage	5.25%
4.550% Fixed Senior Notes Due December 1, 2041 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	400		400
Interest percentage	4.55%
5.300% Fixed Senior Notes Due June 1, 2042 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	500		500
Interest percentage	5.30%
3.750% Fixed Senior Notes due April 1, 2045 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	375
Interest percentage	3.75%
5.420% Fixed Series 2003 Bonds Due Through August 15, 2015 [Member]
Debt Instrument [Line Items]
Fixed Bonds	24		54
Interest percentage	5.42%
5.290% Fixed Series 2004 Bonds Due Through May 15, 2016 [Member]
Debt Instrument [Line Items]
Fixed Bonds	126		126
Interest percentage	5.29%
Oncor
Debt Instrument [Line Items]
Unamortized discount	-21		-19
Less amount due currently			-500
Total long-term debt, less amounts due currently	5,679		4,956
Bondco
Debt Instrument [Line Items]
Less amount due currently	-109		-139
Total long-term debt, less amounts due currently	41		$41

Membership_Interests_Narrative

Membership Interests (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended		0 Months Ended
In Millions, unless otherwise specified	Feb. 28, 2015	Mar. 31, 2015	Mar. 31, 2014	Apr. 29, 2015
Subsequent Event [Line Items]
Declaration of cash distribution to members	$100	$100	$53
Assumed debt to equity ratio, debt		60.00%
Assumed debt to equity ratio, equity		40.00%
Regulatory capitalization ratio, debt		59.80%
Regulatory capitalization ratio, equity		40.20%
Cash available for distribution under the capital structure restriction		37
Subsequent Event [Member]
Subsequent Event [Line Items]
Declaration of cash distribution to members				$65

Membership_Interests_Schedule_

Membership Interests (Schedule Of Changes To Membership Interests) (Details) (USD $)	1 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Feb. 28, 2015	Mar. 31, 2015	Mar. 31, 2014
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance		$7,518	$7,409
Net income		98	104
Distributions	-100	-100	-53
Net effects of cash flow hedges (net of tax)		1
Balance		7,517	7,460
Capital Accounts [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance		7,625	7,457
Net income		98	104
Distributions		-100	-53
Net effects of cash flow hedges (net of tax)
Balance		7,623	7,508
Accumulated Other Comprehensive Income (Loss) [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Balance		-107	-48
Net income
Distributions
Net effects of cash flow hedges (net of tax)		1
Balance		($106)	($48)

Membership_Interests_Schedule_1

Membership Interests (Schedule Of Changes To Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period		($107)
Balance at end of period	-106	-107
Cash Flow Hedges - Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	-24
Defined benefit pension plans (net of tax)
Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges	1
Balance at end of period	-23
Defined Benefit Pension and OPEB Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	-83
Defined benefit pension plans (net of tax)
Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges
Balance at end of period	-83
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	-107
Defined benefit pension plans (net of tax)
Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges	1
Balance at end of period	($106)

Recovered_Sheet4

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Oncor Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.95%
Expected return on plan assets	5.25%
EFH Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.19%
Expected return on plan assets	5.38%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash contributions	1
Additional cash contributions	44
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.23%
Expected return on plan assets	6.65%
Cash contributions	8
Additional cash contributions	17

Recovered_Sheet5

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Recognized Net Periodic Pension And Benefit Costs) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Net costs	$39	$26
Less amounts deferred principally as property or a regulatory asset	-28	-17
Net amounts recognized as expense	11	9
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	6
Interest cost	33	33
Expected return on assets	-29	-34
Amortization of net loss	16	10
Net costs	26	15
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2
Interest cost	11	11
Expected return on assets	-3	-3
Amortization of prior service cost	-5	-5
Amortization of net loss	8	6
Net costs	$13	$11

RelatedParty_Transactions_Narr

Related-Party Transactions (Narrative) (Details) (USD $)	3 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014	Dec. 31, 2014
Related Party Transaction [Line Items]
Revenue from related party	$236	$241
Amounts receivable from affiliates	128			118
Unbilled Receivables related to affiliate	42			52
Income tax payments made to or received from members	0	0
TCEH [Member]
Related Party Transaction [Line Items]
Revenue from related party	1	1
Delivery fee surcharges	4	4
Letter of credit	9			9
EFH Corp [Member]
Related Party Transaction [Line Items]
Administrative and services costs	5	8
Shared facilities expense	1	1
Reimbursement payment amount			1
Maximum [Member] | EFH Corp [Member]
Related Party Transaction [Line Items]
Shared facilities payments received	$1	$1

RelatedParty_Transactions_Sche

Related-Party Transactions (Schedule Of Accounts Receivable From Related Party) (Details) (EFH Corp [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
EFH Corp [Member]
Related Party Transaction [Line Items]
Trade accounts and other receivables from affiliates	$131	$123
Trade accounts and other payables to affiliates	-3	-5
Trade accounts and other receivables from affiliates - net	$128	$118

RelatedParty_Transactions_Amou

Related-Party Transactions (Amounts Payable To (Receivable From) Members In Lieu Of Income Taxes) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Related Party Transaction [Line Items]
Federal income taxes receivable	($99)	($180)
Texas margin taxes payable	31	24
Net payable (receivable)	-68	-156
EFH Corp [Member]
Related Party Transaction [Line Items]
Federal income taxes receivable	-79	-144
Texas margin taxes payable	31	24
Net payable (receivable)	-48	-120
Texas Transmission and Investment LLC [Member]
Related Party Transaction [Line Items]
Federal income taxes receivable	-20	-36
Net payable (receivable)	($20)	($36)

Supplementary_Financial_Inform2

Supplementary Financial Information (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Supplemental Financial Information [Line Items]
Unbilled revenue	$152		182
Aggregate amortization expenses	16	14
Goodwill	$4,064		4,064
Sales [Member] | TCEH [Member]
Supplemental Financial Information [Line Items]
Concentration Risk Percentage	25.00%	26.00%
Sales [Member] | Nonaffiliated REP [Member]
Supplemental Financial Information [Line Items]
Concentration Risk Percentage	17.00%	15.00%
Nonaffiliated Trade Accounts Receivable [Member] | Nonaffiliated REP [Member]
Supplemental Financial Information [Line Items]
Concentration Risk Percentage	14.00%		12.00%

Supplementary_Financial_Inform3

Supplementary Financial Information (Schedule Of Other Income And Deductions) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Supplementary Financial Information [Abstract]
Accretion of fair value adjustment (discount) to regulatory assets due to purchase accounting	$2	$3
Other		1
Total other income	2	4
Professional fees	2	3
Other	2
Total other deductions	$4	$3

Supplementary_Financial_Inform4

Supplementary Financial Information (Schedule Of Interest Expense And Related Charges) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Supplementary Financial Information [Abstract]
Interest expense	$81	$89
Amortization of debt issuance costs and discounts	1	1
Allowance for funds used during construction - capitalized interest portion	-1	-2
Total interest expense and related charges	$81	$88

Supplementary_Financial_Inform5

Supplementary Financial Information (Schedule Of Trade Accounts Receivable) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Supplementary Financial Information [Abstract]
Gross trade accounts and other receivables	$548	$528
Trade accounts and other receivables from affiliates	-128	-118
Allowance for uncollectible accounts	-3	-3
Trade accounts receivable from nonaffiliates - net	$417	$407

Supplementary_Financial_Inform6

Supplementary Financial Information (Summary of Investment Balance) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Supplementary Financial Information [Abstract]
Assets related to employee benefit plans, including employee savings programs	$94	$94
Land	3	3
Total investments and other property	$97	$97

Supplementary_Financial_Inform7

Supplementary Financial Information (Schedule Of Property, Plant And Equipment) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Supplementary Financial Information [Abstract]
Total assets in service	$18,412	$18,238
Less accumulated depreciation	6,231	6,125
Net of accumulated depreciation	12,181	12,113
Construction work in progress	430	335
Held for future use	15	15
Property, plant and equipment - net	$12,626	$12,463

Supplementary_Financial_Inform8

Supplementary Financial Information (Schedule Of Intangible Assets) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$909	$896
Accumulated Amortization	343	328
Net	566	568
Land Easements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	464	463
Accumulated Amortization	87	86
Net	377	377
Capitalized Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	445	433
Accumulated Amortization	256	242
Net	$189	$191

Supplementary_Financial_Inform9

Supplementary Financial Information (Schedule Of Estimated Aggregate Amortization Expenses) (Details) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Supplementary Financial Information [Abstract]
2015	$64
2016	61
2017	52
2018	47
2019	$44

Recovered_Sheet6

Supplementary Financial Information (Schedule Of Other Noncurrent Liabilities And Deferred Credits) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Supplementary Financial Information [Abstract]
Retirement plans and other employee benefits	$1,906	$1,894
Uncertain tax positions (including accrued interest)	2	2
Amounts payable related to income taxes	17	17
Investment tax credits	17	17
Other	65	59
Total other noncurrent liabilities and deferred credits	$2,007	$1,989

Recovered_Sheet7

Supplementary Financial Information (Schedule Of Supplemental Cash Flow Information) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Supplementary Financial Information [Abstract]
Interest	$118		$119
Capitalized interest	-1		-2
Interest	117		117
Noncash construction expenditures	$60	[1]	$35	[1]
[1]	Represents end-of-period accruals.