Oncor Electric Delivery 10-K 26 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 25, 2016
Entity Registrant Name	ONCOR ELECTRIC DELIVERY CO LLC
Entity Central Index Key	1,193,311
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Amendment Flag	false
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	0
Entity Current Reporting Status	No
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Public Float	$ 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 Investment LLC [Member]
Entity Outstanding Membership Interests		19.75%

Statements of Consolidated Inco

Statements of Consolidated Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating revenues:
Nonaffiliates	$ 2,923	$ 2,851	$ 2,585
Affiliates	955	971	967
Total operating revenues	3,878	3,822	3,552
Operating expenses:
Wholesale transmission service	802	755	588
Operation and maintenance (Note12)	724	698	681
Depreciation and amortization	863	851	814
Provision in lieu of income taxes (Notes 1, 4 and 12)	260	280	247
Taxes other than amounts related to income taxes	450	438	424
Total operating expenses	3,099	3,022	2,754
Operating income	779	800	798
Other income and deductions:
Other income (Note 13)	6	13	18
Other deductions (Note 13)	28	15	15
Nonoperating provision in lieu of income taxes (Note 4)	(8)	(2)	2
Interest income		3	4
Interest expense and related charges (Note 13)	333	353	371
Net income	$ 432	$ 450	$ 432

Statements of Consolidated Comp

Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Statements Of Consolidated Comprehensive Income [Abstract]
Net income	$ 432	$ 450	$ 432
Other comprehensive income (loss):
Cash flow hedges – derivative value net loss recognized in net income (net of tax expense of $1, $1 and $1) (Note 1)	2	2	2
Defined benefit pension plans (net of tax benefit of $4, $33 and $11) (Note 10)	(8)	(61)	(19)
Total other comprehensive income (loss)	(6)	(59)	(17)
Comprehensive income	$ 426	$ 391	$ 415

Statements Of Consolidated Com4

Statements Of Consolidated Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Statements Of Consolidated Comprehensive Income [Abstract]
Cash flow hedges - derivative value net loss recognized in net income, tax benefit	$ 1	$ 1	$ 1
Defined benefit pension plans- net tax benefit	$ 4	$ 33	$ 11

Statements Of Consolidated Cash

Statements Of Consolidated Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows - operating activities:
Net income	$ 432	$ 450	$ 432
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	908	892	848
Provision in lieu of deferred income taxes - net	40	148	194
Other - net	(4)	(3)	(4)
Changes in operating assets and liabilities:
Accounts receivable - trade (including affiliates)	12	8	(129)
Inventories	(8)	(9)	9
Accounts payable - trade (including affiliates)	(21)	15	38
Regulatory accounts related to reconcilable tariffs (Note 5)	11	(44)	(53)
Other - assets	22	(233)	172
Other - liabilities	(31)	52	(137)
Cash provided by operating activities	1,361	1,276	1,370
Cash flows - financing activities:
Issuances of long-term debt (Note 7)	725	250	100
Repayments of long-term debt (Note 7)	(639)	(131)	(125)
Net (decrease) increase in short-term borrowings (Note 6)	129	(34)	10
Distributions to members (Note 9)	(436)	(282)	(310)
Debt discount, premium, financing and reacquisition costs - net	(12)	(5)	1
Cash used in financing activities	(233)	(202)	(324)
Cash flows - investing activities:
Capital expenditures (Note12)	(1,154)	(1,107)	(1,079)
Other - net	47	10	15
Cash used in investing activities	(1,107)	(1,097)	(1,064)
Net change in cash and cash equivalents	21	(23)	(18)
Cash and cash equivalents - beginning balance	4	27	45
Cash and cash equivalents - ending balance	$ 25	$ 4	$ 27

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents		$ 25	$ 4
Restricted cash — Bondco (Note 13)		38	56
Trade accounts receivable from nonaffiliates – net (Note 13)		388	407
Trade accounts and other receivables from affiliates – net (Note 12)		118	118
Amounts receivable from members related to income taxes (Note 12)		136	180
Materials and supplies inventories - at average cost		82	73
Prepayments and other current assets		89	88
Total current assets		876	926
Restricted cash — Bondco (Note 13)			16
Investments and other property (Note 13)		97	97
Property, plant and equipment – net (Note 13)		13,024	12,463
Goodwill (Notes 1 and 13)		4,064	4,064
Other noncurrent assets		32	34
Total assets		19,287	19,029
Current liabilities:
Short-term borrowings (Note 6)		840	711
Trade accounts payable (Note 12)		150	202
Amounts payable to members related to income taxes (Note 12)		20	24
Accrued taxes other than amounts related to income		181	174
Accrued interest		82	93
Other current liabilities		144	156
Total current liabilities		1,458	1,999
Long-term debt, less amounts due currently (Note 7)		5,646	4,964
Liability in lieu of deferred income taxes (Notes 1, 4 and 12)		2,612	2,559
Employee benefit obligations and other (Notes 12 and 13)		2,063	1,989
Total liabilities		$ 11,779	$ 11,511
Commitments and contingencies (Note 8)
Membership interests (Note 9):
Capital account — number of interests outstanding 2015 and 2014 - 635,000,000		$ 7,621	$ 7,625
Accumulated other comprehensive loss		(113)	(107)
Total membership interests		7,508	7,518
Total liabilities and membership interests		19,287	19,029
Oncor [Member]
Current assets:
Regulatory assets - net (Note 5)		1,184	1,321
Current liabilities:
Long-term debt due currently (Note 7)	[1]		500
Long-term debt, less amounts due currently (Note 7)	[1]	5,646	4,924
Bondco [Member]
Current assets:
Regulatory assets - net (Note 5)		10	108
Current liabilities:
Long-term debt due currently (Note 7)	[2]	$ 41	139
Long-term debt, less amounts due currently (Note 7)	[2]		$ 40
[1]	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.
[2]	The transition bonds are nonrecourse to Oncor and were issued to securitize a regulatory asset.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - shares	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Consolidated Balance Sheets [Abstract]
Capital account, interests outstanding	635,000,000	635,000,000	635,000,000

Statements Of Consolidated Memb

Statements Of Consolidated Membership Interests $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Capital account:
Balance at beginning of period	$ 7,625	$ 7,457	$ 7,335
Net income	432	450	432
Distributions to members	(436)	(282)	(310)
Balance at end of period (number of interests outstanding: 2015, 2014, and 2013 - 635 million)	7,621	7,625	7,457
Accumulated other comprehensive income (loss) net of tax effects:
Balance at beginning of period	(107)	(48)	(31)
Net effects of cash flow hedges (net of tax expense of $1, $1 and $1)	2	2	2
Defined benefit pension plans (net of tax benefit of $4, $33 and $11) (Note 10)	(8)	(61)	(19)
Balance at end of period	(113)	(107)	(48)
Total membership interests at end of period	$ 7,508	$ 7,518	$ 7,409

Statements Of Consolidated Mem9

Statements Of Consolidated Membership Interests (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statements Of Consolidated Membership Interest [Abstract]
Interests outstanding	635,000,000	635,000,000	635,000,000
Net effects of cash flow hedges, tax expense	$ 1	$ 1	$ 1
Defined benefit pension plans- net tax benefit	$ 4	$ 33	$ 11

Description Of Business and Sig

Description Of Business and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Description Of Business and Significant Accounting Policies [Abstract]
DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES	1. DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES Description of Business References in this report to “we,” “our,” “us” and “the company” are to Oncor and/or its 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% , 25 % and 27 % of our total operating revenues for the years ended December 31, 201 5 , 201 4 and 201 3 , 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 VIE (see Note 13) . This financing subsidiary was organized for the limited purpose of issuing certain transition bonds to recover generation-related regulatory asset stranded costs and other qualified costs under an order issued by the PUCT in 2002. Bondco issued an aggregate $ 1.3 billion principal amount of transition bonds during 2003 and 2004. The 2003 Series transition bonds matured in 2015 and were paid in full. The 2004 Series transition bonds , with an outstanding balance of $41 million at December 31, 2015 , mature in May 2016 . Final true-up proceedings for the 2004 Bonds are expected to be conducted by the PUCT during 2016 and are expected to have minimal or zero net income impact. 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 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 consolidated financial statements have been prepared in accordance with US GAAP . All dollar amounts in the financial statements and tables in the notes are stated in millions of US dollars unless otherwise indicated. Consolidation of Variable Interest Entities A VIE is an entity with which we have a relationship or arrangement that indicates some level of control over the entity or results in economic risks to us. We consolidate a VIE if we have: a) the power to direct the significant activities of the VIE and b) the right or obligation to absorb profit and loss from the VIE (primary beneficiary). See Note 13. Income Taxes Effective with the November 2008 sale of equity interests to Texas Transmission and Investment LLC, we became a partnership for US federal income tax purposes, and subsequently we are not a member of EFH Corp.’s consolidated tax group and only EFH Corp.’s share of our partnership income is included in its consolidated federal income tax return. Our tax sharing agreement with Oncor Holdings and EFH Corp. was amended in November 2008 to include Texas Transmission and Investment LLC. The tax sharing agreement provides for the calculation of tax liability substantially as if we and Oncor Holdings were taxed as corporations, and requires tax payments to members determined on that basis (without duplication for any income taxes paid by a subsidiary of Oncor Holdings). While partnerships are not subject to income taxes, in consideration of the tax sharing agreement and the presentation of our financial statements as an entity subject to cost-based regulatory rate-setting processes, with such costs including income taxes, the financial statements present amounts determined under the tax sharing agreement as “provision in lieu of income taxes” and “liability in lieu of deferred income taxes” for periods subsequent to the sales of equity interests discussed in Note 4. Such amounts are determined in accordance with the provisions of accounting guidance for income taxes and for uncertainty in income taxes and thus differences between the book and tax bases of assets and liabilities are accounted for as if we were taxed as a corporation. The accounting guidance for rate-regulated enterprises requires the recognition of regulatory assets or liabilities if it is probable such deferred tax amounts will be recovered from, or returned to customers in future rates. Investment tax credits are amortized to income over the estimated lives of the related properties. We classify interest and penalties expense related to uncertain tax positions as current provision in lieu of income taxes as discussed in Note 4. Use of Estimates Preparation of our financial statements requires management to make estimates and assumptions about future events that affect the reporting of assets and liabilities at the balance sheet dates and the reported amounts of revenue and expense, including fair value measurements. In the event estimates and/or assumptions prove to be different from actual amounts, adjustments are made in subsequent periods to reflect more current information. No material adjustments were made to previous estimates or assumptions during the current year. 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. Revenue Recognition R evenue includes an estimate for electricity delivery services provided from the billed meter reading date to the end of the period (unbilled revenue). For electricity delivery services billed on the basis of kWh volumes, unbilled revenue is based on data collected through our AMS. For other electricity delivery services, unbilled revenue is based on average daily revenues for the most recent period applied to the number of unmetered days through the end of the period. Impairment of Long-Lived Assets and Goodwill We evaluate long-lived assets (including intangible assets with finite lives) for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. We also evaluate goodwill for impairment annually (at December 1) and whenever events or changes in circumstances indicate that an impairment may exist. The determination of the existence of these and other indications of impairment involves judgments that are subjective in nature and may require the use of estimates in forecasting future results and cash flows. If at the assessment date our carrying value exceeds our estimated fair value (enterprise value), then the estimated enterprise value is compared to the estimated fair values of our operating assets (including identifiable intangible assets) and liabilities at the assessment date. The resultant implied goodwill amount is compared to the recorded goodwill amount. Any excess of the recorded goodwill amount over the implied goodwill amount is written off as an impairment charge. The goodwill impairment test s performed in 2015 and 201 4 w ere based on a qualitative assessment in which we considered macroeconomic conditions, industry and market considerations, cost factors, overall financial performance and other relative factors. The g oodwill impairment test performed in 201 3 was based on determinations of enterprise value using discounted cash flow analyses, comparable company equity values and any relevant transactions indicative of enterprise values (quantitative assessment). Based on tests results, no impairments were recognized in 201 5 , 201 4 or 201 3 . System of Accounts Our accounting records have been maintained in accordance with the FERC Uniform System of Accounts as adopted by the PUCT. Defined Benefit Pension Plans and OPEB Plans We have liabilities under pension plans that offer benefits based on either a traditional defined benefit formula or a cash balance formula and an OPEB plan that offers certain health care and life insurance benefits to eligible employees and their eligible dependents upon the retirement of such employees from the company. Costs of pension and OPEB plans are dependent upon numerous factors, assumptions and estimates. See Note 10 for additional information regarding pension and OPEB plans. 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. Fair Value of Nonderivative Financial Instruments The carrying amounts for financial assets classified as current assets and the carrying amounts for financial liabilities classified as current liabilities approximate fair value due to the short maturity of such instruments. The fair values of other financial instruments, for which carrying amounts and fair values have not been presented, are not materially different than their related carrying amounts. The following discussion of fair value accounting standards applies primarily to our determination of the fair value of assets in the pension and OPEB plans trusts (see Note 10) and long-term debt (see Note 7). Accounting standards related to the determination of fair value define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. We use a “mid-market” valuation convention (the mid-point price between bid and ask prices) as a practical expedient to measure fair value for the majority of our assets and liabilities subject to fair value measurement on a recurring basis. We primarily use the market approach for recurring fair value measurements and use valuation techniques to maximize the use of observable inputs and minimize the use of unobservable inputs. We categorize our assets and liabilities recorded at fair value based upon the following fair value hierarchy: · Level 1 valuations use quoted prices in active markets for identical assets or liabilities that are accessible at the measurement date. An active market is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis. · Level 2 valuations use inputs that, in the absence of actively quoted market prices, are observable for the asset or liability, either directly or indirectly. Level 2 inputs include: (a) quoted prices for similar assets or liabilities in active markets, (b) quoted prices for identical or similar assets or liabilities in markets that are not active, (c) inputs other than quoted prices that are observable for the asset or liability such as interest rates and yield curves observable at commonly quoted intervals and (d) inputs that are derived principally from or corroborated by observable market data by correlation or other means. Our Level 2 valuations utilize over-the-counter broker quotes, quoted prices for similar assets or liabilities that are corroborated by correlations or other mathematical means and other valuation inputs. · Level 3 valuations use unobservable inputs for the asset or liability. Unobservable inputs are used to the extent observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date. We use the most meaningful information available from the market combined with internally developed valuation methodologies to develop our best estimate of fair value. We utilize several different valuation techniques to measure the fair value of assets and liabilities, relying primarily on the market approach of using prices and other market information for identical and/or comparable assets and liabilities for those items that are measured on a recurring basis. Franchise Taxes Franchise taxes are assessed to us by local governmental bodies, based on kWh delivered and are the principal component of taxes other than amounts related to income taxes as reported in the income statement. Franchise taxes are not a “pass through” item. The rates we charge customers are intended to recover the franchise taxes, but we are not acting as an agent to collect the taxes from customers. Cash and Cash Equivalents For purposes of reporting cash and cash equivalents, temporary cash investments purchased with a remaining maturity of three months or less are considered to be cash equivalents. See Note 13 for details regarding restricted cash. Property, Plant and Equipment Properties are stated at original cost. The cost of self-constructed property additions includes materials and both direct and indirect labor and applicable overhead and an allowance for funds used during construction. D epreciation of property, plant and equipment is calculated on a straight-line basis over the estimated service lives of the properties based on depreciation rates approved by the PUCT. As is common in the industry, depreciation expense is recorded using composite depreciation rates that reflect blended estimates of the lives of major asset groups as compared to depreciation expense calculated on a component asset-by-asset basis. Depreciation rates include plant removal costs as a component of depreciation expense, consistent with regulatory treatment. Actual removal costs incurred are charged to accumulated depreciation. When accrued removal costs exceed incurred removal costs, the difference is reclassified as a regulatory obligation to retire assets in the future. Allowance for Funds Used During Construction (AFUDC) AFUDC is a regulatory cost accounting procedure whereby both interest charges on borrowed funds and a return on equity capital used to finance construction are included in the recorded cost of utility plant and equipment being constructed. AFUDC is capitalized on all projects involving construction periods lasting greater than thirty days. The equity portion , if any, of capitalized AFUDC is accounted for as other income . See Note 13 for detail of amounts charged to interest expense. Regulatory Assets and Liabilities Our financial statements reflect regulatory assets and liabilities under cost-based rate regulation in accordance with accounting standards related to the effect of certain types of regulation. Regulatory decisions can have an impact on the recovery of costs, the rate earned on invested capital and the timing and amount of assets to be recovered by rates. See Note 5 for details of regulatory assets and liabilities. Changes in Accounting Standards In April 2015, the Financial Accounting Standards Board issued Accounting Standards Update No. 2015-03 (ASU 2015-03), Simplifying the Presentation of Debt Issuance Costs . The update requires that debt issuance costs be presented as a direct reduction to the face value of the related debt liability rather than as an asset, consistent with the presentation of debt discounts. We adopted ASU 2015-03 as of December 31, 2015, and applied its provisions retrospectively. The adoption resulted in the reclassification of $36 million and $34 million of unamortized debt issuance costs from other non-current assets to long-term debt within the consolidated balance sheets as of December 31, 2015 and December 31, 2014, respectively. Other than this reclassification, the adoption of ASU 2015-03 did not have an impact on our reported results of operations, financial condition or cash flows. In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update No. 2014-09 (ASU 2014-09), Revenue from Contracts with Customers . ASU 2014-09 introduces new, increased requirements for disclosure of revenue in financial statements and is intended to eliminate inconsistencies in revenue recognition and thereby improve financial reporting comparability across entities, industries and capital markets. ASU 2014-09 is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 201 7 for public entities. Early application is permitted only as of annual reporting periods beginning after December 31, 2016, including interim reporting periods within that reporting period. We are currently evaluating the potential impact of ASU 2014-09. The adoption of ASU 2014-09 is not expected to have a material effect on our reported results of operations, financial condition or cash flows.

EFH Bankruptcy Proceedings

EFH Bankruptcy Proceedings	12 Months Ended
	Dec. 31, 2015
EFH Bankruptcy Proceedings [Abstract]
EFH BANKRUPTCY PROCEEDINGS	2. E FH 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 1 and below for further information regarding the EFH Bankruptcy Proceedings and the proposed change in control of Oncor’s indirect majority owner in connection with such 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. A provision for uncollectible accounts from affiliates has not been established as of December 31, 2015. Potential Change in Indirect Ownership of Oncor As part of the EFH Bankruptcy Proceedings, on September 21, 2015, the EFH Debtors filed their fifth amended plan of reorganization (as such may be amended from time to time, Plan of Reorganization) and related amended disclosure statement (the Disclosure Statement). Also on September 21, 2015, the bankruptcy court approved the Disclosure Statement and the EFH Debtors’ related Plan of Reorganization solicitation procedures. The EFH Debtors solicited votes on the Plan of Reorganization and received significant support in favor of confirmation. The EFH Debtors filed their sixth amended Plan of Reorganization on December 6, 2015 to address and resolve several issues raised by parties in interest and the bankruptcy court. The bankruptcy court confirmed the EFH Debtors' sixth amended Plan of Reorganization by order dated December 9, 2015. The EFH Debtors presently are seeking regulatory approvals for the transactions contemplated by the Plan of Reorganization , which approvals are conditions to the Plan of Reorganization e ffective d ate. We cannot predict the outcome of these regulatory proceedings and whether the Plan of Reorganization will become effective. In general, the Plan of Reorganization calls for a merger and investment structure that involves a tax-free deconsolidation of TCEH from EFH Corp., immediately followed by the acquisition of reorganized EFH Corp. financed by existing TCEH creditors and third party investors. In this regard, the Plan of Reorganization provides for a series of transactions that would lead to a significant change in the indirect equity ownership of Oncor. Under the terms of the Plan of Reorganization, on the effective date, acquisition entities (Purchasers) controlled by an investor group (collectively, the Investor Group) consisting of certain unsecured creditors of TCEH and an affiliate of Hunt Consolidated, Inc. (Hunt), as well as certain other investors designated by Hunt to acquire (EFH Acquisition) reorganized EFH Corp. (Reorganized EFH), would acquire pursuant to a merger and purchase agreement direct or indirect equity interests in Reorganized EFH and EFIH that indirectly represent all of the outstanding equity interests in Oncor Holdings and at least 80.03% of the outstanding equity interests in Oncor. As part of the transactions contemplated by the merger and purchase agreement, among other things, the Investor Group intends to raise up to $12.6 billion of equity and debt financing to invest in Reorganized EFH, and a successor to Reorganized EFH will be converted to a real estate investment trust (REIT) under the Internal Revenue Code. In addition, and in connection with the merger and purchase agreement referred to above, at the request of and with the consent of EFIH, we and Oncor Holdings entered into a letter agreement with the Purchasers. The letter agreement sets forth certain rights and obligations of the Oncor entities and the Purchasers to cooperate in the manner set forth therein with respect to initial steps to be taken in connection with the EFH Acquisition and the other transactions described in the merger and purchase agreement. The letter agreement is not intended to give the Purchasers, directly or indirectly, the right to control or direct the operations of any Oncor entity prior to the receipt of all approvals required by the PUCT and other governmental entities and the consummation of the EFH Acquisition and related transactions (if and when such transactions are consummated). In addition, Oncor Holdings and Oncor have not endorsed or approved any restructuring involving Oncor Holdings or Oncor or any other transaction proposed by the Purchasers involving Oncor Holdings or Oncor, and the parties acknowledge that further action will be required by Oncor Holdings and Oncor in order for any such restructuring or other transaction to be completed. In connection with the proposed EFH Acquisition, EFH Corp. has taken the position that, unless the Purchasers have otherwise acquired, or entered into a definitive agreement with Texas Transmission for the acquisition of the equity interest in Oncor held by Texas Transmission at the consummation of the EFH Acquisition, certain of EFH Corp.’s rights contained in the Investor Rights Agreement (Investor Rights Agreement), dated November 2008 among Oncor and certain of its direct and indirect equity holders, including EFH Corp. and Texas Transmission, would require Texas Transmission to sell its equity interest in Oncor to the Purchasers in connection with the EFH Acquisition. In this regard, in October 2015, EFH Corp. filed a complaint against Texas Transmission alleging breach of Texas Transmission’s obligations under the Investor Rights Agreement for failing to agree to sell its equity interest in Oncor in connection with the proposed EFH Acquisition. The Purchasers have intervened in the pending litigation. The parties are in the process of conducting discovery and engaging in other pretrial matters. We cannot predict the outcome of this pending litigation between EFH Corp. and Texas Transmission relating to the Investor Rights Agreement and the impact of such litigation on the EFH Acquisition and related transactions. As a general matter, although the Plan of Reorganization has been confirmed by the Bankruptcy Court, we cannot predict the ultimate outcome of the EFH Bankruptcy Proceedings, including whether the transactions contemplated by the Plan of Reorganization will (or when they will) close. In addition, the transactions are subject to customary closing conditions, including receipt of all applicable regulatory approvals. In this regard in September 2015, Oncor and the Purchasers filed a joint application with the PUCT seeking certain regulatory approvals with respect to the transactions contemplated by the Plan of Reorganization, and a ruling with respect to such application is expected by late March 201 6 . Regulatory approvals with respect to those transactions were the subject of a n application filed by Oncor and the Purchasers with FERC. FERC issued an order conditionally approving the transactions on December 4, 2015. As indicated above, PUCT a pprova l remain s pending, and there can be no assurance if or when the required regulatory approval will be obtained or if the conditions to any such approval will be acceptable to the Purchasers. In addition, in connection with the EFH Bankruptcy Proceedings, the EFH Debtors and various creditor parties entered into a settlement agreement (the Settlement Agreement) in August 2015 (as amended in September 2015) to compromise and settle, among other things (a) intercompany claims among the EFH Debtors, (b) claims and causes of actions against holders of first lien claims against TCEH and the agents under the TCEH Senior Secured Facilities, (c) claims and causes of action against holders of interests in EFH Corp. and certain related entities and (d) claims and causes of action against each of the EFH Debtors' current and former directors, the Sponsor Group, managers and officers and other related entities. The Settlement Agreement contemplates a release of such claims upon approval of the Settlement Agreement by the Bankruptcy Court, which would remain in effect whether or not the EFH Acquisition is completed or the Plan of Reorganization becomes effective. The Bankruptcy Court approved the Settlement Agreement in December 2015. The Settlement Agreement settles substantially all inter-debtor claims through the effective date of the Settlement Agreement. These settled claims include potentially contentious inter-debtor claims, including various potential avoidance actions and claims arising under numerous debt agreements, tax sharing agreements, and contested property transfers. The release provisions of the Settlement Agreement took effect immediately upon the entry of the Bankruptcy Court order approving the Settlement Agreement and are not contingent upon either the Plan of Reorganization becoming effective or the closing of the EFH Acquisition. Accordingly, substantially all of the potential affiliate claims, derivative claims and other types of disputes among affiliates (including claims against Oncor) have been resolved by bankruptcy court order. Accordingly, we believe the Settlement Agreement resolves all affiliate claims against Oncor and its assets existing as of the effective date of the Settlement Agreement. The EFH Bankruptcy Proceedings continue to be a complex litigation matter and the full extent of potential impacts on Oncor remains unknown. We will continue to evaluate our affiliate transactions and contingencies throughout the EFH Bankruptcy Proceedings to determine any risks and resulting impacts on our results of operations, financial statements and cash flows. See Note 12 for details of our related-party transactions with members of the Texas Holdings Group.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2015
Regulatory Matters [Abstract]
REGULATORY MATTERS	3. REGULATORY MATTERS Change in Control Review In connection with the EFH Acquisition contemplated by the Plan of Reorganization filed in the EFH Bankruptcy Proceedings, in September 2015, Oncor and the Purchasers in the proposed EFH Acquisition filed a joint report and application for regulatory approvals pursuant to PURA. For additional information regarding the EFH Acquisition and application for regulatory approval, see Note 2 to Financial Statements. 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 in February 2015. The Texas Supreme Court requested full briefing on the merits, and the briefing period end ed on January 25 , 201 6 . On February 19, 2016, the Texas Supreme Court granted the petition for review, with the date and time of oral arguments to be set at a later date. There is no deadline for the court to act. 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 an approximate $135 million loss (after tax) including interest. Interest accrues at the PUCT approved rate for over-collections which is 0.18% for 2016. 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. We are involved in various other regulatory 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.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Taxes [Abstract]
INCOME TAXES	4. INCOME TAXES The components of our reported provision (benefit) in lieu of income taxes are as follows: Year Ended December 31, 2015 2014 2013 Reported in operating expenses: Current: US federal $ 189 $ 113 $ 51 State 32 24 12 Deferred: US federal 55 146 181 State (13) - 6 Amortization of investment tax credits (3) (3) (3) Total reported in operating expenses 260 280 247 Reported in other income and deductions: Current: US federal (7) (4) (5) State - - - Deferred federal (1) 2 7 Total reported in other income and deductions (8) (2) 2 Total provision in lieu of income taxes $ 252 $ 278 $ 249 Reconciliation of provision in lieu of income taxes computed at the US federal statutory rate to provision in lieu of income taxes: Year Ended December 31, 2015 2014 2013 Income before provision in lieu of income taxes $ 684 $ 728 $ 681 Provision in lieu of income taxes at the US federal statutory rate of 35% $ 239 $ 255 $ 238 Amortization of investment tax credits – net of deferred tax effect (3) (3) (3) Amortization (under regulatory accounting) of statutory tax rate changes (1) (2) (2) Amortization of Medicare subsidy regulatory asset - 14 14 Texas margin tax, net of federal tax benefit 13 16 15 Nondeductible losses (gains) on benefit plan investments - (2) (3) Other, including audit settlements 4 - (10) Reported provision in lieu of income taxes $ 252 $ 278 $ 249 Effective rate 36.8% 38.2% 36.6% The net amounts of $ 2. 612 billion and $2. 559 billion reported in the balance sheets at December 31, 201 5 and 201 4 , respectively, as liability in lieu of deferred income taxes include amounts previously recorded as net deferred tax liabilities. Upon the sale of equity interests to Texas Transmission and Investment LLC in 2008, we became a partnership for US federal income tax purposes, and the temporary differences that gave rise to the deferred taxes will, over time, become taxable to the equity holders. Under a tax sharing agreement among us and our equity holders (see Note 1), we make payments to the equity holders related to income taxes when amounts would have become due to the IRS if Oncor was taxed as a corporation . Accordingly, as the temporary differences become taxable, we will pay the equity holders. In the unlikely event such amounts are not paid under the tax sharing agreement, it is probable that this regulatory liability will continue to be included in Oncor’s rate setting processes . Accounting For Uncertainty in Income Taxes Prior to November 2008, we were a member of the EFH Corp. consolidated tax group. The examination and applicable appeals process of EFH Corp. and its subsidiaries’ federal income tax returns for the years ending prior to January 1, 2009 are complete, but final settlement of those years is not expected until EFH Corp. finalizes any claims with the IRS for those years in the bankruptcy process. Texas franchise and margin tax returns are under examination or still open for examination for tax years beginning after 2006. Subsequent to November 2008, we are not a member of the EFH Corp. consolidated federal tax group and assess our liability for uncertain tax positions in our partnership returns. In the first quarter of 2014, several uncertain tax positions were remeasured under US GAAP guidance as a result of new information received from the IRS with respect to the audit of tax years 2007 through 2009. As a result, we reduced the liability for uncertain tax positions by $ 18 million. This reduction consisted of a $16 million increase in liability in lieu of deferred income taxes and a $2 million ($ 1 million after tax) reversal of accrued interest, which is reported as a decrease in provision in lieu of income taxes. In September 2014, EFH Corp. signed the final agreed Revenue Agent Report and associated documentation (RAR) for the 2007 tax year and filed and received approval of the bankruptcy court in the EFH Bankruptcy Proceedings of its signing of the RAR. With the signing of the RAR in the third quarter of 2014, the remaining $1 million liability for uncertain tax positions with respect to tax year 2007 was released. The reduction consisted of a $1 million reversal of provision in lieu of income taxes. Final processing of the agreed RAR continues. The impact related to the conclusion of the 200 7 audit is a deferred tax asset of approximately $45 million that is recorded in liability in lieu of deferred income taxes . In the fourth quarter of 2014, the Department of Justice filed a claim with the bankruptcy court for open tax years through 2013 that was consistent with the settlement EFH Corp. reached with the IRS for tax years 2003 through 2006. As a result of this filing, the 2003 through 2006 open tax years for GAAP purposes were settled and the liability for uncertain tax positions was reduced by $35 million. The impact related to the conclusion of the 2003 through 2006 audit is approximately $11 million and is recorded as a deferred tax asset in liability in lieu of deferred income taxes. In the second quarter of 2015, EFH Corp. received the final RAR and associated documentation for the 2008 tax year which includes the results of Oncor. In addition, we received the final RAR and associated documentation for tax years 2008 and 2009 in which we filed a partnership tax return. The RARs reflect additional deductions for Oncor resulting in approximately $8 million in tax refunds from our members. Of this amount, $4 million is related to pre-partnership formation and is recorded as a deferred tax asset in liability in lieu of deferred income taxes and $4 million is related to post-partnership formation and was collected during the third quarter of 2015. The following table summarizes the changes to the uncertain tax positions reported in other noncurrent liabilities in our consolidated balance sheet during the years ended December 31, 2015, 2014 and 2013: 2015 2014 2013 Balance at January 1, excluding interest and penalties $ 2 $ 54 $ 144 Additions based on tax positions related to prior years - - - Reductions based on tax positions related to prior years - (16) (66) Settlements with taxing authorities 1 (36) (24) Balance at December 31, excluding interest and penalties $ 3 $ 2 $ 54 Of the balances at both December 31, 2015 and 201 4 , $3 million represent s tax positions for which the uncertainty relates to the timing of recognition for tax purposes. The disallowance of such positions would not affect the effective tax rate, but would accelerate the payment of cash under the tax sharing agreement to an earlier period. Noncurrent liabilities included no accrued interest related to uncertain tax positions at December 31, 2015 and 2014. There were no amounts recorded related to interest and penalties in the year ended December 31, 2015 and benefits of $1 million and $15 million for the years ended December 31, 2014 and 2013, respectively (all amounts after tax). The federal income tax benefit on the interest accrued on uncertain tax positions is recorded as liability in lieu of deferred income taxes.

Regulatory Assets and Liabiliti

Regulatory Assets and Liabilities	12 Months Ended
	Dec. 31, 2015
Regulatory Assets and Liabilities [Abstract]
REGULATORY ASSETS AND LIABILITIES	5. 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 our 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 December 31, 2015 December 31, 2015 December 31, 2014 Regulatory assets: Generation-related regulatory assets securitized by transition bonds (a)(e) < 1 year $ 31 $ 148 Employee retirement costs 4 years 38 55 Employee retirement costs to be reviewed (b)(c) To be determined 291 246 Employee retirement liability (a)(c)(d) To be determined 853 865 Self-insurance reserve (primarily storm recovery costs) ― net 4 years 95 127 Self-insurance reserve to be reviewed ― net (b)(c) To be determined 332 242 Securities reacquisition costs (pre-industry restructure) 1 year 14 23 Securities reacquisition costs (post-industry restructure) ― net Lives of related debt 9 7 Recoverable amounts in lieu of deferred income taxes ― net Life of related asset or liability 12 14 Deferred conventional meter and metering facilities depreciation Largely 5 years 100 123 Deferred AMS costs To be determined 164 113 Energy efficiency performance bonus (a) 1 year 10 22 Under-recovered wholesale transmission service expense ― net (a) - 26 Other regulatory assets Various 9 12 Total regulatory assets 1,958 2,023 Regulatory liabilities: Estimated net removal costs Lives of related assets 686 531 Investment tax credit and protected excess deferred taxes Various 14 18 Over-collection of transition bond revenues (a)(e) 1 year 29 32 Over-recovered wholesale transmission service expense ― net (a) 1 year 24 - Energy efficiency programs (a) Not applicable 11 13 Total regulatory liabilities 764 594 Net regulatory asset $ 1,194 $ 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 $ 10 million at December 31, 2015 consisted of $ 31 million included in generation-related regulatory assets net of the regulatory liability for over-collection of transition bond revenues of $ 21 million (excludes $8 million of over-collections related to Series 2003-1 transition bonds assumed by Oncor for final settlement). 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. In August 2011, the PUCT issued a final order in our rate review filed in January 2011. The rate review included a determination of the recoverability of regulatory assets at June 30, 2010, including the recoverability period of those assets deemed allowable by the PUCT. In accordance with the PUCT’s August 2009 order in our rate review, the remaining net book value and the approved amount of removal cost of existing conventional meters that were replaced by advanced meters are being charged to depreciation and amortization expense over an 11-year cost recovery period. In September 2008, the PUCT approved a settlement for us to recover our estimated future investment for advanced metering deployment. We began billing the AMS surcharge in the January 2009 billing month cycle. The surcharge is expected to total $1.023 billion over the 11 -year recovery period and includes a cost recovery factor of $2.19 per month per residential retail customer and $2.39 to $5.15 per month for non-residential retail customers. We account for the difference between the surcharge billings for advanced metering facilities and the allowable revenues under the surcharge provisions, which are based on expenditures and an allowed return, as a regulatory asset or liability. Such differences arise principally as a result of timing of expenditures or cost increases . As indicated in the table above, the regulatory asset at December 31, 2015 and 2014 totaled $ 164 million and $113 million, respectively. As a result of purchase accounting, in 2007 the carrying value of certain generation-related regulatory assets securitized by transition bonds, which have been reviewed and approved by the PUCT for recovery but without earning a rate of return, was reduced by $213 million. This amount is being accreted to other income over the recovery period that was remaining at October 10, 2007 (approximately nine years) which ends in 2016 . See Note 12 for information regarding nuclear decommissioning cost recovery.

Borrowings Under Credit Facilit

Borrowings Under Credit Facilities	12 Months Ended
	Dec. 31, 2015
Borrowings Under Credit Facilities [Abstract]
BORROWINGS UNDER CREDIT FACILITIES	6. BORROWINGS UNDER CREDIT FACILITIES At December 31, 201 5 , we had a 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. In October 2015, we exercised one of the two one -year extensions available to us and extended the term of the revolving credit facility to October 2017 . Also in October 2015, we exercised our option to permanently reduce the loan commitment available under the revolving credit facility from $2.4 billion to $2.0 billion. The terms of the revolving credit facility allow us to request an increase in our borrowing capacity of $100 million in the aggregate and/or a one-year extension, 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 December 31, 201 5 , we had outstanding borrowings under the revolving credit facility totaling $840 million with an interest rate of 1.48% 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 December 31, 201 5 , all outstanding borrowings bore interest at LIBOR plus 1.125% . Amounts borrowed under the 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 December 31, 201 5 , 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 facility, each based on our current credit ratings. Under the terms of our revolving credit facility, the commitments of the lenders to make loans to us are several and not joint. Accordingly, if any lender fails to make loans to us, our available liquidity could be reduced by an amount up to the aggregate amount of such lender’s commitments under the facility. Subject to the limitations described below, borrowing capacity available under the credit facility at December 31, 201 5 and 201 4 was $1.153 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 7 , 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 December 31, 201 5 , 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 December 31, 201 5 , we were in compliance with this covenant with a debt-to-capitalization ratio of 0.46 to 1.00 and with all other covenants .

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2015
Long-Term Debt [Abstract]
LONG-TERM DEBT	7. LONG-TERM DEBT At December 31, 201 5 and 201 4 , our long-term debt consisted of the following: 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 and debt issuance costs (54) (51) Less amount due currently - (500) Long-term debt, less amounts due currently — Oncor 5,646 4,924 Bondco (b): 5.420% Fixed Series 2003 Bonds due in semiannual installments through August 15, 2015 - 54 5.290% Fixed Series 2004 Bonds due in semiannual installments through May 15, 2016 41 126 Debt issuance costs - (1) Total 41 179 Less amount due currently (41) (139) Long-term debt, less amounts due currently — Bondco - 40 Total long-term debt, less amounts due currently $ 5,646 $ 4,964 __________ (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 201 5 Debt Repayments Rep ayments of long-term debt in 2015 totaled $639 million consisting of $500 million aggregate principal amount of 6.375% senior secured notes paid at the scheduled maturity date of January 15, 2015 and $139 million of 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. In October 2015 we completed an offering with the holders of the Notes to exchange their respective Notes for notes that have terms identical in all material respects to the Notes (Exchange Notes), except that the Exchange Notes do not contain terms with respect to transfer restrictions, registration rights and payment of additional interest for failure to observe certain obligations in a certain registration rights agreement. The Exchange Notes were registered on a Form S-4, which was declared effective in September 2015. Debt-Related Activity in 2014 Debt Repayments Rep ayments of long-term debt in 2014 totaled $131 million and represent transition bond principal payments at scheduled maturity dates. Issuance of New Senior Secured Notes In May 2014 , we issued $250 million aggregate principal amount of 2.150% senior secured notes maturing in June 2019 (2019 Notes). We used the proceeds (net of the initial purchasers’ discount, fees and expenses) of approximately $248 million from the sale of the 2019 Notes to repay borrowings under our revolving credit facility and for other general corporate purposes. The 2019 Notes are secured by a first priority lien , and are secured equally and ratably with all of our other secured indebtedness. Interest on the 2019 Notes is payable in cash semiannually in arrears on June 1 and December 1 of each year, beginning on December 1, 2014. We may at our option redeem the 2019 Notes, in whole or in part, at any time, at a price equal to 100% of their principal amount, plus accrued and unpaid interest and , until May 1, 2019, a make-whole premium. The 2019 Notes also contain customary events of default, including failure to pay principal or interest on the 2019 Notes when due. The 2019 Notes were issued in a private placement . I n December 2014 we completed an offering with the holders of the 2019 Notes to exchange their respective 2019 Notes for notes that have terms identical in all material respects to the Notes (2019 Exchange Notes), except that the 2019 Exchange Notes do not contain terms with respect to transfer restrictions, registration rights and payment of additional interest for failure to observe certain obligations in a certain registration rights agreement. The 2019 Exchange Notes were registered on a Form S-4, which was declared effective in November 2014. Deed of Trust Our secured indebtedness, including the revolving credit facility described in Note 6, 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 December 31, 201 5 , the amount of available bond credits was approximately $2.577 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 $1.261 billion. Maturities Long-term debt maturities at December 31, 201 5 , are as follows: Year Amount 2016 $ 41 2017 324 2018 550 2019 250 2020 126 Thereafter 4,450 Unamortized discount and debt issuance costs (54) Total $ 5,687 Fair Value of Long-Term Debt At December 31, 201 5 and 201 4 , the estimated fair value of our long-term debt (including current maturities) totaled $6.2 87 billion and $6.844 billion, respectively, and the carrying amount totaled $5.687 billion and $5.603 billion, respectively. The fair value is estimated using observable market data , representing Level 2 valuations under accounting standards related to the determination of fair value.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies [Abstract]
COMMITMENTS AND CONTINGENCIES	8 . 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. T he Oncor Ring-Fenced Entities are not parties to the EFH Bankruptcy Proceedings. See Notes 2 and 12 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. Leases At December 31, 201 5 , our future minimum lease payments under operating leases (with initial or remaining noncancelable lease terms in excess of one year) were as follows: Year Amount 2016 $ 9 2017 1 2018 1 2019 1 2020 - Thereafter - Total future minimum lease payments $ 12 Rent charged to operation and maintenance expense totaled $8 million, $9 million and $ 10 million for the years ended December 31, 201 5 , 201 4 and 201 3 , respectively. Efficiency Spending We are required to annually invest in programs designed to improve customer electricity demand efficiencies to satisfy ongoing regulatory requirements. The 201 6 requirement is $61 million. 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 for additional information regarding contingencies. Labor Contracts At December 31, 2015, approximately 19% of our full time employees were represented by a labor union and covered by a collective bargaining agreement with an expiration date of October 25, 201 7 . Environmental Contingencies We must comply with environmental laws and regulations applicable to the handling and disposal of hazardous waste. We are in compliance with all current laws and regulations; however, the impact, if any, of changes to existing regulations or the implementation of new regulations is not determinable. The costs to comply with environmental regulations can be significantly affected by the following external events or conditions: · changes to existing state or federal regulation by governmental authorities having jurisdiction over control of toxic substances and hazardous and solid wastes, and other environmental matters, and · the identification of additional sites requiring clean-up or the filing of other complaints in which we may be asserted to be a potential responsible party.

Membership Interests

Membership Interests	12 Months Ended
	Dec. 31, 2015
Membership Interests [Abstract]
MEMBERSHIP INTERESTS	9 . 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 December 31, 201 5 , $30 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 February 2 4 , 201 6 , our board of directors declared a cash distribution of $ 56 million, which was p aid to our members on February 2 5 , 201 6 . During 2015, our board of directors declared, and we paid, the following cash distributions to our members: Declaration Date Payment Date Amount December 9, 2015 December 11, 2015 $ 18 October 27, 2015 November 9, 2015 $ 135 July 29, 2015 August 10, 2015 $ 118 April 29, 2015 May 15, 2015 $ 65 February 25, 2015 February 26, 2015 $ 100 During 2014, our board of directors declared, and we paid, the following cash distributions to our members: Declaration Date Payment Date Amount October 21, 2014 October 22, 2014 $ 101 July 30, 2014 July 31, 2014 $ 71 April 30, 2014 May 1, 2014 $ 57 February 19, 2014 February 20, 2014 $ 53 Accumulated Other Comprehensive Income (Loss) The following table present s the changes to accumulated other comprehensive income (loss) for the year s ended December 31, 2015 , 2014 and 2013 . 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) - (8) (8) Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges 2 - 2 Balance at December 31, 2015 $ (22) $ (91) $ (113) Balance at December 31, 2013 $ (26) $ (22) $ (48) Defined benefit pension plans (net of tax) - (61) (61) Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges 2 - 2 Balance at December 31, 2014 $ (24) $ (83) $ (107) Balance at December 31, 2012 $ (28) $ (3) $ (31) Defined benefit pension plans (net of tax) - (19) (19) Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges 2 - 2 Balance at December 31, 2013 $ (26) $ (22) $ (48)

Pension and Other Postretiremen

Pension and Other Postretirement Employee Benefits (OPEB) Plans	12 Months Ended
	Dec. 31, 2015
Pension And Other Postretirement Employee Benefits (OPEB) Plans [Abstract]
PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS (OPEB) PLANS	10 . PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS (OPEB) PLANS Regulatory Recovery of Pension and OPEB Costs PURA provides for our recovery of pension and OPEB costs applicable to services of our active and retired employees, as well as services of other EFH Corp. active and retired employees prior to the deregulation and disaggregation of EFH Corp.’s electric utility businesses effective January 1, 2002 (recoverable service). Accordingly, we entered into an agreement with EFH Corp. whereby we assumed responsibility for applicable pension and OPEB costs related to those personnel’s recoverable service. We are authorized to establish a regulatory asset or liability for the difference between the amounts of pension and OPEB costs approved in current billing rates and the actual amounts that would otherwise have been recorded as charges or credits to earnings related to recoverable service. Amounts deferred are ultimately subject to regulatory approval. At December 31, 201 5 and 201 4 , we had recorded regulatory assets totaling $1.182 billion and $ 1.166 b illion, respectively, related to pension and OPEB costs, including amounts related to deferred expenses as well as amounts related to unfunded liabilities that otherwise would be recorded as other comprehensive income. We have also assumed primary responsibility for pension benefits of a closed group of retired and terminated vested plan participants not related to our regulated utility business (non-recoverable service) in a 2012 transaction. Any retirement costs associated with non-recoverable service is not recoverable through rates. Pension Plan s 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. All eligible employees hired after January 1, 2001 participate under the Cash Balance Formula. Certain employees, who, prior to January 1, 2002, participated under the Traditional Retirement Plan Formula, continue their participation under that formula. It is the sponsors’ policy to fund the plans on a current basis to the extent required under existing federal tax and ERISA regulations. We also have the S upplemental Retirement P lan for certain employees whose retirement benefits cannot be fully earned under the qualified retirement plan, the information for which is included below. OPEB Plan Until July 1, 2014, we participated with EFH Corp. and other subsidiaries of EFH Corp. to offer certain health care and life insurance benefits to eligible employees and their eligible dependents upon the retirement of such employees (EFH OPEB Plan). As discussed below, we ceased participation in the EFH OPEB Plan and established our own OPEB plan for our eligible retirees, certain eligible retirees of EFH Corp. for whom we have OPEB liability with respect to their regulated service, and their dependents (Oncor OPEB Plan). For employees retiring on or after January 1, 2002, the retiree contributions required for such coverage vary based on a formula depending on the retiree’s age and years of service. 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 totaling $90 million as of December 31, 201 5 , that amount is not reported on our balance sheet. Pension and OPEB Costs Recognized as Expense P ension and OPEB amounts p rovided herein include amounts related only to our portion of the various plans based on actuarial computations and reflect our employee and retiree demographics as described above. Our net costs related to pension and OPEB plans for the years ended December 31, 2015, 2014 and 2013 were comprised of the following : Year Ended December 31, 2015 2014 2013 Pension costs $ 104 $ 58 $ 95 OPEB costs 53 48 37 Total benefit costs 157 106 132 Less amounts deferred principally as property or a regulatory asset (113) (69) (95) Net amounts recognized as expense $ 44 $ 37 $ 37 We and EFH Corp. use the calculated value method to determine the market-related value of the assets held in the trust for purposes of calculating our pension costs. We and EFH Corp. include the realized and unrealized gains or losses in the market-related value of assets over a rolling four -year period. Each year, 25 % of such gains and losses for the current year and for each of the preceding three years is included in the market-related value. Each year, the market-related value of assets is increased for contributions to the plan and investment income and is decreased for benefit payments and expenses for that year. We and EFH Corp. use the fair value method to determine the market-related value of the assets held in the trust for purposes of calculating OPEB cost. Detailed Information Regarding Pension and OPEB Benefits The following pension and OPEB information is based on December 31, 201 5 , 201 4 and 201 3 measurement dates: Pension Plans OPEB Plan Year Ended December 31, Year Ended December 31, 2015 2014 2013 2015 2014 2013 Assumptions Used to Determine Net Periodic Pension and OPEB Costs: Discount rate (a) 3.96% 4.74% 4.10% 4.23% 4.98% 4.10% Expected return on plan assets 5.26% 6.47% 6.14% 6.65% 7.05% 6.70% Rate of compensation increase 3.29% 3.94% 3.94% - - - Components of Net Pension and OPEB Costs: Service cost $ 25 $ 23 $ 26 $ 7 $ 6 $ 6 Interest cost 131 132 122 43 44 36 Expected return on assets (115) (136) (123) (10) (12) (11) Amortization of prior service cost (credit) - - - (20) (20) (20) Amortization of net loss 63 39 69 33 30 26 Settlement charges - - 1 - - - Net periodic pension and OPEB costs $ 104 $ 58 $ 95 $ 53 $ 48 $ 37 Other Changes in Plan Assets and Benefit Obligations Recognized as Regulatory Assets or in Other Comprehensive Income: Net loss (gain) $ 37 $ 388 $ (139) $ 39 $ 128 $ - Amortization of net loss (63) (39) (69) (33) (30) (26) Amortization of prior service (cost) credit - - - 20 20 20 Settlement charges - - (1) - - - Total recognized as regulatory assets or other comprehensive income (26) 349 (209) 26 118 (6) Total recognized in net periodic pension and OPEB costs and as regulatory assets or other comprehensive income $ 78 $ 407 $ (114) $ 79 $ 166 $ 31 _______________ (a) As a result of the transfer of OPEB plan assets and liabilities from the EFH OPEB Plan to the Oncor OPEB Plan discussed above, the discount rate reflected in OPEB costs for January through June 2014 was 4.98% and for July through December 2014 was 4.39% . Pension Plans OPEB Plan Year Ended December 31, Year Ended December 31, 2015 2014 2013 2015 2014 2013 Assumptions Used to Determine Benefit Obligations at Period End: Discount rate 4.30% 3.96% 4.74% 4.60% 4.23% 4.98% Rate of compensation increase 3.29% 3.29% 3.94% - - - Pension Plans OPEB Plan Year Ended December 31, Year Ended December 31, 2015 2014 2015 2014 Change in Projected Benefit Obligation: Projected benefit obligation at beginning of year $ 3,379 $ 2,857 $ 1,054 $ 924 Service cost 25 23 7 6 Interest cost 131 132 43 44 Participant contributions - - 15 15 Actuarial (gain) loss (181) 515 25 128 Benefits paid (153) (148) (56) (63) Projected benefit obligation at end of year $ 3,201 $ 3,379 $ 1,088 $ 1,054 Accumulated benefit obligation at end of year $ 3,100 $ 3,260 $ - $ - Change in Plan Assets: Fair value of assets at beginning of year $ 2,454 $ 2,271 $ 161 $ 179 Actual return (loss) on assets (103) 263 (4) 12 Employer contributions 54 68 25 18 Participant contributions - - 15 15 Benefits paid (153) (148) (56) (63) Fair value of assets at end of year $ 2,252 $ 2,454 $ 141 $ 161 Funded Status: Projected benefit obligation at end of year $ (3,201) $ (3,379) $ (1,088) $ (1,054) Fair value of assets at end of year 2,252 2,454 141 161 Funded status at end of year $ (949) $ (925) $ (947) $ (893) Pension Plans OPEB Plan Year Ended December 31, Year Ended December 31, 2015 2014 2015 2014 Amounts Recognized in the Balance Sheet Consist of: Liabilities: Other current liabilities $ (4) $ (4) $ - $ - Other noncurrent liabilities (945) (921) (947) (893) Net liability recognized $ (949) $ (925) $ (947) $ (893) Regulatory assets: Net loss $ 583 $ 619 $ 320 $ 316 Prior service cost (credit) - - (50) (70) Net regulatory asset recognized $ 583 $ 619 $ 270 $ 246 Accumulated other comprehensive net loss $ 136 $ 126 $ 4 $ 2 The following tables provide information regarding the assumed health care cost trend rates. Year Ended December 31, 2015 2014 Assumed Health Care Cost Trend Rates – Not Medicare Eligible: Health care cost trend rate assumed for next year 6.00% 8.00% Rate to which the cost trend is expected to decline (the ultimate trend rate) 5.00% 5.00% Year that the rate reaches the ultimate trend rate 2024 2022 Assumed Health Care Cost Trend Rates – Medicare Eligible: Health care cost trend rate assumed for next year 5.80% 6.50% Rate to which the cost trend is expected to decline (the ultimate trend rate) 5.00% 5.00% Year that the rate reaches the ultimate trend rate 2024 2021 1-Percentage Point Increase 1-Percentage Point Decrease Sensitivity Analysis of Assumed Health Care Cost Trend Rates: Effect on accumulated postretirement obligation $ 152 $ (125) Effect on postretirement benefits cost 8 (7) The following table provides information regarding pension plans with projected benefit obligations (PBO) and accumulated benefit obligations (ABO) in excess of the fair value of plan assets. At December 31, 2015 2014 Pension Plan with PBO and ABO in Excess of Plan Assets: Projected benefit obligations $ 3,035 $ 3,379 Accumulated benefit obligations 2,944 3,260 Plan assets 2,085 2,454 Pension and OPEB Plan s Investment Strategy and Asset Allocations Our investment objective for the retirement plans is to invest in a suitable mix of assets to meet the future benefit obligations at an acceptable level of risk, while minimizing the volatility of contributions. Equity securities are held to achieve returns in excess of passive indexes by participating in a wide range of investment opportunities. International equity , real estate securities and credit strategies (high yield bonds, emerging market debt and bank loans) are used to further diversify the equity portfolio . International equity securities may include investments in both developed and emerging international markets. Fixed income securities include primarily corporate bonds from a diversified range of companies, US Treasuries and agency securities and money market instruments. Our investment strategy for fixed income investments is to maintain a high grade portfolio of securities, which assists us in managing the volatility and magnitude of plan contributions and expense while maintaining sufficient cash and short-term investments to pay near-term benefits and expenses. The Oncor Retirement Plan’s investments are managed in two pools: one pool associated with the recoverable service portion of plan obligations related to Oncor’s regulated utility business, and a second pool associated with the non-recoverable service portion of plan obligations not related to Oncor’s regulated utility business. Each pool is invested in a broadly diversified portfolio of equity, fixed income securities, credit strategies and real estate. The second pool represents about 32% of total investments at December 31, 2015. The target asset allocation ranges of the pension plan s investments by asset category are as follows: Target Allocation Ranges Asset Category Recoverable Nonrecoverable US equities 17% - 21% 6% - 10% International equities 14% - 18% 5% - 9% Fixed income 48% - 60% 76% - 84% Real estate 4% - 5% - Credit strategies 6% - 8% 4% - 6% Our investment objective for the OPEB p lan primarily follows the objectives of the pension plans discussed above, while maintaining sufficient cash and short-term investments to pay near-term benefits and expenses. The actual amounts at December 31, 201 5 provided below are consistent with the asset allocation targets. Fair Value Measurement of Pension Plan s Assets At December 31, 201 5 and 201 4 , pension plan s assets measured at fair value on a recurring basis consisted of the following: At December 31, 2015 At December 31, 2014 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Asset Category Interest-bearing cash $ - $ 133 $ - $ 133 $ - $ 120 $ - $ 120 Equity securities: US 201 93 - 294 233 85 - 318 International 255 13 - 268 281 12 - 293 Fixed income securities: Corporate bonds (a) - 1,137 - 1,137 - 1,384 - 1,384 US Treasuries - 189 - 189 - 143 - 143 Other (b) - 145 - 145 - 157 - 157 Real estate - 81 5 86 - 31 8 39 Total assets $ 456 $ 1,791 $ 5 $ 2,252 $ 514 $ 1,932 $ 8 $ 2,454 _____________ (a) Substantially all corporate bonds are rated investment grade by a major ratings agency such as Moody’s. (b) Other consists primarily of municipal bonds, emerging market debt, bank loans and fixed income derivative instruments. There was no significant change in the fair value of Level 3 assets in the periods presented. Fair Value Measurement of OPEB P lan Assets At December 31, 201 5 and 201 4, OPEB p lan assets measured at fair value on a recurring basis consisted of the following: At December 31, 2015 At December 31, 2014 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Asset Category Interest-bearing cash $ 4 $ 2 $ - $ 6 $ 2 $ 3 $ - $ 5 Equity securities: US 39 4 - 43 54 4 - 58 International 25 - - 25 31 - - 31 Fixed income securities: Corporate bonds (a) - 30 - 30 - 31 - 31 US Treasuries - 1 - 1 - 1 - 1 Other (b) 35 1 - 36 34 1 - 35 Total assets $ 103 $ 38 $ - $ 141 $ 121 $ 40 $ - $ 161 _____________ (a) Substantially all corporate bonds are rated investment grade by a major ratings agency such as Moody’s. (b) Other consists primarily of diversified bond mutual funds. Expected Long-Term Rate of Return on Assets Assumption The retirement plans’ strategic asset allocation is determined in conjunction with the plans’ advisors and utilizes a comprehensive Asset-Liability modeling approach to evaluate potential long-term outcomes of various investment strategies. The modeling incorporates long-term rate of return assumptions for each asset class based on historical and future expected asset class returns, current market conditions, rate of inflation, current prospects for economic growth, and taking into account the diversification benefits of investing in multiple asset classes and potential benefits of employing active investment management. Pension Plans OPEB Plan Asset Class Expected Long-Term Rate of Return Asset Class Expected Long-Term Rate of Return International equity securities 7.45% 401(h) accounts 6.93% US equity securities 6.64% Life insurance VEBA 6.16% Real estate 5.70% Union VEBA 6.16% Credit strategies 5.70% Non-union VEBA 2.50% Fixed income securities 4.80% Weighted average 6.30% Weighted average (a) 5.83% _____________ (a) The 2016 expected long-term rate of return for the nonregulated portion of the Oncor Retirement Plan is 4.97% . Significant Concentrations of Risk The plans’ investments are exposed to risks such as interest rate, capital market and credit risks. We and EFH Corp. seek to optimize return on investment consistent with levels of liquidity and investment risk which are prudent and reasonable, given prevailing capital market conditions and other factors specific to participating employers. While we and EFH Corp. recognize the importance of return, investments will be diversified in order to minimize the risk of large losses unless, under the circumstances, it is clearly prudent not to do so. There are also various restrictions and guidelines in place including limitations on types of investments allowed and portfolio weightings for certain investment securities to assist in the mitigation of the risk of large losses. Assumed Discount Rate For the Oncor retirement plans at December 31, 2015, we selected the assumed discount rate using the Aon Hewitt AA-AAA Bond Universe yield curve, which is based on corporate bond yields and at December 31, 2015 consisted of 1,150 corporate bonds with an average rating of AA and AAA using Moody’s, S&P and Fitch ratings. For the Oncor OPEB Plan and the EFH Retirement Plan at December 31, 2015, we and EFH Corp., respectively, selected the assumed discount rate using the Aon Hewitt AA Above Median yield curve, which is based on corporate bond yields and at December 31, 2015 consisted of 434 corporate bonds with an average rating of AA using Moody’s, S&P and Fitch ratings. Amortization in 201 6 In 201 6 , amortization of the net actuarial loss and prior service c redit for the defined benefit pension plans from regulatory assets and other comprehensive income into net periodic benefit cost is expected to be $41 million and a less than $1 million credit , respectively. Amortization of the net actuarial loss and prior service credit for the OPEB plan from regulatory assets into net periodic benefit cost is expected to be $35 million and a $20 million credit, respectively. Pension and OPEB Plan s Cash Contributions Our contributions to the benefit plans were as follows: Year Ended December 31, 2015 2014 2013 Pension plans contributions $ 54 $ 68 $ 9 OPEB plan contributions 25 18 11 Total contributions $ 79 $ 86 $ 20 Our funding for the pension plans and the Oncor OPEB P lan is expected to total $4 million and $30 million, respectively in 201 6 and approximately $441 million and $152 million, respectively, in the 201 6 to 20 20 period. Future Benefit Payments Estimated future benefit payments to beneficiaries are as follows: 2016 2017 2018 2019 2020 2021-25 Pension plans $ 167 $ 171 $ 177 $ 182 $ 188 $ 1,006 OPEB plan $ 49 $ 52 $ 54 $ 57 $ 60 $ 334 Thrift Plan Our employees are eligible to participate in a qualified savings plan, a participant-directed defined contribution plan intended to qualify under Section 401(a) of the Code, and is subject to the provisions of ERISA. Under the p lan, employees may contribute, through pre-tax salary deferrals and/or after-tax applicable payroll deductions, a portion of t heir regular salary or wages as permitted under law. Employer matching contributions are made in an amount equal to 100% of the first 6% of employee contributions for employees who are covered under the Cash Balance Formula of the Oncor Retirement Plan, and 75% of the first 6% of employee contributions for employees who are covered under the Traditional Retirement Plan Formula of the Oncor Retirement Plan. Employer matching contributions are made in cash and may be allocated by participants to any of the plan's investment options. Until January 1, 2015, the thrift plan in which our eligible employees were able to participate was sponsored by EFH Corp. (EFH Thrift Plan). Our contributions to the EFH Thrift Plan totaled $13 million for both years ended December 31, 2014 and 2013. Effective January 1, 2015, the accounts of Oncor participants were transferred from the EFH Thrift Plan to an Oncor-sponsored spin-off of the EFH Thrift Plan (Oncor Thrift Plan). Our contributions to the Oncor Thrift Plan totaled $14 million for the year ended December 31, 201 5. Our matching contributions are the same under the Oncor Thrift Plan as they were under the EFH Thrift Plan at the time of the transfer. Since the Oncor Thrift Plan offers identical benefits to our employees, transfer to the Oncor Thrift Plan is not expected to have an impact on our results of operations, financial condition or cash flows.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2015
Stock-Based Compensation [Abstract]
STOCK-BASED COMPENSATION	11. STOCK-BASED COMPENSATION We currently do not offer stock-based compensation to our employees or directors. In 2008, we established the SARs Plan under which certain of our executive officers and key employees were granted stock appreciation rights payable in cash, or in some circumstances, Oncor membership interests. In February 2009, we established the Oncor Electric Delivery Company LLC Director Stock Appreciation Rights Plan (the Director SARs Plan) under which certain non-employee members of our board of directors and other persons having a relationship with us were granted SARs payable in cash, or in some circumstances, Oncor membership interests. In November 2012, we accepted the early exercise of all outstanding SARs (both vested and unvested ) issued to date pursuant to both SARs Plans. As part of the 2012 early exercise of SARs we began accruing interest on dividends declared with respect to the SARs. Under both SARs plans, dividends that were paid in respect of Oncor membership interests while the SARs were outstanding were credited to the SARs holder’s account as if the SARs were units, payable upon the earliest to occur of death, disability, separation from service, unforeseeable emergency, a change in control, or the occurrence of an event triggering SAR exercisability pursuant to Section 5(c)(ii) of the SARs Plan . As a result, at December 31, 2015 we have recorded a liability of approximately $10 million relating to SARS dividend accruals. For accounting purposes, the liability is discounted based on an employee’s or director’s expected retirement date . We recognized approximately $1 million, $1 million and $2 million in accretion and interest with respect to such dividends in 2015, 2014 and 2013, respectively.

Related-Party Transactions

Related-Party Transactions	12 Months Ended
	Dec. 31, 2015
Related-Party Transactions [Abstract]
RELATED-PARTY TRANSACTIONS	1 2 . RELATED-PARTY TRANSACTIONS The following represent our significant related-party transactions and related matters . 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 $955 million, $971 million and $967 million for the years ended December 31, 2015, 2014 and 2013, respectively. The fees are based on rates regulated by the PUCT that apply to all REPs. Trade accounts and other receivables from EFH Corp. affiliates – net reported on our balance sheet , primarily consisting of trade receivables from TCEH related to these electricity delivery fees , are as follows: At December 31, 2015 2014 Trade accounts and other receivables from affiliates $ 120 $ 123 Trade accounts and other payables to affiliates (2) (5) Trade accounts and other receivables from affiliates – net $ 118 $ 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 $17 million, $32 million and $ 30 million for the years ended December 31, 201 5 , 201 4 and 201 3 , respectively. We also charge each other for shared facilities at cost. Our payments to EFH Corp. subsidiaries for shared facilities totaled $4 million for each of the years ended December 31, 201 5 , 201 4 and 201 3 , respectively. Payments we received from EFH Corp. subsidiaries related to shared facilities, totaled $2 million for each of the years ended December 31, 201 5 , 201 4 and 201 3 . · 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 paid EFH Corp. $1 million in June 2014 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. In April 2014, we entered into a welfare benefit administration agreement with EFH Corp., pursuant to which EFH Corp. continued to provide us with welfare benefit administration services under our new benefit plans from July 1, 2014 until December 31, 2014. These amounts are included in the administrative services payments to EFH Corp. subsidiaries reported above. · 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 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 we account for as income taxes and calculate as if we were filing our own return. See discussion in Note 1 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. In the unlikely event such amounts are not paid under the tax sharing agreement, it is probable that this regulatory liability will continue to be included in Oncor’s rate setting processes . Amounts payable to (receivable from) members related to income taxes under the agreement and reported on our balance sheet consisted of the following: At December 31, 2015 At December 31, 2014 EFH Corp. Texas Transmission Total EFH Corp. Texas Transmission Total Federal income taxes receivable $ (109) $ (27) $ (136) $ (144) $ (36) $ (180) Texas margin taxes payable 20 - 20 24 - 24 Net payable (receivable) $ (89) $ (27) $ (116) $ (120) $ (36) $ (156) Cash payments made to (received from) members related to income taxes consisted of the following: Year Ended December 31, 2015 Year Ended December 31, 2014 Year Ended December 31, 2013 EFH Corp. Texas Transm. Total EFH Corp. Texas Transm. Total EFH Corp. Texas Transm. Total Federal income taxes (a) $ 108 $ 27 $ 135 $ 215 $ 54 $ 269 $ 78 $ 11 $ 89 Texas margin taxes (b) 24 - 24 22 - 22 12 - 12 Total payments (receipts) $ 132 $ 27 $ 159 $ 237 $ 54 $ 291 $ 90 $ 11 $ 101 ______________ (a) Includes $33 million payment made to EFH Corp. in 2013 related to the 1997-2002 IRS appeals settlement. (b) Includes $10 million refund received from EFH Corp. in 2013 related to 1997-2001 amended Texas franchise tax returns. · 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 December 31, 201 5 and 201 4 , TCEH had posted letters of credit in the amount of $6 million and $9 million, respectively 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 $17 million, $17 million and $ 16 million for each of the year s ended December 31, 2015, 2014 and 2013 , respectively . 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. · Related parties 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. Also, as of March 31, 2015, 16.6% of the equity in an existing vendor of the company was acquired by a member of the Sponsor Group . During 2015, 2014 and 2013, this vendor performed transmission and distribution system construction and maintenance services for us. A significant amount of cash payments were made for such services to this vendor totaling $128 million dollars for the period April through December 2015. At December 31, 2015 we had outstanding trade payables to this vendor of $3 million. See Notes 4 , 9 and 10 for information regarding the tax sharing agreement, distributions to members and our participation in EFH Corp. pension and OPEB plans, respectively.

Supplementary Financial Informa

Supplementary Financial Information	12 Months Ended
	Dec. 31, 2015
Supplementary Financial Information [Abstract]
SUPPLEMENTARY FINANCIAL INFORMATION	13 . SUPPLEMENTARY FINANCIAL INFORMATION Variable Interest Entities We are the primary beneficiary and consolidate a wholly-owned VIE, Bondco, which was organized for the limited purpose of issuing specific transition bonds and purchasing and owning transition property acquired from us that is pledged as collateral to secure the bonds. We act as the servicer for this entity to collect transition charges authorized by the PUCT. These funds are remitted to the trustee and used for interest and principal payments on the transition bonds and related costs. The material assets and liabilities of Bondco are presented separately on the face of our Consolidated Balance Sheet because the assets are restricted and can only be used to settle the obligations of Bondco, and Bondco’s creditors do not have recourse to our general credit or assets. Our maximum exposure does not exceed our equity investment in Bondco, which was $14 million and $16 million at December 31, 2015 and 2014, respectively. We did not provide any financial support to Bondco during the years ended December 31, 2015 and 2014. Major Customers Revenues from TCEH represented 25% , 25 % and 27 % of our total operating revenues for the years ended December 31, 201 5 , 201 4 and 201 3 , respectively. Revenues from REP subsidiaries of a nonaffiliated entity, collectively represented 17% , 16% and 15% of total operating revenues for each of the years ended December 31, 201 5, 2014 and 201 3, respectively . No other customer represented 10 % or more of our total operating revenues. Other Income and Deductions Year Ended December 31, 2015 2014 2013 Other income: Accretion of fair value adjustment (discount) to regulatory assets due to purchase accounting $ 5 $ 12 $ 17 Net gain on sale of other properties and investments 1 1 1 Total other income $ 6 $ 13 $ 18 Other deductions: Professional fees $ 19 $ 14 $ 10 Non-recoverable pension (Note 10) and other 9 1 5 Total other deductions $ 28 $ 15 $ 15 Interest Expense and Related Charges Year Ended December 31, 2015 2014 2013 Interest expense $ 335 $ 355 $ 360 Amortization of debt issuance costs and discounts 3 3 21 Allowance for funds used during construction – capitalized interest portion (5) (5) (10) Total interest expense and related charges $ 333 $ 353 $ 371 Restricted Cash Restricted cash amounts reported on our balance sheet consisted of the following: At December 31, 2015 At December 31, 2014 Current Assets Noncurrent Assets Current Assets Noncurrent Assets Customer collections related to transition bonds used only to service debt and pay expenses $ 22 $ - $ 56 $ - Reserve for fees associated with transition bonds 10 - - 10 Reserve for shortfalls of transition bond charges 6 - - 6 Total restricted cash $ 38 $ - $ 56 $ 16 Trade Accounts and Other Receivable s Trade a ccounts and other r eceivable s reported on our balance sheet consisted of the following: At December 31, 2015 2014 Gross trade accounts and other receivables $ 509 $ 528 Trade accounts and other receivables from TCEH (118) (118) Allowance for uncollectible accounts (3) (3) Trade accounts receivable from nonaffiliates – net $ 388 $ 407 At December 31, 201 5 and 201 4 , REP subsidiaries of a nonaffiliated entity collectively represented approximately 13% and 12% , respectively, of the nonaffiliated trade accounts receivable amount. 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 December 31, 2015 2014 Assets related to employee benefit plans, including employee savings programs $ 94 $ 94 Land 3 3 Total investments and other property $ 97 $ 97 The majority of these assets represent cash surrender values of life insurance policies that are purchased to fund liabilities under deferred compensation plans. At December 31, 2015 and 2014, the face amount of these policies totaled $155 million and $167 million, respectively, and the net cash surrender values (determined using a Level 2 valuation technique) totaled $76 million and $76 million, respectively. Changes in cash surrender value are netted against premiums paid. Other investment assets held to satisfy deferred compensation liabilities are recorded at market value. Property, Plant and Equipment Property, plant and equipment reported on our balance sheet consisted of the following: Composite Depreciation Rate/ At December 31, Avg. Life at December 31, 2015 2015 2014 Assets in service: Distribution 4.1% / 24.7 years $ 10,861 $ 10,423 Transmission 2.8% / 35.5 years 7,209 6,861 Other assets 9.0% / 11.1 years 1,002 954 Total 19,072 18,238 Less accumulated depreciation 6,479 6,125 Net of accumulated depreciation 12,593 12,113 Construction work in progress 416 335 Held for future use 15 15 Property, plant and equipment – net $ 13,024 $ 12,463 Depreciation expense as a percent of average depreciable property approximated 3.6% , 3.6% and 3.7% for the years ended December 31, 2015, 2014 and 2013, respectively. Intangible Assets Intangible assets (other than goodwill) reported on our balance sheet consisted of the following: At December 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 $ 467 $ 91 $ 376 $ 463 $ 86 $ 377 Capitalized software 435 269 166 433 242 191 Total $ 902 $ 360 $ 542 $ 896 $ 328 $ 568 A ggregate amortization expense for intangible assets totaled $64 million , $58 million and $53 million for each of the years ended December 31, 201 5 , 201 4 and 201 3, respectively . At December 31, 201 5 , the weighted average remaining useful lives of capitalized land easements and software were 84 years and 3 years, respectively. The estimated aggregate amortization expense for each of the next five fiscal years is as follows: Year Amortization Expense 2016 $ 60 2017 51 2018 46 2019 43 2020 42 At both December 31, 201 5 and 201 4 , goodwill totaling $ 4.1 billion was reported on our balance sheet. None of this goodwill is being deducted for tax purposes. See Note 1 regarding goodwill impairment assessment and testing. Employee Benefit Obligations and Other Employee benefit obligations and other reported on our balance sheet consisted of the following: At December 31, 2015 2014 Retirement plans and other employee benefits $ 1,985 $ 1,894 Uncertain tax positions (including accrued interest) 3 2 Amount payable related to income taxes - 17 Investment tax credits 15 17 Other 60 59 Total other noncurrent liabilities and deferred credits $ 2,063 $ 1,989 Supplemental Cash Flow Information Year Ended December 31, 2015 2014 2013 Cash payments (receipts) related to: Interest $ 346 $ 356 $ 361 Capitalized interest (5) (5) (10) Interest (net of amounts capitalized) $ 341 $ 351 $ 351 Amount in lieu of income taxes: Federal $ 135 $ 269 $ 89 State 43 22 12 Total amount in lieu of income taxes $ 178 $ 291 $ 101 SARs exercise $ - $ - $ 4 Noncash construction expenditures (a) $ 56 $ 82 $ 84 ______________ (a) Represents end-of-period accruals. Quarterly Information (unaudited) Results of operations by quarter for the years ended December 31, 2015 and 2014 are summarized below. In our opinion, all adjustments (consisting of normal recurring accruals) necessary for a fair statement of such amounts have been made. Quarterly results are not necessarily indicative of a full year’s operations because of seasonal and other factors. 2015 First Quarter Second Quarter Third Quarter Fourth Quarter Operating revenues $ 946 $ 938 $ 1,072 $ 922 Operating income 180 186 253 160 Net income 98 98 163 73 2014 First Quarter Second Quarter Third Quarter Fourth Quarter Operating revenues $ 917 $ 912 $ 1,054 $ 939 Operating income 191 183 247 179 Net income 104 94 158 94

Description Of Business and S23

Description Of Business and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 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% , 25 % and 27 % of our total operating revenues for the years ended December 31, 201 5 , 201 4 and 201 3 , 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 VIE (see Note 13) . This financing subsidiary was organized for the limited purpose of issuing certain transition bonds to recover generation-related regulatory asset stranded costs and other qualified costs under an order issued by the PUCT in 2002. Bondco issued an aggregate $ 1.3 billion principal amount of transition bonds during 2003 and 2004. The 2003 Series transition bonds matured in 2015 and were paid in full. The 2004 Series transition bonds , with an outstanding balance of $41 million at December 31, 2015 , mature in May 2016 . Final true-up proceedings for the 2004 Bonds are expected to be conducted by the PUCT during 2016 and are expected to have minimal or zero net income impact. 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 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 consolidated financial statements have been prepared in accordance with US GAAP . All dollar amounts in the financial statements and tables in the notes are stated in millions of US dollars unless otherwise indicated.
Consolidation Of Variable Interest Entities	Consolidation of Variable Interest Entities A VIE is an entity with which we have a relationship or arrangement that indicates some level of control over the entity or results in economic risks to us. We consolidate a VIE if we have: a) the power to direct the significant activities of the VIE and b) the right or obligation to absorb profit and loss from the VIE (primary beneficiary). See Note 13.
Income Taxes	Income Taxes Effective with the November 2008 sale of equity interests to Texas Transmission and Investment LLC, we became a partnership for US federal income tax purposes, and subsequently we are not a member of EFH Corp.’s consolidated tax group and only EFH Corp.’s share of our partnership income is included in its consolidated federal income tax return. Our tax sharing agreement with Oncor Holdings and EFH Corp. was amended in November 2008 to include Texas Transmission and Investment LLC. The tax sharing agreement provides for the calculation of tax liability substantially as if we and Oncor Holdings were taxed as corporations, and requires tax payments to members determined on that basis (without duplication for any income taxes paid by a subsidiary of Oncor Holdings). While partnerships are not subject to income taxes, in consideration of the tax sharing agreement and the presentation of our financial statements as an entity subject to cost-based regulatory rate-setting processes, with such costs including income taxes, the financial statements present amounts determined under the tax sharing agreement as “provision in lieu of income taxes” and “liability in lieu of deferred income taxes” for periods subsequent to the sales of equity interests discussed in Note 4. Such amounts are determined in accordance with the provisions of accounting guidance for income taxes and for uncertainty in income taxes and thus differences between the book and tax bases of assets and liabilities are accounted for as if we were taxed as a corporation. The accounting guidance for rate-regulated enterprises requires the recognition of regulatory assets or liabilities if it is probable such deferred tax amounts will be recovered from, or returned to customers in future rates. Investment tax credits are amortized to income over the estimated lives of the related properties. We classify interest and penalties expense related to uncertain tax positions as current provision in lieu of income taxes as discussed in Note 4.
Use Of Estimates	Use of Estimates Preparation of our financial statements requires management to make estimates and assumptions about future events that affect the reporting of assets and liabilities at the balance sheet dates and the reported amounts of revenue and expense, including fair value measurements. In the event estimates and/or assumptions prove to be different from actual amounts, adjustments are made in subsequent periods to reflect more current information. No material adjustments were made to previous estimates or assumptions during the current year.
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.
Revenue Recognition	Revenue Recognition R evenue includes an estimate for electricity delivery services provided from the billed meter reading date to the end of the period (unbilled revenue). For electricity delivery services billed on the basis of kWh volumes, unbilled revenue is based on data collected through our AMS. For other electricity delivery services, unbilled revenue is based on average daily revenues for the most recent period applied to the number of unmetered days through the end of the period.
Impairment Of Long-Lived Assets And Goodwill	Impairment of Long-Lived Assets and Goodwill We evaluate long-lived assets (including intangible assets with finite lives) for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. We also evaluate goodwill for impairment annually (at December 1) and whenever events or changes in circumstances indicate that an impairment may exist. The determination of the existence of these and other indications of impairment involves judgments that are subjective in nature and may require the use of estimates in forecasting future results and cash flows. If at the assessment date our carrying value exceeds our estimated fair value (enterprise value), then the estimated enterprise value is compared to the estimated fair values of our operating assets (including identifiable intangible assets) and liabilities at the assessment date. The resultant implied goodwill amount is compared to the recorded goodwill amount. Any excess of the recorded goodwill amount over the implied goodwill amount is written off as an impairment charge. The goodwill impairment test s performed in 2015 and 201 4 w ere based on a qualitative assessment in which we considered macroeconomic conditions, industry and market considerations, cost factors, overall financial performance and other relative factors. The g oodwill impairment test performed in 201 3 was based on determinations of enterprise value using discounted cash flow analyses, comparable company equity values and any relevant transactions indicative of enterprise values (quantitative assessment). Based on tests results, no impairments were recognized in 201 5 , 201 4 or 201 3 .
System Of Accounts	System of Accounts Our accounting records have been maintained in accordance with the FERC Uniform System of Accounts as adopted by the PUCT.
Defined Benefit Pension Plans And OPEB Plans	Defined Benefit Pension Plans and OPEB Plans We have liabilities under pension plans that offer benefits based on either a traditional defined benefit formula or a cash balance formula and an OPEB plan that offers certain health care and life insurance benefits to eligible employees and their eligible dependents upon the retirement of such employees from the company. Costs of pension and OPEB plans are dependent upon numerous factors, assumptions and estimates. See Note 10 for additional information regarding pension and OPEB plans.
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.
Fair Value Of Nonderivative Financial Instruments	Fair Value of Nonderivative Financial Instruments The carrying amounts for financial assets classified as current assets and the carrying amounts for financial liabilities classified as current liabilities approximate fair value due to the short maturity of such instruments. The fair values of other financial instruments, for which carrying amounts and fair values have not been presented, are not materially different than their related carrying amounts. The following discussion of fair value accounting standards applies primarily to our determination of the fair value of assets in the pension and OPEB plans trusts (see Note 10) and long-term debt (see Note 7). Accounting standards related to the determination of fair value define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. We use a “mid-market” valuation convention (the mid-point price between bid and ask prices) as a practical expedient to measure fair value for the majority of our assets and liabilities subject to fair value measurement on a recurring basis. We primarily use the market approach for recurring fair value measurements and use valuation techniques to maximize the use of observable inputs and minimize the use of unobservable inputs. We categorize our assets and liabilities recorded at fair value based upon the following fair value hierarchy: · Level 1 valuations use quoted prices in active markets for identical assets or liabilities that are accessible at the measurement date. An active market is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis. · Level 2 valuations use inputs that, in the absence of actively quoted market prices, are observable for the asset or liability, either directly or indirectly. Level 2 inputs include: (a) quoted prices for similar assets or liabilities in active markets, (b) quoted prices for identical or similar assets or liabilities in markets that are not active, (c) inputs other than quoted prices that are observable for the asset or liability such as interest rates and yield curves observable at commonly quoted intervals and (d) inputs that are derived principally from or corroborated by observable market data by correlation or other means. Our Level 2 valuations utilize over-the-counter broker quotes, quoted prices for similar assets or liabilities that are corroborated by correlations or other mathematical means and other valuation inputs. · Level 3 valuations use unobservable inputs for the asset or liability. Unobservable inputs are used to the extent observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date. We use the most meaningful information available from the market combined with internally developed valuation methodologies to develop our best estimate of fair value. We utilize several different valuation techniques to measure the fair value of assets and liabilities, relying primarily on the market approach of using prices and other market information for identical and/or comparable assets and liabilities for those items that are measured on a recurring basis.
Franchise Taxes	Franchise Taxes Franchise taxes are assessed to us by local governmental bodies, based on kWh delivered and are the principal component of taxes other than amounts related to income taxes as reported in the income statement. Franchise taxes are not a “pass through” item. The rates we charge customers are intended to recover the franchise taxes, but we are not acting as an agent to collect the taxes from customers.
Cash And Cash Equivalents	Cash and Cash Equivalents For purposes of reporting cash and cash equivalents, temporary cash investments purchased with a remaining maturity of three months or less are considered to be cash equivalents. See Note 13 for details regarding restricted cash.
Property, Plant And Equipment	Property, Plant and Equipment Properties are stated at original cost. The cost of self-constructed property additions includes materials and both direct and indirect labor and applicable overhead and an allowance for funds used during construction. D epreciation of property, plant and equipment is calculated on a straight-line basis over the estimated service lives of the properties based on depreciation rates approved by the PUCT. As is common in the industry, depreciation expense is recorded using composite depreciation rates that reflect blended estimates of the lives of major asset groups as compared to depreciation expense calculated on a component asset-by-asset basis. Depreciation rates include plant removal costs as a component of depreciation expense, consistent with regulatory treatment. Actual removal costs incurred are charged to accumulated depreciation. When accrued removal costs exceed incurred removal costs, the difference is reclassified as a regulatory obligation to retire assets in the future.
Allowance For Funds Used During Construction (AFUDC)	Allowance for Funds Used During Construction (AFUDC) AFUDC is a regulatory cost accounting procedure whereby both interest charges on borrowed funds and a return on equity capital used to finance construction are included in the recorded cost of utility plant and equipment being constructed. AFUDC is capitalized on all projects involving construction periods lasting greater than thirty days. The equity portion , if any, of capitalized AFUDC is accounted for as other income . See Note 13 for detail of amounts charged to interest expense.
Regulatory Assets And Liabilities	Regulatory Assets and Liabilities Our financial statements reflect regulatory assets and liabilities under cost-based rate regulation in accordance with accounting standards related to the effect of certain types of regulation. Regulatory decisions can have an impact on the recovery of costs, the rate earned on invested capital and the timing and amount of assets to be recovered by rates. See Note 5 for details of regulatory assets and liabilities.
Changes In Accounting Standards	Changes in Accounting Standards In April 2015, the Financial Accounting Standards Board issued Accounting Standards Update No. 2015-03 (ASU 2015-03), Simplifying the Presentation of Debt Issuance Costs . The update requires that debt issuance costs be presented as a direct reduction to the face value of the related debt liability rather than as an asset, consistent with the presentation of debt discounts. We adopted ASU 2015-03 as of December 31, 2015, and applied its provisions retrospectively. The adoption resulted in the reclassification of $36 million and $34 million of unamortized debt issuance costs from other non-current assets to long-term debt within the consolidated balance sheets as of December 31, 2015 and December 31, 2014, respectively. Other than this reclassification, the adoption of ASU 2015-03 did not have an impact on our reported results of operations, financial condition or cash flows. In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update No. 2014-09 (ASU 2014-09), Revenue from Contracts with Customers . ASU 2014-09 introduces new, increased requirements for disclosure of revenue in financial statements and is intended to eliminate inconsistencies in revenue recognition and thereby improve financial reporting comparability across entities, industries and capital markets. ASU 2014-09 is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 201 7 for public entities. Early application is permitted only as of annual reporting periods beginning after December 31, 2016, including interim reporting periods within that reporting period. We are currently evaluating the potential impact of ASU 2014-09. The adoption of ASU 2014-09 is not expected to have a material effect on our reported results of operations, financial condition or cash flows.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Taxes [Abstract]
Components Of Income Tax Provisions (Benefits)	Year Ended December 31, 2015 2014 2013 Reported in operating expenses: Current: US federal $ 189 $ 113 $ 51 State 32 24 12 Deferred: US federal 55 146 181 State (13) - 6 Amortization of investment tax credits (3) (3) (3) Total reported in operating expenses 260 280 247 Reported in other income and deductions: Current: US federal (7) (4) (5) State - - - Deferred federal (1) 2 7 Total reported in other income and deductions (8) (2) 2 Total provision in lieu of income taxes $ 252 $ 278 $ 249
Schedule Of Income Tax Reconciliation	Year Ended December 31, 2015 2014 2013 Income before provision in lieu of income taxes $ 684 $ 728 $ 681 Provision in lieu of income taxes at the US federal statutory rate of 35% $ 239 $ 255 $ 238 Amortization of investment tax credits – net of deferred tax effect (3) (3) (3) Amortization (under regulatory accounting) of statutory tax rate changes (1) (2) (2) Amortization of Medicare subsidy regulatory asset - 14 14 Texas margin tax, net of federal tax benefit 13 16 15 Nondeductible losses (gains) on benefit plan investments - (2) (3) Other, including audit settlements 4 - (10) Reported provision in lieu of income taxes $ 252 $ 278 $ 249 Effective rate 36.8% 38.2% 36.6%
Schedule Of Changes To Uncertain Tax Positions	2015 2014 2013 Balance at January 1, excluding interest and penalties $ 2 $ 54 $ 144 Additions based on tax positions related to prior years - - - Reductions based on tax positions related to prior years - (16) (66) Settlements with taxing authorities 1 (36) (24) Balance at December 31, excluding interest and penalties $ 3 $ 2 $ 54

Regulatory Assets and Liabili25

Regulatory Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2015
Regulatory Assets and Liabilities [Abstract]
Components Of Regulatory Assets And Liabilities	Remaining Rate Recovery/Amortization Period at Carrying Amount At December 31, 2015 December 31, 2015 December 31, 2014 Regulatory assets: Generation-related regulatory assets securitized by transition bonds (a)(e) < 1 year $ 31 $ 148 Employee retirement costs 4 years 38 55 Employee retirement costs to be reviewed (b)(c) To be determined 291 246 Employee retirement liability (a)(c)(d) To be determined 853 865 Self-insurance reserve (primarily storm recovery costs) ― net 4 years 95 127 Self-insurance reserve to be reviewed ― net (b)(c) To be determined 332 242 Securities reacquisition costs (pre-industry restructure) 1 year 14 23 Securities reacquisition costs (post-industry restructure) ― net Lives of related debt 9 7 Recoverable amounts in lieu of deferred income taxes ― net Life of related asset or liability 12 14 Deferred conventional meter and metering facilities depreciation Largely 5 years 100 123 Deferred AMS costs To be determined 164 113 Energy efficiency performance bonus (a) 1 year 10 22 Under-recovered wholesale transmission service expense ― net (a) - 26 Other regulatory assets Various 9 12 Total regulatory assets 1,958 2,023 Regulatory liabilities: Estimated net removal costs Lives of related assets 686 531 Investment tax credit and protected excess deferred taxes Various 14 18 Over-collection of transition bond revenues (a)(e) 1 year 29 32 Over-recovered wholesale transmission service expense ― net (a) 1 year 24 - Energy efficiency programs (a) Not applicable 11 13 Total regulatory liabilities 764 594 Net regulatory asset $ 1,194 $ 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 $ 10 million at December 31, 2015 consisted of $ 31 million included in generation-related regulatory assets net of the regulatory liability for over-collection of transition bond revenues of $ 21 million (excludes $8 million of over-collections related to Series 2003-1 transition bonds assumed by Oncor for final settlement). 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.

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2015
Long-Term Debt [Abstract]
Schedule Of Long-Term Debt	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 and debt issuance costs (54) (51) Less amount due currently - (500) Long-term debt, less amounts due currently — Oncor 5,646 4,924 Bondco (b): 5.420% Fixed Series 2003 Bonds due in semiannual installments through August 15, 2015 - 54 5.290% Fixed Series 2004 Bonds due in semiannual installments through May 15, 2016 41 126 Debt issuance costs - (1) Total 41 179 Less amount due currently (41) (139) Long-term debt, less amounts due currently — Bondco - 40 Total long-term debt, less amounts due currently $ 5,646 $ 4,964 __________ (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.
Schedule Of Long-Term Debt Maturity	Year Amount 2016 $ 41 2017 324 2018 550 2019 250 2020 126 Thereafter 4,450 Unamortized discount and debt issuance costs (54) Total $ 5,687

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies [Abstract]
Schedule Of Future Miinimum Lease Payments Under Operating Leases	Year Amount 2016 $ 9 2017 1 2018 1 2019 1 2020 - Thereafter - Total future minimum lease payments $ 12

Membership Interests (Tables)

Membership Interests (Tables)	12 Months Ended
	Dec. 31, 2015
Membership Interests [Abstract]
Schedule Of Distributions Paid	During 2015, our board of directors declared, and we paid, the following cash distributions to our members: Declaration Date Payment Date Amount December 9, 2015 December 11, 2015 $ 18 October 27, 2015 November 9, 2015 $ 135 July 29, 2015 August 10, 2015 $ 118 April 29, 2015 May 15, 2015 $ 65 February 25, 2015 February 26, 2015 $ 100 During 2014, our board of directors declared, and we paid, the following cash distributions to our members: Declaration Date Payment Date Amount October 21, 2014 October 22, 2014 $ 101 July 30, 2014 July 31, 2014 $ 71 April 30, 2014 May 1, 2014 $ 57 February 19, 2014 February 20, 2014 $ 53
Schedule Of Changes To Accumulated Other Comprehensive Income (Loss)	The following table present s the changes to accumulated other comprehensive income (loss) for the year s ended December 31, 2015 , 2014 and 2013 . 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) - (8) (8) Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges 2 - 2 Balance at December 31, 2015 $ (22) $ (91) $ (113) Balance at December 31, 2013 $ (26) $ (22) $ (48) Defined benefit pension plans (net of tax) - (61) (61) Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges 2 - 2 Balance at December 31, 2014 $ (24) $ (83) $ (107) Balance at December 31, 2012 $ (28) $ (3) $ (31) Defined benefit pension plans (net of tax) - (19) (19) Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges 2 - 2 Balance at December 31, 2013 $ (26) $ (22) $ (48)

Pension and Other Postretirem29

Pension and Other Postretirement Employee Benefits (OPEB) Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Schedule Of Pension And OPEB Plan Costs	Year Ended December 31, 2015 2014 2013 Pension costs $ 104 $ 58 $ 95 OPEB costs 53 48 37 Total benefit costs 157 106 132 Less amounts deferred principally as property or a regulatory asset (113) (69) (95) Net amounts recognized as expense $ 44 $ 37 $ 37
Schedule Of Detailed Pension And OPEB Benefit Information	Detailed Information Regarding Pension and OPEB Benefits The following pension and OPEB information is based on December 31, 201 5 , 201 4 and 201 3 measurement dates: Pension Plans OPEB Plan Year Ended December 31, Year Ended December 31, 2015 2014 2013 2015 2014 2013 Assumptions Used to Determine Net Periodic Pension and OPEB Costs: Discount rate (a) 3.96% 4.74% 4.10% 4.23% 4.98% 4.10% Expected return on plan assets 5.26% 6.47% 6.14% 6.65% 7.05% 6.70% Rate of compensation increase 3.29% 3.94% 3.94% - - - Components of Net Pension and OPEB Costs: Service cost $ 25 $ 23 $ 26 $ 7 $ 6 $ 6 Interest cost 131 132 122 43 44 36 Expected return on assets (115) (136) (123) (10) (12) (11) Amortization of prior service cost (credit) - - - (20) (20) (20) Amortization of net loss 63 39 69 33 30 26 Settlement charges - - 1 - - - Net periodic pension and OPEB costs $ 104 $ 58 $ 95 $ 53 $ 48 $ 37 Other Changes in Plan Assets and Benefit Obligations Recognized as Regulatory Assets or in Other Comprehensive Income: Net loss (gain) $ 37 $ 388 $ (139) $ 39 $ 128 $ - Amortization of net loss (63) (39) (69) (33) (30) (26) Amortization of prior service (cost) credit - - - 20 20 20 Settlement charges - - (1) - - - Total recognized as regulatory assets or other comprehensive income (26) 349 (209) 26 118 (6) Total recognized in net periodic pension and OPEB costs and as regulatory assets or other comprehensive income $ 78 $ 407 $ (114) $ 79 $ 166 $ 31 _______________ (a) As a result of the transfer of OPEB plan assets and liabilities from the EFH OPEB Plan to the Oncor OPEB Plan discussed above, the discount rate reflected in OPEB costs for January through June 2014 was 4.98% and for July through December 2014 was 4.39% . Pension Plans OPEB Plan Year Ended December 31, Year Ended December 31, 2015 2014 2013 2015 2014 2013 Assumptions Used to Determine Benefit Obligations at Period End: Discount rate 4.30% 3.96% 4.74% 4.60% 4.23% 4.98% Rate of compensation increase 3.29% 3.29% 3.94% - - - Pension Plans OPEB Plan Year Ended December 31, Year Ended December 31, 2015 2014 2015 2014 Change in Projected Benefit Obligation: Projected benefit obligation at beginning of year $ 3,379 $ 2,857 $ 1,054 $ 924 Service cost 25 23 7 6 Interest cost 131 132 43 44 Participant contributions - - 15 15 Actuarial (gain) loss (181) 515 25 128 Benefits paid (153) (148) (56) (63) Projected benefit obligation at end of year $ 3,201 $ 3,379 $ 1,088 $ 1,054 Accumulated benefit obligation at end of year $ 3,100 $ 3,260 $ - $ - Change in Plan Assets: Fair value of assets at beginning of year $ 2,454 $ 2,271 $ 161 $ 179 Actual return (loss) on assets (103) 263 (4) 12 Employer contributions 54 68 25 18 Participant contributions - - 15 15 Benefits paid (153) (148) (56) (63) Fair value of assets at end of year $ 2,252 $ 2,454 $ 141 $ 161 Funded Status: Projected benefit obligation at end of year $ (3,201) $ (3,379) $ (1,088) $ (1,054) Fair value of assets at end of year 2,252 2,454 141 161 Funded status at end of year $ (949) $ (925) $ (947) $ (893) Pension Plans OPEB Plan Year Ended December 31, Year Ended December 31, 2015 2014 2015 2014 Amounts Recognized in the Balance Sheet Consist of: Liabilities: Other current liabilities $ (4) $ (4) $ - $ - Other noncurrent liabilities (945) (921) (947) (893) Net liability recognized $ (949) $ (925) $ (947) $ (893) Regulatory assets: Net loss $ 583 $ 619 $ 320 $ 316 Prior service cost (credit) - - (50) (70) Net regulatory asset recognized $ 583 $ 619 $ 270 $ 246 Accumulated other comprehensive net loss $ 136 $ 126 $ 4 $ 2
Schedule Of Assumed Health Care Cost Trend Rates	Year Ended December 31, 2015 2014 Assumed Health Care Cost Trend Rates – Not Medicare Eligible: Health care cost trend rate assumed for next year 6.00% 8.00% Rate to which the cost trend is expected to decline (the ultimate trend rate) 5.00% 5.00% Year that the rate reaches the ultimate trend rate 2024 2022 Assumed Health Care Cost Trend Rates – Medicare Eligible: Health care cost trend rate assumed for next year 5.80% 6.50% Rate to which the cost trend is expected to decline (the ultimate trend rate) 5.00% 5.00% Year that the rate reaches the ultimate trend rate 2024 2021 1-Percentage Point Increase 1-Percentage Point Decrease Sensitivity Analysis of Assumed Health Care Cost Trend Rates: Effect on accumulated postretirement obligation $ 152 $ (125) Effect on postretirement benefits cost 8 (7)
Schedule Of Projected Benefit Obligations And Accumulated Benefit Obligations In Excess Of Plan Assets Fair Value	At December 31, 2015 2014 Pension Plan with PBO and ABO in Excess of Plan Assets: Projected benefit obligations $ 3,035 $ 3,379 Accumulated benefit obligations 2,944 3,260 Plan assets 2,085 2,454
Schedule Of Target Asset Allocation Ranges By Asset Category	Target Allocation Ranges Asset Category Recoverable Nonrecoverable US equities 17% - 21% 6% - 10% International equities 14% - 18% 5% - 9% Fixed income 48% - 60% 76% - 84% Real estate 4% - 5% - Credit strategies 6% - 8% 4% - 6%
Schedule Of Expected Long-Term Rate Of Return On Assets Assumptions	Pension Plans OPEB Plan Asset Class Expected Long-Term Rate of Return Asset Class Expected Long-Term Rate of Return International equity securities 7.45% 401(h) accounts 6.93% US equity securities 6.64% Life insurance VEBA 6.16% Real estate 5.70% Union VEBA 6.16% Credit strategies 5.70% Non-union VEBA 2.50% Fixed income securities 4.80% Weighted average 6.30% Weighted average (a) 5.83% _____________ (a) The 2016 expected long-term rate of return for the nonregulated portion of the Oncor Retirement Plan is 4.97% .
Schedule Of Contributions	Year Ended December 31, 2015 2014 2013 Pension plans contributions $ 54 $ 68 $ 9 OPEB plan contributions 25 18 11 Total contributions $ 79 $ 86 $ 20
Schedule Of Estimated Future Benefit Payments	2016 2017 2018 2019 2020 2021-25 Pension plans $ 167 $ 171 $ 177 $ 182 $ 188 $ 1,006 OPEB plan $ 49 $ 52 $ 54 $ 57 $ 60 $ 334
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule Of Assets Fair Value Measured On Recurring Basis	At December 31, 2015 At December 31, 2014 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Asset Category Interest-bearing cash $ - $ 133 $ - $ 133 $ - $ 120 $ - $ 120 Equity securities: US 201 93 - 294 233 85 - 318 International 255 13 - 268 281 12 - 293 Fixed income securities: Corporate bonds (a) - 1,137 - 1,137 - 1,384 - 1,384 US Treasuries - 189 - 189 - 143 - 143 Other (b) - 145 - 145 - 157 - 157 Real estate - 81 5 86 - 31 8 39 Total assets $ 456 $ 1,791 $ 5 $ 2,252 $ 514 $ 1,932 $ 8 $ 2,454 _____________ (a) Substantially all corporate bonds are rated investment grade by a major ratings agency such as Moody’s. (b) Other consists primarily of municipal bonds, emerging market debt, bank loans and fixed income derivative instruments.
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule Of Assets Fair Value Measured On Recurring Basis	At December 31, 2015 At December 31, 2014 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Asset Category Interest-bearing cash $ 4 $ 2 $ - $ 6 $ 2 $ 3 $ - $ 5 Equity securities: US 39 4 - 43 54 4 - 58 International 25 - - 25 31 - - 31 Fixed income securities: Corporate bonds (a) - 30 - 30 - 31 - 31 US Treasuries - 1 - 1 - 1 - 1 Other (b) 35 1 - 36 34 1 - 35 Total assets $ 103 $ 38 $ - $ 141 $ 121 $ 40 $ - $ 161 _____________ (a) Substantially all corporate bonds are rated investment grade by a major ratings agency such as Moody’s. (b) Other consists primarily of diversified bond mutual funds.

Related-Party Transactions (Tab

Related-Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2015
Related-Party Transactions [Abstract]
Schedule Of Trade Accounts And Other Receivables From Related Parties	At December 31, 2015 2014 Trade accounts and other receivables from affiliates $ 120 $ 123 Trade accounts and other payables to affiliates (2) (5) Trade accounts and other receivables from affiliates – net $ 118 $ 118
Schedule Of Related Party Transactions	Amounts payable to (receivable from) members related to income taxes under the agreement and reported on our balance sheet consisted of the following: At December 31, 2015 At December 31, 2014 EFH Corp. Texas Transmission Total EFH Corp. Texas Transmission Total Federal income taxes receivable $ (109) $ (27) $ (136) $ (144) $ (36) $ (180) Texas margin taxes payable 20 - 20 24 - 24 Net payable (receivable) $ (89) $ (27) $ (116) $ (120) $ (36) $ (156) Cash payments made to (received from) members related to income taxes consisted of the following: Year Ended December 31, 2015 Year Ended December 31, 2014 Year Ended December 31, 2013 EFH Corp. Texas Transm. Total EFH Corp. Texas Transm. Total EFH Corp. Texas Transm. Total Federal income taxes (a) $ 108 $ 27 $ 135 $ 215 $ 54 $ 269 $ 78 $ 11 $ 89 Texas margin taxes (b) 24 - 24 22 - 22 12 - 12 Total payments (receipts) $ 132 $ 27 $ 159 $ 237 $ 54 $ 291 $ 90 $ 11 $ 101 ______________ (a) Includes $33 million payment made to EFH Corp. in 2013 related to the 1997-2002 IRS appeals settlement. (b) Includes $10 million refund received from EFH Corp. in 2013 related to 1997-2001 amended Texas franchise tax returns.

Supplementary Financial Infor31

Supplementary Financial Information (Tables)	12 Months Ended
	Dec. 31, 2015
Supplementary Financial Information [Abstract]
Schedule Of Other Income And Deductions	Year Ended December 31, 2015 2014 2013 Other income: Accretion of fair value adjustment (discount) to regulatory assets due to purchase accounting $ 5 $ 12 $ 17 Net gain on sale of other properties and investments 1 1 1 Total other income $ 6 $ 13 $ 18 Other deductions: Professional fees $ 19 $ 14 $ 10 Non-recoverable pension (Note 10) and other 9 1 5 Total other deductions $ 28 $ 15 $ 15
Schedule Of Interest Expense And Related Charges	Year Ended December 31, 2015 2014 2013 Interest expense $ 335 $ 355 $ 360 Amortization of debt issuance costs and discounts 3 3 21 Allowance for funds used during construction – capitalized interest portion (5) (5) (10) Total interest expense and related charges $ 333 $ 353 $ 371
Schedule Of Restricted Cash	At December 31, 2015 At December 31, 2014 Current Assets Noncurrent Assets Current Assets Noncurrent Assets Customer collections related to transition bonds used only to service debt and pay expenses $ 22 $ - $ 56 $ - Reserve for fees associated with transition bonds 10 - - 10 Reserve for shortfalls of transition bond charges 6 - - 6 Total restricted cash $ 38 $ - $ 56 $ 16
Schedule Of Trade Accounts Receivable	At December 31, 2015 2014 Gross trade accounts and other receivables $ 509 $ 528 Trade accounts and other receivables from TCEH (118) (118) Allowance for uncollectible accounts (3) (3) Trade accounts receivable from nonaffiliates – net $ 388 $ 407
Summary of Investment Balance	At December 31, 2015 2014 Assets related to employee benefit plans, including employee savings programs $ 94 $ 94 Land 3 3 Total investments and other property $ 97 $ 97
Schedule Of Property, Plant And Equipment	Composite Depreciation Rate/ At December 31, Avg. Life at December 31, 2015 2015 2014 Assets in service: Distribution 4.1% / 24.7 years $ 10,861 $ 10,423 Transmission 2.8% / 35.5 years 7,209 6,861 Other assets 9.0% / 11.1 years 1,002 954 Total 19,072 18,238 Less accumulated depreciation 6,479 6,125 Net of accumulated depreciation 12,593 12,113 Construction work in progress 416 335 Held for future use 15 15 Property, plant and equipment – net $ 13,024 $ 12,463
Schedule Of Intangible Assets	At December 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 $ 467 $ 91 $ 376 $ 463 $ 86 $ 377 Capitalized software 435 269 166 433 242 191 Total $ 902 $ 360 $ 542 $ 896 $ 328 $ 568
Schedule Of Estimated Aggregate Amortization Expenses	Year Amortization Expense 2016 $ 60 2017 51 2018 46 2019 43 2020 42
Schedule Of Employee Benefit Obligations And Other	At December 31, 2015 2014 Retirement plans and other employee benefits $ 1,985 $ 1,894 Uncertain tax positions (including accrued interest) 3 2 Amount payable related to income taxes - 17 Investment tax credits 15 17 Other 60 59 Total other noncurrent liabilities and deferred credits $ 2,063 $ 1,989
Schedule Of Supplemental Cash Flow Information	Year Ended December 31, 2015 2014 2013 Cash payments (receipts) related to: Interest $ 346 $ 356 $ 361 Capitalized interest (5) (5) (10) Interest (net of amounts capitalized) $ 341 $ 351 $ 351 Amount in lieu of income taxes: Federal $ 135 $ 269 $ 89 State 43 22 12 Total amount in lieu of income taxes $ 178 $ 291 $ 101 SARs exercise $ - $ - $ 4 Noncash construction expenditures (a) $ 56 $ 82 $ 84 ______________ (a) Represents end-of-period accruals.
Schedule Of Quarterly Information	2015 First Quarter Second Quarter Third Quarter Fourth Quarter Operating revenues $ 946 $ 938 $ 1,072 $ 922 Operating income 180 186 253 160 Net income 98 98 163 73 2014 First Quarter Second Quarter Third Quarter Fourth Quarter Operating revenues $ 917 $ 912 $ 1,054 $ 939 Operating income 191 183 247 179 Net income 104 94 158 94

Description Of Business And S32

Description Of Business And Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2004	Dec. 31, 2003
Description of Business [Line Items]
Principal amount of transition bonds issued				$ 1,300	$ 1,300
2004 Series transition bonds outstanding	$ 41
2004 Series transition bonds maturity date	May 31, 2016
Long-lived assets and goodwill impairments	$ 0	$ 0	$ 0
Reclassification of unamortized debt issuance costs from non-current assets to long-term debt	$ 36	$ 34
Sales [Member] | TCEH [Member]
Description of Business [Line Items]
Concentration risk percentage	25.00%	25.00%	27.00%
Oncor [Member]
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 ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Apr. 28, 2014
Bankruptcy [Line Items]
Amount receivable from related party		$ 129
Amount collected from related party	$ 127
Plan Of Reorganization [Member]
Bankruptcy [Line Items]
Percent of outstanding equity interests required	80.03%
Intended raise of equity and debt for investment	$ 12,600

Regulatory Matters (Details)

Regulatory Matters (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)item
Regulatory Matters [Abstract]
Number of original jurisdiction cities	204
Number of other parties appealed various portions of rate review final order to state district court	4
Number of issues revised judgment	2
Estimated impact on earnings, minimum | $	$ 0
Estimated impact on earnings, maximum | $	$ 135
Rate at which interest accrues for over-collections for 2016	0.18%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2015	Mar. 31, 2014
Related Party Transaction [Line Items]
Liability in lieu of deferred income taxes			$ 2,559			$ 2,612
Increase (Decrease) in liability for uncertain tax positions			(35)				$ (18)
Increase (Decrease) in liability for deferred income taxes							16
Reversal of provision in lieu of income taxes				$ 1
Reversal of accrued interest and tax							2
Reversal of accrued interest and tax after tax							$ 1
Uncertain tax positions related to timing of recognition			3			3
Accrued interest related to uncertain tax positions			0			0
Benefit (Expense) from interest and penalties, after tax			1		$ 15	$ 0
EFH Corp [Member]
Related Party Transaction [Line Items]
Income tax payments to members					33
Income tax refunds from members					$ 10
Tax Year 2003 To 2006 [Member]
Related Party Transaction [Line Items]
Increase (Decrease) in liability in lieu of deferred income taxes			$ 11
Tax Year 2007 [Member]
Related Party Transaction [Line Items]
Liability for uncertain tax positions, released				1
Tax Year 2007 [Member] | EFH Corp [Member]
Related Party Transaction [Line Items]
Expected tax refund				$ 45
Tax Year 2008 And 2009 [Member] | EFH Corp [Member]
Related Party Transaction [Line Items]
Increase (Decrease) in liability in lieu of deferred income taxes		$ 4
Income tax refunds from members	$ 4	$ 8

Income Taxes (Components Of Inc

Income Taxes (Components Of Income Tax Provisions (Benefits)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Current: US federal	$ 189	$ 113	$ 51
Current: State	32	24	12
Deferred: US federal	55	146	181
Deferred: State	(13)		6
Amortization of investment tax credits	(3)	(3)	(3)
Total reported in operating expenses	260	280	247
Current: US federal	(7)	(4)	(5)
Deferred federal	(1)	2	7
Total reported in other income and deductions	(8)	(2)	2
Total/Reported provision in lieu of income taxes	$ 252	$ 278	$ 249

Income Taxes (Schedule Of Incom

Income Taxes (Schedule Of Income Tax Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Income before provision in lieu of income taxes	$ 684	$ 728	$ 681
Provision in lieu of income taxes at the US federal statutory rate of 35%	239	255	238
Amortization of investment tax credits - net of deferred tax effect	(3)	(3)	(3)
Amortization (under regulatory accounting) of statutory tax rate changes	(1)	(2)	(2)
Amortization of Medicare subsidy regulatory asset		14	14
Texas margin tax, net of federal tax benefit	13	16	15
Nondeductible losses (gains) on benefit plan investments		(2)	(3)
Other, including audit settlements	4		(10)
Total/Reported provision in lieu of income taxes	$ 252	$ 278	$ 249
Effective rate	36.80%	38.20%	36.60%
US federal statutory rate	35.00%	35.00%	35.00%

Income Taxes (Schedule Of Chang

Income Taxes (Schedule Of Changes To Uncertain Tax Positions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Balance at January 1, excluding interest and penalties	$ 2	$ 54	$ 144
Reductions based on tax positions related to prior years		(16)	(66)
Settlements with taxing authorities, increase	1
Settlements with taxing authorities, decrease		(36)	(24)
Balance at December 31, excluding interest and penalties	$ 3	$ 2	$ 54

Regulatory Assets And Liabili39

Regulatory Assets And Liabilities (Narrative) (Details) - USD ($)	Oct. 10, 2007	Dec. 31, 2015	Dec. 31, 2014
Regulatory Assets And Liabilities [Line Items]
Expected surcharge		$ 1,023,000,000
Recovery period		11 years
Net regulatory asset		$ 1,194,000,000	$ 1,429,000,000
Residential Retail Customer [Member]
Regulatory Assets And Liabilities [Line Items]
Cost recovery factor		2.19
Minimum [Member] | Non-Residential Retail Customer [Member]
Regulatory Assets And Liabilities [Line Items]
Cost recovery factor		2.39
Maximum [Member] | Non-Residential Retail Customer [Member]
Regulatory Assets And Liabilities [Line Items]
Cost recovery factor		5.15
Over Collection of Transition Bond Revenues [Member]
Regulatory Assets And Liabilities [Line Items]
Recovery period	9 years
Net regulatory asset		21,000,000	32,000,000
Deferred AMS Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Net regulatory asset		164,000,000	113,000,000
Generation-Related Regulatory Assets Securitized by Transition Bonds [Member]
Regulatory Assets And Liabilities [Line Items]
Reduction in regulatory assets net of regulatory liability		213,000,000
Net regulatory asset		$ 31,000,000	$ 140,000,000

Regulatory Assets And Liabili40

Regulatory Assets And Liabilities (Components Of Regulatory Assets And Liabilities) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Regulatory Assets And Liabilities [Line Items]
Carrying Amount, Regulatory Assets		$ 1,958	$ 2,023
Carrying Amount, Regulatory Liabilities		764	594
Net regulatory asset		1,194	1,429
Bondco [Member]
Regulatory Assets And Liabilities [Line Items]
Net regulatory asset		$ 10	108
Estimated Net Removal Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period		Lives of related assets
Carrying Amount, Regulatory Liabilities		$ 686	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		$ 14	18
Over Collection of Transition Bond Revenues [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	[1],[2]	1 year
Carrying Amount, Regulatory Liabilities	[1],[2]	$ 29	32
Net regulatory asset		$ 21	32
Over Recovered Wholesale Transmission Service Expense ― Net [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period		1 year
Carrying Amount, Regulatory Liabilities		$ 24
Energy Efficiency Programs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	[2]	Not applicable
Carrying Amount, Regulatory Liabilities	[2]	$ 11	13
Excluded Over-Collected Series 2003-1 Transition Bond Revenues [Member]
Regulatory Assets And Liabilities [Line Items]
Net regulatory asset		$ 8
Generation-Related Regulatory Assets Securitized by Transition Bonds [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	[1],[2]	< 1 year
Carrying Amount, Regulatory Assets	[1],[2]	$ 31	148
Net regulatory asset		$ 31	140
Employee Retirement Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period		4 years
Carrying Amount, Regulatory Assets		$ 38	55
Employee Retirement Costs to be Reviewed [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	[3],[4]	To be determined
Carrying Amount, Regulatory Assets	[3],[4]	$ 291	246
Employee Retirement Liability [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	[2],[4],[5]	To be determined
Carrying Amount, Regulatory Assets	[2],[4],[5]	$ 853	865
Self-Insurance Reserve (Primarily Storm Recovery Costs) - Net [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period		4 years
Carrying Amount, Regulatory Assets		$ 95	127
Self-Insurance Reserve to be Reviewed [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	[3],[4]	To be determined
Carrying Amount, Regulatory Assets	[3],[4]	$ 332	242
Securities Reacquisition Costs (Pre-Industry Restructure) [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period		1 year
Carrying Amount, Regulatory Assets		$ 14	23
Securities Reacquisition Costs (Post-Industry Restructure) - Net [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period		Lives of related debt
Carrying Amount, Regulatory Assets		$ 9	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		$ 12	14
Deferred Conventional Meter And Metering Facilities Depreciation [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period		Largely 5 years
Carrying Amount, Regulatory Assets		$ 100	123
Deferred AMS Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period		To be determined
Carrying Amount, Regulatory Assets		$ 164	113
Net regulatory asset		$ 164	113
Energy Efficiency Performance Bonus [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period	[2]	1 year
Carrying Amount, Regulatory Assets	[2]	$ 10	22
Under-Recovered Wholesale Transmission Service Expense - Net [Member]
Regulatory Assets And Liabilities [Line Items]
Carrying Amount, Regulatory Assets	[2]		26
Other Regulatory Assets [Member]
Regulatory Assets And Liabilities [Line Items]
Remaining Rate Recovery/Amortization Period		Various
Carrying Amount, Regulatory Assets		$ 9	$ 12
[1]	Bondco net regulatory assets of $10 million at December 31, 2015 consisted of $31 million included in generation-related regulatory assets net of the regulatory liability for over-collection of transition bond revenues of $21 million (excludes $8 million of over-collections related to Series 2003-1 transition bonds assumed by Oncor for final settlement). 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.
[2]	Not earning a return in the regulatory rate-setting process.
[3]	Costs incurred since the period covered under the last rate review.
[4]	Recovery is specifically authorized by statute or by the PUCT, subject to reasonableness review.
[5]	Represents unfunded liabilities recorded in accordance with pension and OPEB accounting standards.

Borrowings Under Credit Facil41

Borrowings Under Credit Facilities (Details) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2015USD ($)	Dec. 31, 2015USD ($)contract	Dec. 31, 2014USD ($)
Line of Credit Facility [Line Items]
Commitment fee		0.125%
Borrowing capacity available under the credit facility		$ 1,153	$ 1,682
Available bond credits		$ 2,577
Maximum [Member]
Line of Credit Facility [Line Items]
Commitment rate reduction under the revolving credit facility		0.275%
Required debt-to-capitalization ratio		1
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
Debt-to-capitalization ratio		0.46
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Outstanding borrowing, interest rate		1.325%
Letters of credit		$ 7	7
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Secured revolving credit facility	$ 2,400
Remaining available capacity under line of credit facility	$ 2,000
Number of exercised extensions of revolving credit facility | contract		1
Number of revolving credit facilities extension options | contract		2
Expiration of revolving credit facility		Oct. 31, 2017
Extension period for revolving line of credit		1 year
Additional increase in borrowing capacity amount		$ 100
Outstanding borrowing under the revolving credit facility		$ 840	$ 711
Outstanding borrowing, interest rate		1.48%	1.29%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Spread over variable rate		1.125%
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 London Interbank Offered Rate [Member]
Line of Credit Facility [Line Items]
Spread over variable rate		1.00%
One Month London Interbank Offered Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Spread over variable rate		0.75%
One Month London Interbank Offered Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Spread over variable rate		0.00%

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($)		1 Months Ended		12 Months Ended
		Mar. 31, 2015	May. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Repayments of long-term debt				$ 639,000,000		$ 131,000,000		$ 125,000,000
Proceeds from sale of Notes		$ 714,000,000
Proceeds from issuance of long-term debt				$ 725,000,000		250,000,000		$ 100,000,000
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				$ 6,287,000,000		6,844,000,000
Carrying amount				5,687,000,000		$ 5,603,000,000
Available bond credits				2,577,000,000
Future debt subject to property additions to the Deed of Trust				1,261,000,000
6.375% Fixed Senior Notes Due January 15, 2015 [Member]
Debt Instrument [Line Items]
Repayments of long-term debt				$ 639,000,000
Interest percentage	[1]			6.375%		6.375%
6.375% Fixed Senior Notes Due January 15, 2015 [Member] | Oncor [Member]
Debt Instrument [Line Items]
Aggregate principal amount	[1]					$ 500,000,000
Transition Bond [Member]
Debt Instrument [Line Items]
Repayments of long-term debt						$ 131,000,000
Debt principal amount				$ 139,000,000
2.950% Fixed Senior Notes due April 1, 2025 [Member]
Debt Instrument [Line Items]
Aggregate principal amount		$ 350,000,000
Interest percentage		2.95%		2.95%		2.95%
2.950% Fixed Senior Notes due April 1, 2025 [Member] | Oncor [Member]
Debt Instrument [Line Items]
Aggregate principal amount				$ 350,000,000
2.150% Fixed Senior Notes Due June 1, 2019 [Member]
Debt Instrument [Line Items]
Aggregate principal amount			$ 250,000,000
Interest percentage			2.15%	2.15%	[1]	2.15%	[1]
Proceeds from sale of Notes			$ 248,000,000
Redeemable percentage of principal amount plus accrued and unpaid interest				100.00%
2.150% Fixed Senior Notes Due June 1, 2019 [Member] | Oncor [Member]
Debt Instrument [Line Items]
Aggregate principal amount	[1]			$ 250,000,000		$ 250,000,000
4.550% Fixed Senior Notes Due December 1, 2041 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]			4.55%		4.55%
4.550% Fixed Senior Notes Due December 1, 2041 [Member] | Oncor [Member]
Debt Instrument [Line Items]
Aggregate principal amount	[1]			$ 400,000,000		$ 400,000,000
3.750% Fixed Senior Notes due April 1, 2045 [Member]
Debt Instrument [Line Items]
Aggregate principal amount		$ 375,000,000
Interest percentage		3.75%		3.75%		3.75%
3.750% Fixed Senior Notes due April 1, 2045 [Member] | Oncor [Member]
Debt Instrument [Line Items]
Aggregate principal amount				$ 375,000,000
2025 Notes And 2045 Notes [Member]
Debt Instrument [Line Items]
Redeemable percentage of principal amount plus accrued, unpaid interest, and make-whole premium				100.00%
Redeemable percentage of principal amount plus accrued and unpaid interest				100.00%
[1]	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.

Long-Term Debt (Schedule Of Lon

Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Mar. 31, 2015	Dec. 31, 2014		May. 31, 2014
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs		$ (54)
Total long-term debt, less amounts due currently		$ 5,646			$ 4,964
6.375% Fixed Senior Notes Due January 15, 2015 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	6.375%			6.375%
Due date	[1]	Jan. 15, 2015
5.000% Fixed Senior Notes Due September 30, 2017 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	5.00%			5.00%
Due date	[1]	Sep. 30, 2017
6.800% Fixed Senior Notes Due September 1, 2018 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	6.80%			6.80%
Due date	[1]	Sep. 1, 2018
2.150% Fixed Senior Notes Due June 1, 2019 [Member]
Debt Instrument [Line Items]
Fixed Senior Note							$ 250
Interest percentage		2.15%	[1]		2.15%	[1]	2.15%
Due date	[1]	Jun. 1, 2019
5.750% Fixed Senior Notes Due September 30, 2020 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	5.75%			5.75%
Due date	[1]	Sep. 30, 2020
4.100% Fixed Senior Notes Due June 1, 2022 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	4.10%			4.10%
Due date	[1]	Jun. 1, 2022
7.000% Fixed Debentures Due September 1, 2022 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	7.00%			7.00%
Due date	[1]	Sep. 1, 2022
2.950% Fixed Senior Notes due April 1, 2025 [Member]
Debt Instrument [Line Items]
Fixed Senior Note				$ 350
Interest percentage		2.95%		2.95%	2.95%
Due date		Apr. 1, 2025
7.000% Fixed Senior Notes Due May 1, 2032 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	7.00%			7.00%
Due date	[1]	May 1, 2032
7.250% Fixed Senior Notes Due January 15, 2033 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	7.25%			7.25%
Due date	[1]	Jan. 15, 2033
7.500% Fixed Senior Notes Due September 1, 2038 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	7.50%			7.50%
Due date	[1]	Sep. 1, 2038
5.250% Fixed Senior Notes Due September 30, 2040 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	5.25%			5.25%
Due date	[1]	Sep. 30, 2040
4.550% Fixed Senior Notes Due December 1, 2041 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	4.55%			4.55%
Due date	[1]	Dec. 1, 2041
5.300% Fixed Senior Notes Due June 1, 2042 [Member]
Debt Instrument [Line Items]
Interest percentage	[1]	5.30%			5.30%
Due date	[1]	Jun. 1, 2042
3.750% Fixed Senior Notes due April 1, 2045 [Member]
Debt Instrument [Line Items]
Fixed Senior Note				$ 375
Interest percentage		3.75%		3.75%	3.75%
Due date		Apr. 1, 2045
Oncor [Member]
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	[1]	$ (54)			$ (51)
Less amount due currently	[1]				(500)
Total long-term debt, less amounts due currently	[1]	5,646			4,924
Oncor [Member] | 6.375% Fixed Senior Notes Due January 15, 2015 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]				500
Oncor [Member] | 5.000% Fixed Senior Notes Due September 30, 2017 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	324			324
Oncor [Member] | 6.800% Fixed Senior Notes Due September 1, 2018 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	550			550
Oncor [Member] | 2.150% Fixed Senior Notes Due June 1, 2019 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	250			250
Oncor [Member] | 5.750% Fixed Senior Notes Due September 30, 2020 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	126			126
Oncor [Member] | 4.100% Fixed Senior Notes Due June 1, 2022 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	400			400
Oncor [Member] | 7.000% Fixed Debentures Due September 1, 2022 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	800			800
Oncor [Member] | 2.950% Fixed Senior Notes due April 1, 2025 [Member]
Debt Instrument [Line Items]
Fixed Senior Note		350
Oncor [Member] | 7.000% Fixed Senior Notes Due May 1, 2032 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	500			500
Oncor [Member] | 7.250% Fixed Senior Notes Due January 15, 2033 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	350			350
Oncor [Member] | 7.500% Fixed Senior Notes Due September 1, 2038 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	300			300
Oncor [Member] | 5.250% Fixed Senior Notes Due September 30, 2040 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	475			475
Oncor [Member] | 4.550% Fixed Senior Notes Due December 1, 2041 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	400			400
Oncor [Member] | 5.300% Fixed Senior Notes Due June 1, 2042 [Member]
Debt Instrument [Line Items]
Fixed Senior Note	[1]	500			500
Oncor [Member] | 3.750% Fixed Senior Notes due April 1, 2045 [Member]
Debt Instrument [Line Items]
Fixed Senior Note		375
Bondco [Member]
Debt Instrument [Line Items]
Debt issuance costs	[2]				(1)
Fixed Bonds	[2]	41			179
Less amount due currently	[2]	$ (41)			(139)
Total long-term debt, less amounts due currently	[2]				40
Bondco [Member] | 5.420% Fixed Series 2003 Bonds Due Through August 15, 2015 [Member]
Debt Instrument [Line Items]
Fixed Bonds	[2]				$ 54
Interest percentage	[2]	5.42%			5.42%
Due date	[2]	Aug. 15, 2015
Bondco [Member] | 5.290% Fixed Series 2004 Bonds Due Through May 15, 2016 [Member]
Debt Instrument [Line Items]
Fixed Bonds	[2]	$ 41			$ 126
Interest percentage	[2]	5.29%			5.29%
Due date	[2]	May 15, 2016
[1]	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.
[2]	The transition bonds are nonrecourse to Oncor and were issued to securitize a regulatory asset.

Long-Term Debt (Schedule Of L44

Long-Term Debt (Schedule Of Long-Term Debt Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Long-Term Debt [Abstract]
2,016	$ 41
2,017	324
2,018	550
2,019	250
2,020	126
Thereafter	4,450
Unamortized discount and debt issuance costs	(54)
Total	$ 5,687	$ 5,603

Commitments And Contingencies45

Commitments And Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies [Abstract]
Rent expenses	$ 8	$ 9	$ 10
Required efficiency spending amount	$ 61
Percentage of full time employees represented by labor union	19.00%
Expiration date of collective bargaining agreement	Oct. 25, 2017

Commitments And Contingencies46

Commitments And Contingencies (Schedule Of Future Miinimum Lease Payments Under Operating Leases) (Details) $ in Millions	Dec. 31, 2015USD ($)
Commitments and Contingencies [Abstract]
2,016	$ 9
2,017	1
2,018	1
2,019	1
Total future minimum lease payments	$ 12

Membership Interests (Narrative

Membership Interests (Narrative) (Details) - USD ($) $ in Millions	Feb. 24, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Membership Interests [Abstract]
Declaration of cash distribution to members	$ 56	$ 436	$ 282	$ 310
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		$ 30

Membership Interests (Schedule

Membership Interests (Schedule Of Distributions Paid) (Details) - USD ($) $ in Millions	Feb. 24, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends Payable [Line Items]
Amount	$ 56	$ 436	$ 282	$ 310
Payment Five FY 2015 [Member]
Dividends Payable [Line Items]
Declaration Date		Dec. 9, 2015
Payment Date		Dec. 11, 2015
Amount		$ 18
Payment Four FY 2015 [Member]
Dividends Payable [Line Items]
Declaration Date		Oct. 27, 2015
Payment Date		Nov. 9, 2015
Amount		$ 135
Payment Three FY 2015 [Member]
Dividends Payable [Line Items]
Declaration Date		Jul. 29, 2015
Payment Date		Aug. 10, 2015
Amount		$ 118
Payment Two FY 2015 [Member]
Dividends Payable [Line Items]
Declaration Date		Apr. 29, 2015
Payment Date		May 15, 2015
Amount		$ 65
Payment One FY 2015 [Member]
Dividends Payable [Line Items]
Declaration Date		Feb. 25, 2015
Payment Date		Feb. 26, 2015
Amount		$ 100
Payment Four FY 2014 [Member]
Dividends Payable [Line Items]
Declaration Date			Oct. 21, 2014
Payment Date			Oct. 22, 2014
Amount			$ 101
Payment Three FY 2014 [Member]
Dividends Payable [Line Items]
Declaration Date			Jul. 30, 2014
Payment Date			Jul. 31, 2014
Amount			$ 71
Payment Two FY 2014 [Member]
Dividends Payable [Line Items]
Declaration Date			Apr. 30, 2014
Payment Date			May 1, 2014
Amount			$ 57
Payment One FY 2014 [Member]
Dividends Payable [Line Items]
Declaration Date			Feb. 19, 2014
Payment Date			Feb. 20, 2014
Amount			$ 53

Membership Interests (Schedul49

Membership Interests (Schedule Of Changes To Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (107)	$ (48)	$ (31)
Balance at end of period	(113)	(107)	(48)
Cash Flow Hedges - Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(24)	(26)	(28)
Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges	2	2	2
Balance at end of period	(22)	(24)	(26)
Defined Benefit Pension and OPEB Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(83)	(22)	(3)
Defined benefit pension plans (net of tax)	(8)	(61)	(19)
Balance at end of period	(91)	(83)	(22)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(107)	(48)	(31)
Defined benefit pension plans (net of tax)	(8)	(61)	(19)
Amounts reclassified from accumulated other comprehensive income (loss) and reported in interest expense and related charges	2	2	2
Balance at end of period	$ (113)	$ (107)	$ (48)

Pension And Other Postretirem50

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)item	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Defined Benefit Plan Disclosure [Line Items]
Regulatory assets	$ 1,958	$ 2,023
Earning period	3 years
Rolling period	4 years
Percentage of gains and losses	25.00%
Number of managed investment pools | item	2
Second pool representation of total investments, percentage	32.00%
Oncor Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of corporate bonds | item	1,150
Pension And OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Regulatory assets	$ 1,182	1,166
EFH Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Unfunded liability	$ 90
Number of corporate bonds | item	434
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial loss	$ 41
Amortization of prior service costs	1
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial loss	(63)	(39)	$ (69)
Expected funding, 2016	4
Expected funding, 2016 to 2020	441
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial loss	35
Amortization of prior service costs	20
Expected funding, 2016	30
Expected funding, 2016 to 2020	$ 152
Oncor Cash Balance Formula Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of employee's contribution match by employer	100.00%
Percentage of employee's contribution matched 100% by employer	6.00%
Oncor Traditional Retirement Plan Formula Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of employee's contribution match by employer	75.00%
Percentage of employee's contribution matched 100% by employer	6.00%
Thrift Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Participant contributions	$ 14	$ 13	$ 13

Pension And Other Postretirem51

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Schedule Of Net Pension And OPEB Plan Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	$ 157	$ 106	$ 132
Less amounts deferred principally as property or a regulatory asset	(113)	(69)	(95)
Net amounts recognized as expense	44	37	37
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	104	58	95
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	$ 53	$ 48	$ 37

Pension And Other Postretirem52

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Detailed Information Regarding Periodic Pension And OPEB Benefits) (Details) - USD ($) $ in Millions		6 Months Ended		12 Months Ended
		Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assumptions Used to Determine Net Periodic Pension and OPEB Costs:
Discount rate		4.39%	4.98%
Components of Net Pension and OPEB Costs:
Net periodic pension and OPEB costs				$ 157	$ 106	$ 132
Pension Plan [Member]
Assumptions Used to Determine Net Periodic Pension and OPEB Costs:
Discount rate	[1]			3.96%	4.74%	4.10%
Expected return on plan assets				5.26%	6.47%	6.14%
Rate of compensation increase				3.29%	3.94%	3.94%
Components of Net Pension and OPEB Costs:
Service cost				$ 25	$ 23	$ 26
Interest cost				131	132	122
Expected return on assets				(115)	(136)	(123)
Amortization of net loss				63	39	69
Settlement charges						1
Net periodic pension and OPEB costs				104	58	95
Other Changes in Plan Assets and Benefit Obligations Recognized as Regulatory Assets or in Other Comprehensive Income:
Net loss (gain)				37	388	(139)
Amortization of net loss				(63)	(39)	(69)
Settlement charges						(1)
Total recognized as regulatory assets or other comprehensive income				(26)	349	(209)
Total recognized in net periodic pension and OPEB costs and as regulatory assets or other comprehensive income				$ 78	$ 407	$ (114)
OPEB [Member]
Assumptions Used to Determine Net Periodic Pension and OPEB Costs:
Discount rate	[1]			4.23%	4.98%	4.10%
Expected return on plan assets				6.65%	7.05%	6.70%
Components of Net Pension and OPEB Costs:
Service cost				$ 7	$ 6	$ 6
Interest cost				43	44	36
Expected return on assets				(10)	(12)	(11)
Amortization of prior service cost (credit)				(20)	(20)	(20)
Amortization of net loss				33	30	26
Net periodic pension and OPEB costs				53	48	37
Other Changes in Plan Assets and Benefit Obligations Recognized as Regulatory Assets or in Other Comprehensive Income:
Net loss (gain)				39	128
Amortization of net loss				(33)	(30)	(26)
Amortization of prior service (costs) credit				20	20	20
Total recognized as regulatory assets or other comprehensive income				26	118	(6)
Total recognized in net periodic pension and OPEB costs and as regulatory assets or other comprehensive income				$ 79	$ 166	$ 31
[1]	As a result of the transfer of OPEB plan assets and liabilities from the EFH OPEB Plan to the Oncor OPEB Plan discussed above, the discount rate reflected in OPEB costs for January through June 2014 was 4.98% and for July through December 2014 was 4.39%.

Pension And Other Postretirem53

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Assumptions Used To Determine Benefit Obligations) (Details)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.30%	3.96%	4.74%
Rate of compensation increase	3.29%	3.29%	3.94%
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%	4.23%	4.98%

Pension And Other Postretirem54

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Change In Project Benefit Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation at beginning of year	$ 3,379	$ 2,857
Service cost	25	23	$ 26
Interest cost	131	132	122
Actuarial (gain) loss	(181)	515
Benefits paid	(153)	(148)
Projected benefit obligation at end of year	3,201	3,379	2,857
Accumulated benefit obligation at end of year	3,100	3,260
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation at beginning of year	1,054	924
Service cost	7	6	6
Interest cost	43	44	36
Participant contributions	15	15
Actuarial (gain) loss	25	128
Benefits paid	(56)	(63)
Projected benefit obligation at end of year	$ 1,088	$ 1,054	$ 924

Pension And Other Postretirem55

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Change In Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 79	$ 86	$ 20
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets at beginning of year	2,454	2,271
Actual return (loss) on assets	(103)	263
Employer contributions	54	68	9
Benefits paid	153	148
Fair value of assets at end of year	2,252	2,454	2,271
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets at beginning of year	161	179
Actual return (loss) on assets	(4)	12
Employer contributions	25	18	11
Participant contributions	15	15
Benefits paid	56	63
Fair value of assets at end of year	$ 141	$ 161	$ 179

Pension And Other Postretirem56

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Funded Status) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation at end of year	$ (3,201)	$ (3,379)	$ (2,857)
Fair value of assets at end of year	2,252	2,454	2,271
Funded status at end of year	(949)	(925)
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation at end of year	(1,088)	(1,054)	(924)
Fair value of assets at end of year	141	161	$ 179
Funded status at end of year	$ (947)	$ (893)

Pension And Other Postretirem57

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Amounts Recognized In Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive net loss	$ (113)	$ (107)	$ (48)	$ (31)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other current liabilities	(4)	(4)
Other noncurrent liabilities	(945)	(921)
Net liability recognized	(949)	(925)
Net loss	583	619
Net regulatory asset recognized	583	619
Accumulated other comprehensive net loss	136	126
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Other noncurrent liabilities	(947)	(893)
Net liability recognized	(947)	(893)
Net loss	320	316
Prior service cost (credit)	(50)	(70)
Net regulatory asset recognized	270	246
Accumulated other comprehensive net loss	$ 4	$ 2

Pension And Other Postretirem58

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Schedule Of Assumed Health Care Cost Trend Rates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Effect on accumulated postretirement obligation, 1-Percentage Point Increase	$ 152
Effect on accumulated postretirement obligation, 1-Percentage Point Decrease		$ (125)
Effect on postretirement benefits cost, 1-Percentage Point Increase	$ 8
Effect on postretirement benefits cost, 1-Percentage Point Decrease		$ (7)
Not Medicare Eligible [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year	6.00%	8.00%
Rate to which the cost trend is expected to decline (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2,024	2,022
Medicare Eligible [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year	5.80%	6.50%
Rate to which the cost trend is expected to decline (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2,024	2,021

Pension And Other Postretirem59

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Schedule Of Projected Benefit Obligations And Accumulated Benefit Obligations In Excess Of Plan Assets Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Pension And Other Postretirement Employee Benefits (OPEB) Plans [Abstract]
Projected benefit obligations	$ 3,035	$ 3,379
Accumulated benefit obligations	2,944	3,260
Plan assets	$ 2,085	$ 2,454

Pension And Other Postretirem60

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Schedule Of Target Asset Allocation Ranges By Asset Category) (Details)	12 Months Ended
	Dec. 31, 2015
US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, Recoverable, Minimum	17.00%
Target asset allocation, Recoverable, Maximum	21.00%
Target asset allocation, Nonrecoverable, Minimum	6.00%
Target asset allocation, Nonrecoverable, Maximum	10.00%
International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, Recoverable, Minimum	14.00%
Target asset allocation, Recoverable, Maximum	18.00%
Target asset allocation, Nonrecoverable, Minimum	5.00%
Target asset allocation, Nonrecoverable, Maximum	9.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, Recoverable, Minimum	48.00%
Target asset allocation, Recoverable, Maximum	60.00%
Target asset allocation, Nonrecoverable, Minimum	76.00%
Target asset allocation, Nonrecoverable, Maximum	84.00%
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, Recoverable, Minimum	4.00%
Target asset allocation, Recoverable, Maximum	5.00%
Credit Strategies [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation, Recoverable, Minimum	6.00%
Target asset allocation, Recoverable, Maximum	8.00%
Target asset allocation, Nonrecoverable, Minimum	4.00%
Target asset allocation, Nonrecoverable, Maximum	6.00%

Pension And Other Postretirem61

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Schedule Of Assets Fair Value Measured On Recurring Basis) (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		$ 2,252	$ 2,454	$ 2,271
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		141	161	$ 179
US Equity Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		294	318
US Equity Securities [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		43	58
International Equity Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		268	293
International Equity Securities [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		25	31
Corporate Bond Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	[1]	1,137	1,384
Corporate Bond Securities [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	[1]	30	31
US Treasuries [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		189	143
US Treasuries [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		1	1
Other [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	[2]	145	157
Other [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	[2]	36	35
Real Estate [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		86	39
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		456	514
Fair Value, Inputs, Level 1 [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		103	121
Fair Value, Inputs, Level 1 [Member] | US Equity Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		201	233
Fair Value, Inputs, Level 1 [Member] | US Equity Securities [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		39	54
Fair Value, Inputs, Level 1 [Member] | International Equity Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		255	281
Fair Value, Inputs, Level 1 [Member] | International Equity Securities [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		25	31
Fair Value, Inputs, Level 1 [Member] | Other [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	[2]	35	34
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		1,791	1,932
Fair Value, Inputs, Level 2 [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		38	40
Fair Value, Inputs, Level 2 [Member] | US Equity Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		93	85
Fair Value, Inputs, Level 2 [Member] | US Equity Securities [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		4	4
Fair Value, Inputs, Level 2 [Member] | International Equity Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		13	12
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	[1]	1,137	1,384
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	[1]	30	31
Fair Value, Inputs, Level 2 [Member] | US Treasuries [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		189	143
Fair Value, Inputs, Level 2 [Member] | US Treasuries [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		1	1
Fair Value, Inputs, Level 2 [Member] | Other [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	[2]	145	157
Fair Value, Inputs, Level 2 [Member] | Other [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets	[2]	1	1
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		81	31
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		5	8
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		5	8
Interest-bearing Cash [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		133	120
Interest-bearing Cash [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		6	5
Interest-bearing Cash [Member] | Fair Value, Inputs, Level 1 [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		4	2
Interest-bearing Cash [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		133	120
Interest-bearing Cash [Member] | Fair Value, Inputs, Level 2 [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets		$ 2	$ 3
[1]	Substantially all corporate bonds are rated investment grade by a major ratings agency such as Moody's.
[2]	Other consists primarily of municipal bonds, emerging market debt, bank loans and fixed income derivative instruments.

Pension And Other Postretirem62

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Schedule Of Expected Long-Term Rate Of Return On Assets Assumptions) (Details)	12 Months Ended
	Dec. 31, 2015
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	5.83%	[1]
Pension Plan [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	7.45%
Pension Plan [Member] | US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	6.64%
Pension Plan [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	5.70%
Pension Plan [Member] | Credit Strategies [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	5.70%
Pension Plan [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	4.80%
Pension Plan [Member] | Oncor Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	4.97%
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	6.30%
OPEB [Member] | 401(h) Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	6.93%
OPEB [Member] | Life Insurance VEBA [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	6.16%
OPEB [Member] | Union VEBA [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	6.16%
OPEB [Member] | Non-union VEBA [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average expected long-term rate of return	2.50%
[1]	The 2016 expected long-term rate of return for the nonregulated portion of the Oncor Retirement Plan is 4.97%.

Pension And Other Postretirem63

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Schedule Of Contributions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Total contributions	$ 79	$ 86	$ 20
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total contributions	54	68	9
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total contributions	$ 25	$ 18	$ 11

Pension And Other Postretirem64

Pension And Other Postretirement Employee Benefits (OPEB) Plans (Schedule Of Estimated Future Benefit Payments) (Details) $ in Millions	Dec. 31, 2015USD ($)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2,016	$ 167
2,017	171
2,018	177
2,019	182
2,020	188
2021-25	1,006
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
2,016	49
2,017	52
2,018	54
2,019	57
2,020	60
2021-25	$ 334

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise payments			$ 4
Employees And Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	0
SARs Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend accrual compensation expense	$ 10
SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized dividend accretion and interest	$ 1	$ 1	$ 2

Related-Party Transactions (Nar

Related-Party Transactions (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2015
Related Party Transaction [Line Items]
Administrative and services costs			$ 17	$ 32	$ 30
Shared facilities expense			4	4	4
Revenue from related party			955	971	967
Delivery fee surcharges			17	17	16
Trade payables related parties		$ 12	12
TCEH [Member]
Related Party Transaction [Line Items]
Electricity delivery fees			955	971	967
Letter of credit		6	6	9
EFH Corp [Member]
Related Party Transaction [Line Items]
Revenue from related party			2	$ 2	$ 2
Reimbursement payment amount	$ 1
Sponsor Group [Member]
Related Party Transaction [Line Items]
Cash payments to vendors		128
Trade payables related parties		$ 3	$ 3
Equity in existing vendor						16.60%

Related-Party Transactions (Sch

Related-Party Transactions (Schedule Of Accounts Receivable From Related Party) (Details) - EFH Corp [Member] - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Trade accounts and other receivables from affiliates	$ 120	$ 123
Trade accounts and other payables to affiliates	(2)	(5)
Trade accounts and other receivables from affiliates - net	$ 118	$ 118

Related-Party Transactions (Amo

Related-Party Transactions (Amounts Payable To (Receivable From) Members In Lieu Of Income Taxes) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Federal income taxes receivable	$ (136)	$ (180)
Texas margin taxes payable	20	24
Net payable (receivable)	(116)	(156)
EFH Corp [Member]
Related Party Transaction [Line Items]
Federal income taxes receivable	(109)	(144)
Texas margin taxes payable	20	24
Net payable (receivable)	(89)	(120)
Texas Transmission Investment LLC [Member]
Related Party Transaction [Line Items]
Federal income taxes receivable	(27)	(36)
Net payable (receivable)	$ (27)	$ (36)

Related-Party Transactions (Cas

Related-Party Transactions (Cash Payments Made To (Received From) Members In Lieu Of Income Taxes) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Federal income taxes	[1]	$ 135	$ 269	$ 89
Texas margin taxes	[2]	24	22	12
Total payments (receipts)		159	291	101
EFH Corp [Member]
Related Party Transaction [Line Items]
Federal income taxes	[1]	108	215	78
Texas margin taxes	[2]	24	22	12
Total payments (receipts)		132	237	90
Income tax payments to members				33
Income tax refunds from members				10
Texas Transmission Investment LLC [Member]
Related Party Transaction [Line Items]
Federal income taxes	[1]	27	54	11
Total payments (receipts)		$ 27	$ 54	$ 11
[1]	Includes $33 million payment made to EFH Corp. in 2013 related to the 1997-2002 IRS appeals settlement.
[2]	Includes $10 million refund received from EFH Corp. in 2013 related to 1997-2001 amended Texas franchise tax returns.

Supplementary Financial Infor70

Supplementary Financial Information (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended			24 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Supplemental Financial Information [Line Items]
Face value of life insurance policies	$ 155	$ 167		$ 155
Net cash surrender values	$ 76	$ 76		76
Depreciation expense as percentage of average depreciable property	3.60%	3.60%	3.70%
Aggregate amortization expenses	$ 64	$ 58	$ 53
Goodwill	$ 4,064	$ 4,064		4,064
Bondco [Member]
Supplemental Financial Information [Line Items]
Financial support to related party				$ 0
Sales [Member] | TCEH [Member]
Supplemental Financial Information [Line Items]
Concentration risk percentage	25.00%	25.00%	27.00%
Sales [Member] | Nonaffiliated REP [Member]
Supplemental Financial Information [Line Items]
Concentration risk percentage	17.00%	16.00%	15.00%
Nonaffiliated Trade Accounts Receivable [Member] | Nonaffiliated REP [Member]
Supplemental Financial Information [Line Items]
Concentration risk percentage	13.00%	12.00%
Land Easements [Member]
Supplemental Financial Information [Line Items]
Weighted average remaining useful life	84 years
Capitalized Software [Member]
Supplemental Financial Information [Line Items]
Weighted average remaining useful life	3 years
Bondco Exposure [Member]
Supplemental Financial Information [Line Items]
Exposure amount	$ 14	$ 16

Supplementary Financial Infor71

Supplementary Financial Information (Schedule Of Other Income And Deductions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplementary Financial Information [Abstract]
Accretion of fair value adjustment (discount) to regulatory assets due to purchase accounting	$ 5	$ 12	$ 17
Net gain on sale of other properties and investments	1	1	1
Total other income	6	13	18
Professional fees	19	14	10
Non-recoverable pension (Note 10) and other	9	1	5
Total other deductions	$ 28	$ 15	$ 15

Supplementary Financial Infor72

Supplementary Financial Information (Schedule Of Interest Expense And Related Charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplementary Financial Information [Abstract]
Interest expense	$ 335	$ 355	$ 360
Amortization of debt issuance costs and discounts	3	3	21
Allowance for funds used during construction - capitalized interest portion	(5)	(5)	(10)
Total interest expense and related charges	$ 333	$ 353	$ 371

Supplementary Financial Infor73

Supplementary Financial Information (Schedule Of Restricted Cash) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash - Current Assets	$ 38	$ 56
Total restricted cash - Noncurrent Assets		16
Customer Collections Related To Transition Bonds Used Only To Service Debt And Pay Expenses[Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash - Current Assets	22	56
Reserve For Fees Associated With Transition Bonds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash - Current Assets	10
Total restricted cash - Noncurrent Assets		10
Reserve For Shortfalls Of Transition Bond Charges [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash - Current Assets	$ 6
Total restricted cash - Noncurrent Assets		$ 6

Supplementary Financial Infor74

Supplementary Financial Information (Schedule Of Trade Accounts Receivable) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Supplementary Financial Information [Abstract]
Gross trade accounts and other receivables	$ 509	$ 528
Trade accounts and other receivables from TCEH	118	118
Allowance for uncollectible accounts	(3)	(3)
Trade accounts receivable from nonaffiliates - net	$ 388	$ 407

Supplementary Financial Infor75

Supplementary Financial Information (Summary of Investment Balance) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
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 Infor76

Supplementary Financial Information (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property Plant and Equipment [Line Items]
Total assets in service	$ 19,072	$ 18,238
Less accumulated depreciation	6,479	6,125
Net of accumulated depreciation	12,593	12,113
Construction work in progress	416	335
Held for future use	15	15
Property, plant and equipment - net	13,024	12,463
Distribution [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 10,861	$ 10,423
Composite depreciation rate	4.10%	4.10%
Avg. life	24 years 8 months 12 days	24 years 8 months 12 days
Transmission [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 7,209	$ 6,861
Composite depreciation rate	2.80%	2.80%
Avg. life	35 years 6 months	35 years 6 months
Other Assets [Member]
Property Plant and Equipment [Line Items]
Total assets in service	$ 1,002	$ 954
Composite depreciation rate	9.00%	9.00%
Avg. life	11 years 1 month 6 days	11 years 1 month 6 days

Supplementary Financial Infor77

Supplementary Financial Information (Schedule Of Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 902	$ 896
Accumulated Amortization	360	328
Net	542	568
Land Easements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	467	463
Accumulated Amortization	91	86
Net	376	377
Capitalized Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	435	433
Accumulated Amortization	269	242
Net	$ 166	$ 191

Supplementary Financial Infor78

Supplementary Financial Information (Schedule Of Estimated Aggregate Amortization Expenses) (Details) $ in Millions	Dec. 31, 2015USD ($)
Supplementary Financial Information [Abstract]
2,016	$ 60
2,017	51
2,018	46
2,019	43
2,020	$ 42

Supplementary Financial Infor79

Supplementary Financial Information (Schedule Of Employee Benefit Obligations And Other) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Supplementary Financial Information [Abstract]
Retirement plans and other employee benefits	$ 1,985	$ 1,894
Uncertain tax positions (including accrued interest)	3	2
Amounts payable related to income taxes		17
Investment tax credits	15	17
Other	60	59
Total other noncurrent liabilities and deferred credits	$ 2,063	$ 1,989

Supplementary Financial Infor80

Supplementary Financial Information (Schedule Of Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplementary Financial Information [Abstract]
Interest		$ 346	$ 356	$ 361
Capitalized interest		(5)	(5)	(10)
Interest (net of amounts capitalized)		341	351	351
Federal		135	269	89
State		43	22	12
Total amount in lieu of income taxes		178	291	101
SARs exercise				4
Noncash construction expenditures	[1]	$ 56	$ 82	$ 84
[1]	Represents end-of-period accruals.

Supplementary Financial Infor81

Supplementary Financial Information (Schedule Of Quarterly Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplementary Financial Information [Abstract]
Operating revenues	$ 922	$ 1,072	$ 938	$ 946	$ 939	$ 1,054	$ 912	$ 917	$ 3,878	$ 3,822	$ 3,552
Operating income	160	253	186	180	179	247	183	191	779	800	798
Net income	$ 73	$ 163	$ 98	$ 98	$ 94	$ 158	$ 94	$ 104	$ 432	$ 450	$ 432