Energy Future (TXU) 10-Q 7 May 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2015	7-May-15
Document And Entity Information [Abstract]
Entity Registrant Name	Energy Future Holdings Corp /TX/
Entity Central Index Key	1023291
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		1,669,861,379

Condensed_Statements_Of_Consol

Condensed Statements Of Consolidated Income (Loss) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating revenues	$1,272	$1,517
Fuel, purchased power costs and delivery fees	-613	-732
Net gain (loss) from commodity hedging and trading activities	103	-219
Operating costs	-193	-214
Depreciation and amortization	-218	-330
Selling, general and administrative expenses	-179	-218
Impairment of goodwill	-700	0
Impairment of long-lived assets	-676	0
Other income	8	9
Other deductions	-60	0
Interest income	0	1
Interest expense and related charges	-609	-863
Reorganization Items	-138	0
Loss before income taxes and equity in earnings of unconsolidated subsidiaries	-2,003	-1,049
Income tax benefit (Note 5)	401	360
Equity in earnings of unconsolidated subsidiaries (net of tax) (Note 3)	75	80
Net loss	($1,527)	($609)

Condensed_Statements_Of_Consol1

Condensed Statements Of Consolidated Comprehensive Income (Loss) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net loss	($1,527)	($609)
Other comprehensive income (loss), net of tax effects:
Effects related to pension and other retirement benefit obligations (net of tax benefit of $— and $1)	-2	-1
Cash flow hedges derivative value net loss related to hedged transactions recognized during the period (net of tax benefit of $— in all periods)	1	0
Net effects related to Oncor — reported in equity in earnings of unconsolidated subsidiaries (net of tax benefit of $— in all periods)	1	0
Total other comprehensive income (loss)	0	-1
Comprehensive loss	($1,527)	($610)

Condensed_Statements_Of_Consol2

Condensed Statements Of Consolidated Comprehensive Income (Loss) (Parenthetical) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Effects related to pension and other retirement benefit obligations, tax benefit	$0	$1
Cash flow hedges derivative value net loss related to hedged transactions recognized during the period, tax benefit	0	0
Net effects related to Oncor — reported in equity in earnings of unconsolidated subsidiaries, tax benefit	$0	$0

Condensed_Statements_Of_Consol3

Condensed Statements Of Consolidated Cash Flows (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows — operating activities:
Net loss	($1,527)	($609)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	254	371
Deferred income tax benefit, net	-339	-310
Impairment of goodwill (Note 4)	700	0
Impairment of long-lived assets (Note 6)	676	0
Contract rejection claims (Note 8)	32	0
Fees paid on EFIH Second Lien Notes repayment (Note 10) (reported as financing activities)	28	0
Unrealized net (gain) loss from mark-to-market valuations of commodity positions	-102	250
Unrealized net (gain) from mark-to-market valuations of interest rate swaps (Note 7)	0	-65
Interest expense on toggle notes payable in additional principal (Note 7)	0	49
Amortization of debt related costs, discounts, fair value discounts and losses on dedesignated cash flow hedges (Note 7)	0	55
Equity in earnings of unconsolidated subsidiaries	-75	-80
Distributions of earnings from unconsolidated subsidiaries	74	37
Impairment of intangible assets (Note 4)	59	0
Other, net	18	16
Changes in operating assets and liabilities:
Margin deposits, net	79	-127
Accrued interest	-3	210
Other operating assets and liabilities, including liabilities subject to compromise	-281	-228
Cash used in operating activities	-407	-431
Cash flows — financing activities:
Repayments/repurchases of debt (Notes 9 and 10)	-454	-191
Fees paid on EFIH Second Lien Notes repayment (Note 10)	-28	0
Other, net	-1	1
Cash used in financing activities	-483	-190
Cash flows — investing activities:
Capital expenditures	-121	-119
Nuclear fuel purchases	-5	-26
Changes in restricted cash	28	285
Proceeds from sales of nuclear decommissioning trust fund securities	23	33
Investments in nuclear decommissioning trust fund securities	-27	-37
Other, net	1	1
Cash provided by (used in) investing activities	-101	137
Net change in cash and cash equivalents	-991	-484
Cash and cash equivalents — beginning balance	3,428	1,217
Cash and cash equivalents — ending balance	$2,437	$733

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$2,437	$3,428
Restricted cash (Note 17)	6	6
Trade accounts receivable — net (Note 17)	539	589
Inventories (Note 17)	470	468
Commodity and other derivative contractual assets (Note 14)	466	492
Other current assets	88	100
Total current assets	4,006	5,083
Restricted cash (Note 17)	873	901
Receivable from unconsolidated subsidiary (Note 15)	47	47
Investment in unconsolidated subsidiary (Note 3)	6,060	6,058
Other investments (Note 17)	1,007	995
Property, plant and equipment — net (Note 17)	11,590	12,397
Goodwill (Note 4)	1,652	2,352
Identifiable intangible assets — net (Note 4)	1,199	1,315
Commodity and other derivative contractual assets (Note 14)	18	5
Other noncurrent assets	96	95
Total assets	26,548	29,248
Current liabilities:
Long-term debt due currently (Note 9)	36	39
Trade accounts payable	304	406
Net payables due to unconsolidated subsidiary (Note 15)	178	237
Commodity and other derivative contractual liabilities (Note 14)	202	316
Margin deposits related to commodity derivatives	97	26
Accumulated deferred income taxes	136	135
Accrued taxes	94	157
Accrued interest (Notes 7 and 10)	115	119
Other current liabilities	292	360
Total current liabilities	1,454	1,795
Borrowings under debtor-in-possession credit facilities (Note 9)	6,825	6,825
Long-term debt, less amounts due currently (Note 9)	121	128
Liabilities subject to compromise (Note 10)	36,935	37,432
Commodity and other derivative contractual liabilities (Note 14)	2	1
Accumulated deferred income taxes	362	713
Other noncurrent liabilities and deferred credits (Note 17)	2,099	2,077
Total liabilities	47,798	48,971
Commitments and Contingencies (Note 11)
Shareholders' equity (Note 12)	-21,250	-19,723
Total liabilities and equity	$26,548	$29,248

Business_And_Significant_Accou

Business And Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Business And Significant Accounting Policies	BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES
	Description of Business
	References in this report to "we," "our," "us" and "the Company" are to EFH Corp. and/or its subsidiaries, as apparent in the context. See Glossary for defined terms.
	EFH Corp., a Texas corporation, is a Dallas-based holding company that conducts its operations principally through its TCEH and Oncor subsidiaries. EFH Corp. is a subsidiary of Texas Holdings, which is controlled by the Sponsor Group. TCEH is a holding company for subsidiaries engaged in competitive electricity market activities largely in Texas, including electricity generation, wholesale energy sales and purchases, commodity risk management and trading activities, and retail electricity operations. TCEH is a wholly owned subsidiary of EFCH, which is a holding company and a wholly owned subsidiary of EFH Corp. Oncor is engaged in regulated electricity transmission and distribution operations in Texas. Oncor provides distribution services to REPs, including subsidiaries of TCEH, which sell electricity to residential, business and other consumers. Oncor Holdings, a holding company that holds an approximate 80% equity interest in Oncor, is a wholly owned subsidiary of EFIH, which is a holding company and a wholly owned subsidiary of EFH Corp. Oncor Holdings and its subsidiaries (the Oncor Ring-Fenced Entities) are not consolidated in EFH Corp.'s financial statements in accordance with consolidation accounting standards related to variable interest entities (VIEs) (see Note 3).
	Various ring-fencing measures have been taken to enhance the credit quality of Oncor. Such measures include, among other things: the sale in November 2008 of a 19.75% equity interest in Oncor to Texas Transmission Investment LLC (a limited liability company that owns a 19.75% equity interest in Oncor and is not affiliated with EFH Corp., any of EFH Corp.'s subsidiaries or any member of the Sponsor Group); maintenance of separate books and records for the Oncor Ring-Fenced Entities; Oncor's 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, 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. Moreover, Oncor's operations are conducted, and its cash flows managed, independently from the Texas Holdings Group.
	Consistent with the ring-fencing measures discussed above, the assets and liabilities of the Oncor Ring-Fenced Entities have not been, and are not expected to be, substantively consolidated with the assets and liabilities of the Debtors in the Chapter 11 Cases.
	We have two reportable segments: the Competitive Electric segment, consisting largely of TCEH, and the Regulated Delivery segment, consisting largely of our investment in Oncor. See Note 16 for further information concerning reportable business segments.
	Bankruptcy Filing
	On April 29, 2014 (the Petition Date), EFH Corp. and the substantial majority of its direct and indirect subsidiaries, including EFIH, EFCH and TCEH but excluding the Oncor Ring-Fenced Entities (collectively, the Debtors), filed voluntary petitions for relief (the Bankruptcy Filing) under Chapter 11 of the United States Bankruptcy Code (the Bankruptcy Code) in the United States Bankruptcy Court for the District of Delaware (the Bankruptcy Court). On April 14, 2015, the Debtors filed with the Bankruptcy Court the Plan of Reorganization and the Disclosure Statement. See Note 2 for further discussion regarding the Chapter 11 Cases and our recent filing of the Plan of Reorganization and the Disclosure Statement.
	Basis of Presentation, Including Application of Bankruptcy Accounting
	The condensed consolidated financial statements have been prepared in accordance with US GAAP. The condensed consolidated financial statements have been prepared as if EFH Corp. is a going concern and contemplate the realization of assets and liabilities in the normal course of business. The condensed consolidated financial statements reflect the application of Financial Accounting Standards Board Accounting Standards Codification (ASC) 852, Reorganizations. During the pendency of the Chapter 11 Cases, the Debtors will operate their businesses as debtors-in-possession under the jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code. ASC 852 applies to entities that have filed a petition for bankruptcy under Chapter 11 of the Bankruptcy Code. The guidance requires that transactions and events directly associated with the reorganization be distinguished from the ongoing operations of the business. In addition, the guidance provides for changes in the accounting and presentation of liabilities. See Notes 8 and 10 for discussion of these accounting and reporting changes.
	Investments in unconsolidated subsidiaries, which are 50% or less owned and/or do not meet accounting standards criteria for consolidation, are accounted for under the equity method (see Note 3). Adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the results of operations and financial position have been included therein. All intercompany items and transactions have been eliminated in consolidation. Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with US GAAP have been omitted pursuant to the rules and regulations of the SEC. Because the condensed consolidated interim financial statements do not include all of the information and footnotes required by US GAAP, they should be read in conjunction with the audited financial statements and related notes included in our 2014 Form 10-K. The results of operations for an interim period may not give a true indication of results for a full year. All dollar amounts in the financial statements and tables in the notes are stated in millions of US dollars unless otherwise indicated.
	Use of Estimates
	Preparation of financial statements requires 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 and estimates of expected allowed claims. 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.
	Changes in Accounting Standards
	In April 2014, the FASB issued ASU No. 2014-08, Presentation of Financial Statements (Topic 205) and Property Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which changes the requirements for reporting discontinued operations. The ASU states that a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has or will have a major effect on an entity's operations and financial results when the component of an entity or group of components of an entity meets the criteria to be classified as held for sale, is disposed of by sale, or is disposed of other than by sale. The amendments in this ASU also require additional disclosures about discontinued operations. ASU 2014-08 is effective for the Company for the first quarter of 2015. This new requirement is relevant to our presentation of the equity method investment in Oncor, which has been proposed for sale within the Chapter 11 Cases. The new guidance eliminated a scope exception previously applicable to equity method investments, resulting in the requirement of further analysis of the presentation of the Oncor equity method investment. Based on our analysis, ASU 2014-08 will not materially affect our results of operations, financial position, or cash flows, until a plan of sale of the Oncor investment is approved by the Bankruptcy Court, at which time presentation as discontinued operations may be appropriate.
	In February 2015 the FASB issued Accounting Standards Update 2015-02 (ASU 2015-02) Amendments to the Consolidation Analysis. The ASU is effective for annual reporting periods, including interim reporting periods within those periods, beginning after December 15, 2015. Early adoption is permitted. The new consolidation standard changes the criteria a reporting enterprise uses to evaluate if certain legal entities, such as limited partnerships and similar entities, should be consolidated. We are in the process of assessing the effects of the application of the new guidance on our financial statements.
	In April 2015 the FASB issued Accounting Standards Update 2015-03 (ASU 2015-03) Simplifying Balance Sheet Presentation by Presenting Debt Issuance Costs as a Deduction from Recognized Debt Liability. The ASU is effective for annual reporting periods, including interim reporting periods within those periods, beginning after December 15, 2015. Early adoption is permitted. The new standard requires debt issuance costs to be classified as reductions to the face value of the related debt. We do not expect ASU 2015-03 to materially affect our financial position until we issue new debt. During the Chapter 11 Cases, debt issuance costs on prepetition debt subject to compromise will continue to be reported in liabilities subject to compromise.

Chapter_11_Cases

Chapter 11 Cases	3 Months Ended
	Mar. 31, 2015
Reorganizations [Abstract]
Chapter 11 Cases	CHAPTER 11 CASES
	On the Petition Date, EFH Corp. and the substantial majority of its direct and indirect subsidiaries, including EFIH, EFCH and TCEH but excluding the Oncor Ring-Fenced Entities, filed voluntary petitions for relief under Chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the District of Delaware. During the pendency of the Chapter 11 Cases, the Debtors will operate their businesses as "debtors-in-possession" under the jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code.
	The Bankruptcy Filing resulted primarily from the adverse effects on EFH Corp.'s competitive businesses of lower wholesale electricity prices in ERCOT driven by the sustained decline in natural gas prices since mid-2008. Further, the natural gas hedges that TCEH entered into when forward market prices of natural gas were significantly higher than current prices had largely matured before the remaining positions were terminated shortly after the Bankruptcy Filing. These market conditions challenged the profitability and operating cash flows of EFH Corp.'s competitive businesses and resulted in the inability to support their significant interest payments and debt maturities, including the remaining debt obligations due in 2014, and the inability to refinance and/or extend the maturities of their outstanding debt.
	Proposed Plan of Reorganization
	A Chapter 11 plan of reorganization, among other things, determines the rights and satisfaction of claims of various creditors and security holders of an entity operating under the protection of the Bankruptcy Court and is subject to the ultimate outcome of stakeholder negotiations and Bankruptcy Court decisions ongoing through the date on which the Chapter 11 plan is confirmed. In order for the Debtors to emerge successfully from the Chapter 11 Cases as reorganized companies, they must obtain approval from the Bankruptcy Court and certain of their respective creditors for a Chapter 11 plan of reorganization. The Debtors currently have the exclusive right to file a Chapter 11 plan of reorganization in the Chapter 11 Cases until June 23, 2015 and the exclusive right to solicit the appropriate votes for any such plan it files prior to such date until August 23, 2015 (i.e. collectively, the exclusivity period).
	On April 14, 2015, the Debtors filed with the Bankruptcy Court the Plan of Reorganization and the Disclosure Statement. In general, the Plan of Reorganization proposes a structure that involves a tax-free deconsolidation or tax-free spin-off of TCEH from EFH Corp. (Reorganized TCEH) and the reorganization of EFH Corp. and EFIH either (a) as contemplated by the Debtors' previously disclosed Bankruptcy Court approved bidding procedures with respect to the potential sale of EFH Corp.'s indirect economic interest in Oncor, (b) pursuant to a standalone plan of reorganization or (c) pursuant to a creditor back-stopped plan of reorganization. Pursuant to the Plan of Reorganization, among other things, holders of TCEH first lien secured claims would receive 100% of the common stock of Reorganized TCEH and 100% of the proceeds of new debt issued by Reorganized TCEH. Also, pursuant to the Plan of Reorganization, the Debtors would select the highest or otherwise best transaction to maximize value for reorganized EFH Corp. and EFIH.
	The Plan of Reorganization is subject to revision in response to creditor and/or stakeholder claims and objections and the requirements of the Bankruptcy Code and/or the Bankruptcy Court. Unless the Plan of Reorganization receives the requisite approval from holders of claims and the Bankruptcy Court, upon expiration of the exclusivity period (unless extended by the Bankruptcy Court), any creditor or stakeholder would have the ability to file in the Chapter 11 Cases one or more Chapter 11 plans of reorganization.
	The Disclosure Statement contains, among other things, detailed information about the Plan of Reorganization, a historical profile of our businesses, a description of proposed distributions to creditors under the Plan of Reorganization, and an analysis of the Plan of Reorganization's feasibility, as well as many of the technical matters required for the Debtors to exit from bankruptcy, such as descriptions of who will be eligible to vote on the Plan of Reorganization and the voting process itself. The information contained in the Disclosure Statement is subject to change, for a number of reasons, including amendments to the Plan of Reorganization, actions of third parties, including the Bankruptcy Court, or otherwise.
	Nothing contained in this quarterly report on Form 10-Q is intended to be, nor should it be construed as, a solicitation for a vote on the Plan of Reorganization, as filed or as it may be amended. The Plan of Reorganization will become effective only if it receives the requisite approval and is confirmed by the Bankruptcy Court and the conditions to consummation set forth therein are satisfied. There can be no assurance that the Bankruptcy Court will approve the Disclosure Statement, that the Debtors' stakeholders will approve the Plan of Reorganization, that the Bankruptcy Court will confirm the Plan of Reorganization or that the conditions to consummation of the Plan of Reorganization will be satisfied.
	Proposed Sale of EFH Corp.'s Indirect Economic Ownership Interest in Oncor
	In September 2014, the Debtors filed a motion with the Bankruptcy Court seeking the entry of an order approving bidding procedures with respect to the potential sale of EFH Corp.'s indirect economic ownership interest in Oncor. In January 2015, the Bankruptcy Court approved the Debtors' bidding procedures motion that sets forth the process by which the Debtors are authorized to solicit proposals (i.e., bids) from third parties to acquire (in any form and employing any structure, whether taxable (in whole or in part) or tax-free) EFH Corp.'s indirect economic ownership interest in Oncor in accordance with the Bankruptcy Code. These bidding procedures contemplate that the Debtors select a stalking horse bid after a two-stage closed bidding process, and, after approval by the Bankruptcy Court of such stalking horse bid, the Debtors conduct a round of open bidding culminating in an auction intended to obtain a higher or otherwise best bid for a transaction. Initial bids were received in early March 2015 and second round bids were received in April 2015, and each of the Debtors is currently assessing those submissions. We cannot predict the outcome of this process, including whether we will receive any acceptable bid, whether the Bankruptcy Court will approve any such bid or whether any such transaction will (or when it will) ultimately close because any such transaction would be the subject of customary closing conditions, including receipt of all applicable regulatory approvals.
	Scheduling Matters
	The Debtors filed a proposed scheduling order with respect to the Disclosure Statement and the Plan of Reorganization on April 14, 2015. On May 4, 2015, the Bankruptcy Court indicated that it would approve (a) the Debtors' request to hold a hearing on the Disclosure Statement on July 20, 2015 (and related discovery protocols) and (b) mediation between the Debtors and certain TCEH stakeholders with respect to Plan of Reorganization issues that affect the TCEH Debtors' estates. The Bankruptcy Court is expected to hold a scheduling conference on June 25, 2015 to address a Plan of Reorganization confirmation timeline (and related confirmation discovery protocols). The Disclosure Statement timeline set forth in the proposed scheduling order is subject to revision by the Bankruptcy Court, and may change based on subsequent orders entered by the Bankruptcy Court (on its own, upon the motion of a party, or upon the Debtors' request). There is no guarantee that mediation will be successful.
	Tax Matters
	In June 2014, EFH Corp. filed a request with the IRS for a private letter ruling (Private Letter Ruling) that, among other things, will provide (a) that (i) the transfer by TCEH of all of its assets and its ordinary course operating liabilities to reorganized TCEH completed through a tax-free spin (in accordance with the Private Letter Ruling) in connection with TCEH's emergence from bankruptcy (Reorganized TCEH), (ii) the transfer by the Debtors to Reorganized TCEH of certain assets and liabilities that are reasonably necessary to the operation of Reorganized TCEH and (iii) the distribution by TCEH of (A) the equity it holds in Reorganized TCEH and (B) the cash proceeds TCEH receives from Reorganized TCEH to the holders of TCEH first lien claims, will qualify as a reorganization within the meaning of Sections 368(a)(1)(G), 355 and 356 of the Code and (b) for certain other rulings under Sections 368(a)(1)(G) and 355 of the Code. The Debtors intend to continue to pursue the Private Letter Ruling to support the Plan of Reorganization and other potential Chapter 11 plans of reorganization that could ultimately be proposed. In October 2014, the Debtors filed a memorandum with the Bankruptcy Court that described tax related matters regarding restructuring alternatives.
	Implications of the Chapter 11 Cases
	Our ability to continue as a going concern is contingent upon, among other factors, our ability to comply with the financial and other covenants contained in the DIP Facilities described in Note 9, our ability to obtain new debtor in possession financing in the event the DIP Facilities were to expire during the pendency of the Chapter 11 Cases and our ability to complete a Chapter 11 plan of reorganization in a timely manner, including obtaining creditor and Bankruptcy Court approval of such plan as well as applicable regulatory approvals required for such plan and obtaining any exit financing needed to implement such plan. These circumstances and uncertainties inherent in the bankruptcy proceedings raise substantial doubt about our ability to continue as a going concern.
	Operations During the Chapter 11 Cases
	In general, the Debtors have received final bankruptcy court orders with respect to first day motions and other operating motions that allow the Debtors to operate their businesses in the ordinary course, including, among others, providing for the payment of certain pre-petition employee and retiree expenses and benefits, the use of the Debtors' existing cash management system, the continuation of customer contracts and programs at our retail electricity operations, the payment of certain pre-petition amounts to certain critical vendors, the ability to perform under certain pre-petition hedging and trading arrangements and the ability to pay certain pre-petition taxes and regulatory fees. In addition, the Bankruptcy Court has issued orders approving the DIP Facilities discussed in Note 9.
	Pursuant to the Bankruptcy Code, the Debtors intend to comply with all applicable regulatory requirements, including all requirements related to environmental and safety law compliance, during the pendency of the Chapter 11 Cases. Further, the Debtors have been complying, and intend to continue to comply, with the various reporting obligations that are required by the Bankruptcy Court during the pendency of the Chapter 11 Cases. Moreover, to the extent the Debtors either maintain insurance policies or self-insure their regulatory compliance obligations, the Debtors intend to continue such insurance policies or self-insurance in the ordinary course of business.
	Pre-Petition Claims
	Holders of the substantial majority of pre-petition claims were required to file proofs of claims by the bar date established by the Bankruptcy Court. A bar date is the date by which certain claims against the Debtors must be filed if the claimants wish to receive any distribution in the Chapter 11 Cases. The Bankruptcy Court established a bar date of October 27, 2014 for the substantial majority of claims. We have received approximately 10,000 filed claims since the Petition Date. We are in the process of reconciling those claims to the amounts listed in our schedules of assets and liabilities, which includes communications with claimants to acquire additional information required for reconciliation. As of May 7, 2015, approximately 4,000 of those claims have been settled, withdrawn or expunged. To the extent claims are reconciled and resolved, we have recorded them at the expected allowed amount. Claims that remain unresolved or unreconciled through the filing of this report have been estimated based upon management's best estimate of the likely claim amounts that the Bankruptcy Court will ultimately allow.
	Beginning in November 2014, we began the process to request the Bankruptcy Court to disallow claims that we believe are duplicative, have been later amended or superseded, are without merit, are overstated or should be disallowed for other reasons. Given the substantial number of claims filed, the claims resolution process will take considerable time to complete. Differences between liability amounts recorded by the Debtors as liabilities subject to compromise and claims filed by creditors will be investigated and, if necessary, the Bankruptcy Court will make a final determination of the allowable claim. Differences between those final allowed claims and the liabilities recorded in the consolidated balance sheets will be recognized as reorganization items in our statements of consolidated income (loss) as they are resolved. The determination of how liabilities will ultimately be resolved cannot be made until the Bankruptcy Court approves a plan of reorganization or approves orders related to settlement of specific liabilities. Accordingly, the ultimate amount or resolution of such liabilities is not determinable at this time. The resolution of such claims could result in material adjustments to our financial statements.
	Executory Contracts and Unexpired Leases
	Under the Bankruptcy Code, we have the right to assume, assume and assign, or reject certain executory contracts and unexpired leases, subject to the approval of the Bankruptcy Court and certain other conditions. Generally, the assumption of an executory contract or unexpired lease requires a debtor to satisfy pre-petition obligations under contracts, which may include payment of pre-petition liabilities in whole or in part. Rejection of an executory contract or unexpired lease is typically treated as a breach occurring as of the moment immediately preceding the Chapter 11 filing. Subject to certain exceptions, this rejection relieves the debtor from performing its future obligations under the contract but entitles the counterparty to assert a pre-petition general unsecured claim for damages. Parties to executory contracts or unexpired leases rejected by a debtor may file proofs of claim against that debtor's estate for rejection damages.
	Since the Petition Date, we have renegotiated or rejected a limited number of executory contracts and unexpired leases. For the three months ended March 31, 2015, this activity has resulted in the recognition of approximately $32 million in contract claim adjustment charges recorded in reorganization items as detailed in Note 8.

Variable_Interest_Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 2015
Consolidation Of Variable Interest Entities [Abstract]
Variable Interest Entities	VARIABLE INTEREST ENTITIES
	A variable interest entity (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. Accounting standards require consolidation of 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 (i.e., we are the primary beneficiary of the VIE). In determining the appropriateness of consolidation of a VIE, we evaluate its purpose, governance structure, decision making processes and risks that are passed on to its interest holders. We also examine the nature of any related party relationships among the interest holders of the VIE and the nature of any special rights granted to the interest holders of the VIE.
	Oncor Holdings, an indirect wholly owned subsidiary of EFH Corp. that holds an approximate 80% interest in Oncor, is not consolidated in EFH Corp.'s financial statements, and instead is accounted for as an equity method investment, because the structural and operational ring-fencing measures discussed in Note 1 prevent us from having power to direct the significant activities of Oncor Holdings or Oncor. In accordance with accounting standards, we account for our investment in Oncor Holdings under the equity method, as opposed to the cost method, based on our level of influence over its activities. See below for additional information about our equity method investment in Oncor Holdings. There are no other material investments accounted for under the equity or cost method. The maximum exposure to loss from our interest in Oncor Holdings does not exceed our carrying value.
	Non-Consolidation of Oncor and Oncor Holdings
	Our investment in unconsolidated subsidiary as presented in the condensed consolidated balance sheets totaled $6.060 billion and $6.058 billion at March 31, 2015 and December 31, 2014, respectively, and consists almost entirely of our interest in Oncor Holdings, which we account for under the equity method as described above. Oncor provides services, principally electricity distribution, to TCEH's retail operations, and the related revenues represented 25% and 26% of Oncor Holdings' consolidated operating revenues for the three months ended March 31, 2015 and 2014, respectively.
	See Note 15 for discussion of Oncor Holdings' and Oncor's transactions with EFH Corp. and its other subsidiaries.
	Distributions from Oncor Holdings and Related Considerations — Oncor Holdings' distributions of earnings to us totaled $74 million and $37 million for the three months ended March 31, 2015 and 2014, respectively. Distributions may not be paid except to the extent Oncor maintains a required regulatory capital structure as discussed below. At March 31, 2015, $37 million was eligible to be distributed to Oncor's members after taking into account the regulatory capital structure limit, of which approximately 80% relates to our ownership interest in Oncor. The boards of directors of each of Oncor and Oncor Holdings can withhold distributions to the extent the applicable board determines in good faith that it is necessary to retain such amounts to meet expected future requirements of Oncor and/or Oncor Holdings.
	Oncor's distributions are limited by its regulatory capital structure, which is required to be at or below the assumed debt-to-equity ratio established periodically by the PUCT for ratemaking purposes, which is currently set at 60% debt to 40% equity. At March 31, 2015, Oncor's regulatory capitalization ratio was 59.8% debt and 40.2% equity. 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 bonds issued by Oncor Electric Delivery Transition Bond Company LLC, which were issued in 2003 and 2004 to recover specific generation-related regulatory assets and other qualified costs. Equity is calculated as membership interests determined in accordance with US GAAP, excluding the effects of accounting for the Merger (which included recording the initial goodwill and fair value adjustments and the subsequent related impairments and amortization).
	EFH Corp., Oncor Holdings, Oncor and Oncor's minority investor are parties to a Federal and State Income Tax Allocation Agreement. Additional income tax amounts receivable or payable may arise in the normal course under that agreement.
	Oncor Holdings Financial Statements — Condensed statements of consolidated income of Oncor Holdings and its subsidiaries for the three months ended March 31, 2015 and 2014 are presented below:
		Three Months Ended March 31,
		2015			2014
	Operating revenues	$	946		$	917
	Operation and maintenance expenses	(380		)	(345		)
	Depreciation and amortization	(217		)	(210		)
	Taxes other than income taxes	(111		)	(108		)
	Other income	2			4
	Other deductions	(4		)	(3		)
	Interest income	1			1
	Interest expense and related charges	(81		)	(88		)
	Income before income taxes	156			168
	Income tax expense	(61		)	(67		)
	Net income	95			101
	Net income attributable to noncontrolling interests	(20		)	(21		)
	Net income attributable to Oncor Holdings	$	75		$	80
	Assets and liabilities of Oncor Holdings at March 31, 2015 and December 31, 2014 are presented below:
		March 31,			December 31,
		2015			2014
	ASSETS
	Current assets:
	Cash and cash equivalents	$	18		$	5
	Restricted cash	58			56
	Trade accounts receivable — net	417			407
	Trade accounts and other receivables from affiliates	128			118
	Income taxes receivable from EFH Corp.	80			144
	Inventories	79			73
	Accumulated deferred income taxes	10			10
	Prepayments and other current assets	92			91
	Total current assets	882			904
	Restricted cash	16			16
	Other investments	97			97
	Property, plant and equipment — net	12,626			12,463
	Goodwill	4,064			4,064
	Regulatory assets — net	1,349			1,429
	Other noncurrent assets	71			67
	Total assets	$	19,105		$	19,040
	LIABILITIES
	Current liabilities:
	Short-term borrowings	$	800		$	711
	Long-term debt due currently	109			639
	Trade accounts payable — nonaffiliates	158			202
	Income taxes payable to EFH Corp.	31			24
	Accrued taxes other than income	66			174
	Accrued interest	56			93
	Other current liabilities	117			156
	Total current liabilities	1,337			1,999
	Accumulated deferred income taxes	1,949			1,978
	Long-term debt, less amounts due currently	5,720			4,997
	Other noncurrent liabilities and deferred credits	2,260			2,245
	Total liabilities	$	11,266		$	11,219

Goodwill_And_Identifiable_Inta

Goodwill And Identifiable Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Identifiable Intangible Assets	GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS
	Goodwill
	The following table provides information regarding our goodwill balance, all of which relates to the Competitive Electric segment and arose in connection with accounting for the Merger. None of the goodwill is being deducted for tax purposes.
	Goodwill before impairment charges	$	18,342
	Accumulated noncash impairment charges	(15,990		)
	Balance at December 31, 2014	2,352
	Additional noncash impairment charge in 2015	(700		)
	Balance at March 31, 2015 (a)	$	1,652
	____________
	(a)	Net of accumulated impairment charges totaling $16.69 billion.
	Goodwill Impairments
	Goodwill and intangible assets with indefinite useful lives are required to be tested for impairment at least annually (we have selected a December 1 test date) or whenever events or changes in circumstances indicate an impairment may exist.
	We perform the following steps in testing goodwill for impairment: first, we estimate the debt-free enterprise value of the business as of the testing date taking into account future estimated cash flows and current securities values of comparable companies; second, we estimate the fair values of the individual assets and liabilities of the business at that date; third, we calculate implied goodwill as the excess of the estimated enterprise value over the estimated value of the net operating assets; and finally, we compare the implied goodwill amount to the carrying value of goodwill and, if the carrying amount exceeds the implied value, we record an impairment charge for the amount the carrying value of goodwill exceeds implied goodwill.
	Wholesale electricity prices in the ERCOT market, in which our Competitive Electric segment largely operates, have generally moved with natural gas prices as marginal electricity demand is generally supplied by natural gas fueled generation facilities. Accordingly, the sustained decline in natural gas prices, which we have experienced since mid-2008, negatively impacts our profitability and cash flows and reduces the value of our generation assets, which consist largely of lignite/coal and nuclear fueled facilities. While we had partially mitigated these effects with hedging activities, we are now significantly exposed to this price risk. Because of this market condition, our analyses over the past several years have indicated that the carrying value of the Competitive Electric segment exceeds its estimated fair value (enterprise value). Consequently, we continually monitor trends in natural gas prices, market heat rates, capital spending for environmental and other projects and other operational factors to determine if goodwill impairment testing should be done during the course of a year and not only at the annual December 1 testing date.
	During the three months ended March 31, 2015, we experienced an impairment indicator related to decreases in forward wholesale electricity prices when compared to those prices reflected in our December 1, 2014 goodwill impairment testing analysis. As a result, the likelihood of a goodwill impairment had increased, and we initiated further testing of goodwill as of March 31, 2015. We completed our testing of goodwill for impairment during the period, which resulted in an impairment of $700 million of goodwill at March 31, 2015, which we reported in the Competitive Electric segment results.
	There was no change to the goodwill balance for the three months ended March 31, 2014.
	Key inputs into our goodwill impairment testing at March 31, 2015 and December 1, 2014 were as follows:
	•	The carrying value (excluding debt) of the Competitive Electric segment exceeded its estimated enterprise value by approximately 34% at March 31, 2015 and by 17% at December 1, 2014.
	•	The fair value of the Competitive Electric segment was estimated using a two-thirds weighting of value based on internally developed cash flow projections and a one-third weighting of value using implied cash flow multiples based on current securities values of comparable publicly traded companies. The internally developed cash flow projections reflect annual estimates through a terminal year calculated using a terminal year EBITDA multiple approach.
	•	The discount rates applied to internally developed cash flow projections were 6.00% and 6.25% at March 31, 2015 and December 1, 2014, respectively. The discount rate represents the weighted average cost of capital consistent with our views of the rate that an expected market participant would utilize for valuation, including the risk inherent in future cash flows, taking into account the capital structure, debt ratings and current debt yields of comparable public companies as well as an estimate of return on equity that reflects historical market returns and current market volatility for the industry.
	•	The cash flow projections used in both 2015 and 2014 assume rising wholesale electricity prices, although the forecasted electricity prices are less than those assumed in the cash flow projections used in prior goodwill impairment testing.
	Changes in the above and other assumptions could materially affect the calculated amount of implied goodwill and any resulting goodwill impairment charge.
	The impairment determinations involved significant assumptions and judgments. The calculations supporting the estimates of the fair value of our Competitive Electric segment and the fair values of its assets and liabilities utilized models that take into consideration multiple inputs, including commodity prices, operating parameters, discount rates, capital expenditures, the effects of proposed and final environmental regulations, securities prices of comparable publicly traded companies and other inputs. Assumptions regarding each of these inputs could have a significant effect on the related valuations. In performing these calculations, we also take into consideration assumptions on how current market participants would value the Competitive Electric segment and its operating assets and liabilities. Changes to assumptions that reflect the views of current market participants can also have a significant effect on the related valuations. The fair value measurements resulting from these models are classified as non-recurring Level 3 measurements consistent with accounting standards related to the determination of fair value (see Note 13). Because of the volatility of these factors, we cannot predict the likelihood of any future impairment.
	Identifiable Intangible Assets
	Identifiable intangible assets, including amounts that arose in connection with accounting for the Merger, are comprised of the following:
			March 31, 2015							December 31, 2014
	Identifiable Intangible Asset		Gross			Accumulated		Net		Gross		Accumulated		Net
			Carrying			Amortization				Carrying		Amortization
			Amount							Amount
	Retail customer relationship		$	463		$	429	$	34	$	463	$	425	$	38
	Capitalized in-service software		346			203		143		362		216		146
	Other identifiable intangible assets (a)		68			7		61		460		291		169
	Total identifiable intangible assets subject to amortization		$	877		$	639	238		$	1,285	$	932	353
	Retail trade name (not subject to amortization)							955						955
	Mineral interests (not currently subject to amortization)							6						7
	Total identifiable intangible assets							$	1,199					$	1,315
	____________
	(a)	See discussion below regarding impairment charges recorded in the three months ended March 31, 2015 related to other identifiable intangible assets.
	At March 31, 2015 and December 31, 2014, amounts related to fully amortized assets that are expired, or of no economic value, have been excluded from both the gross carrying and accumulated amortization amounts in the table above.
	Amortization expense related to finite-lived identifiable intangible assets (including the condensed statements of consolidated income (loss) line item) consisted of:
	Identifiable Intangible Asset		Condensed Statement of Consolidated Income (Loss) Line		Segment	Three Months Ended March 31,
						2015		2014
	Retail customer relationship		Depreciation and amortization		Competitive Electric	$	4	$	6
	Capitalized in-service software		Depreciation and amortization		Competitive Electric and Corporate and Other	11		11
	Other identifiable intangible assets		Operating revenues/fuel, purchased power costs and delivery fees/depreciation and amortization		Competitive Electric	5		18
	Total amortization expense (a)					$	20	$	35
	____________
	(a)	Amounts recorded in depreciation and amortization totaled $15 million and $25 million for the three months ended March 31, 2015 and 2014, respectively.
	Intangible Impairments
	During the three months ended March 31, 2015, we determined that certain intangible assets related to favorable power purchase contracts should be evaluated for impairment. That conclusion was based on further declines in wholesale electricity prices in ERCOT experienced during the three months ended March 31, 2015. Our fair value measurement was based on a discounted cash flow analysis of the contracts that compared the contractual price and terms of the contract to forecasted wholesale electricity and renewable energy credit prices in ERCOT. As a result of the analysis, we recorded a noncash impairment charge of $8 million in our Competitive Electric segment (before deferred income tax benefit) in other deductions (see Note 17).
	The impairment of our Big Brown generation facility (see Note 6) resulted in the impairment of the SO2 allowances under the Clean Air Act's acid rain cap-and-trade program that are associated with that facility to the extent they are not projected to be used at other sites. The fair market values of the SO2 allowances were estimated to be de minimis based on Level 3 fair value estimates (see Note 13). Accordingly, in the three months ended March 31, 2015 we recorded a noncash impairment charge of $51 million in our Competitive Electric segment (before deferred income tax benefit) in other deductions related to our existing environmental allowances and credits intangible asset. SO2 emission allowances granted to us were recorded as intangible assets at fair value in connection with purchase accounting related to the Merger in 2007.
	Estimated Amortization of Identifiable Intangible Assets
	The estimated aggregate amortization expense of identifiable intangible assets for each of the next five fiscal years is as follows:
	Year		Estimated Amortization Expense
	2015		$	73
	2016		$	59
	2017		$	46
	2018		$	26
	2019		$	12

Income_Taxes_Notes

Income Taxes (Notes)	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES
	EFH Corp. files a US federal income tax return that includes the results of EFCH, EFIH, Oncor Holdings and TCEH. EFH Corp. is a corporate member of the EFH Corp. consolidated group, while each of EFIH, Oncor Holdings, EFCH and TCEH is classified as a disregarded entity for US federal income tax purposes. Oncor is a partnership for US federal income tax purposes and is not a corporate member of the EFH Corp. consolidated group. Pursuant to applicable US Treasury regulations and published guidance of the IRS, corporations that are members of a consolidated group have joint and several liability for the taxes of such group.
	EFH Corp. and certain of its subsidiaries (including EFCH, EFIH, and TCEH, but not including Oncor Holdings and Oncor) are parties to a Federal and State Income Tax Allocation Agreement, which provides, among other things, that any corporate member or disregarded entity in the EFH Corp. group is required to make payments to EFH Corp. in an amount calculated to approximate the amount of tax liability such entity would have owed if it filed a separate corporate tax return. EFH Corp., Oncor Holdings, Oncor and Oncor's minority investor are parties to a separate Federal and State Income Tax Allocation Agreement, which governs the computation of federal income tax liability among such parties, and similarly provides, among other things, that each of Oncor Holdings and Oncor will pay EFH Corp. its share of an amount calculated to approximate the amount of tax liability such entity would have owed if it filed a separate corporate tax return.
	The calculation of our effective tax rate is as follows:
		Three Months Ended March 31,
		2015			2014
	Loss before income taxes and equity in earnings of unconsolidated subsidiaries	$	(2,003	)	$	(1,049	)
	Income tax benefit	$	401		$	360
	Effective tax rate	20		%	34.3		%
	For the three months ended March 31, 2015, the effective tax rate of 20.0% related to our income tax benefit was lower than the US Federal statutory rate of 35% due primarily to the nondeductible goodwill impairment charge (see Note 4) and nondeductible legal and other professional services costs related to the Chapter 11 Cases, offset by the difference in the forecasted effective tax rate and the statutory rate applied to long-lived and intangible asset impairment charges (see Notes 4 and 6). For the three months ended March 31, 2014, the effective tax rate of 34.3% related to our income tax benefit was slightly lower than the US Federal statutory rate of 35% due primarily to nondeductible expenses related to our debt restructuring activities.

Impairment_of_LongLived_Assets

Impairment of Long-Lived Assets (Notes)	3 Months Ended
	Mar. 31, 2015
Impairment of Long-Lived Assets [Abstract]
Asset Impairment Charges [Text Block]	IMPAIRMENT OF LONG-LIVED ASSETS
	Impairment of Lignite/Coal Fueled Generation and Mining Assets
	We evaluated our generation assets for impairment during March 2015 as a result of an impairment indicator related to lower forecasted wholesale electricity prices in ERCOT. Our evaluation concluded that an impairment existed at our Big Brown generation facility, and the carrying value for that facility and related mining facility was reduced by $676 million. Our fair value measurement for these assets was determined based on an income approach that utilized probability-weighted estimates of discounted future cash flows, which were Level 3 fair value measurements (see Note 13). Key inputs into the fair value measurement for these assets included current forecasted wholesale electricity prices in ERCOT, forecasted fuel prices, capital and operating expenditure forecasts and discount rates.
	Additional material impairments may occur in the future at this or other of our generation facilities if forward wholesale electricity prices continue to decline or forecasted costs of producing electricity at our generation facilities increase.

Interest_Expense_and_Related_C

Interest Expense and Related Charges	3 Months Ended
	Mar. 31, 2015
Interest Expense and Related Charges [Abstract]
Interest Expense and Related Charges	INTEREST EXPENSE AND RELATED CHARGES
		Three Months Ended March 31,
		2015				2014
	Interest paid/accrued on debtor-in-possession financing	$	73			$	—
	Adequate protection amounts paid/accrued (a)	302				—
	Interest paid/accrued on pre-petition debt (b)	237				831
	Interest expense on pre-petition toggle notes payable in additional principal (Note 10)	—				49
	Unrealized mark-to-market net gain on interest rate swaps	—				(65		)
	Amortization of interest rate swap losses at dedesignation of hedge accounting	—				(1		)
	Amortization of fair value debt discounts resulting from purchase accounting	—				5
	Amortization of debt issuance, amendment and extension costs and discounts	—				51
	Capitalized interest	(3		)		(7		)
	Total interest expense and related charges	$	609			$	863
	____________
	(a)	Post-petition period only.
	(b)	For the three months ended March 31, 2015, amounts include $235 million in post-petition interest related to the EFIH Second Lien Notes (see Note 10). Includes amounts related to interest rate swaps totaling zero and $146 million for the three months ended March 31, 2015 and 2014, respectively.
	Interest expense for the three months ended March 31, 2015 reflects interest paid and accrued on debtor-in-possession financing (see Note 9), adequate protection amounts paid and accrued, as approved by the Bankruptcy Court in June 2014 for the benefit of secured creditors of (a) $22.616 billion principal amount of outstanding borrowings from the TCEH Senior Secured Facilities, (b) $1.750 billion principal amount of outstanding TCEH Senior Secured Notes and (c) the $1.235 billion net liability related to the TCEH interest rate swaps and natural gas hedging positions terminated shortly after the Bankruptcy Filing (see Note 14), in exchange for their consent to the senior secured, super-priority liens contained in the TCEH DIP Facility and any diminution in value of their interests in the pre-petition collateral from the Petition Date, and interest paid on EFIH's pre-petition 11.00% Second Lien Notes due 2021 and 11.75% Second Lien Notes due 2022 as approved by the Bankruptcy Court in March 2015 (see Note 10). The interest rate applicable to the adequate protection amounts paid/accrued for the three months ended March 31, 2015 is 4.67% (one-month LIBOR plus 4.50%). In connection with the completion of the Plan of Reorganization, the amount of adequate protection payments may be adjusted to reflect the valuation of the TCEH Debtors determined in connection with confirmation of the Plan of Reorganization by the Bankruptcy Court.
	The Bankruptcy Code generally restricts payment of interest on pre-petition debt, subject to certain exceptions. However, the Bankruptcy Court ordered the payment of adequate protection amounts as discussed above and post-petition interest payments on EFIH First Lien Notes in connection with the settlement in June 2014 as discussed in Note 9. Additionally, the Bankruptcy Court approved post-petition interest payments on the EFIH Second Lien Notes in March 2015 as discussed in Note 10. Additional payments may also be made upon approval by the Bankruptcy Court, at the federal judgment rate (see Note 11). Other than these amounts ordered or approved by the Bankruptcy Court, effective April 29, 2014, we discontinued recording interest expense on outstanding pre-petition debt classified as liabilities subject to compromise (LSTC). The table below shows contractual interest amounts, which are amounts due under the contractual terms of the outstanding debt, including debt subject to compromise during the Chapter 11 Cases. Interest expense reported in the condensed statements of consolidated income (loss) for the three months ended March 31, 2015 does not include $288 million in contractual interest on pre-petition debt classified as LSTC, which has been stayed by the Bankruptcy Court effective on the Petition Date. For the three months ended March 31, 2015, adequate protection paid/accrued presented below excludes $14 million related to interest paid/accrued on the TCEH first-lien interest rate and commodity hedge claims (see Note 14), as such amounts are not included in contractual interest amounts below.
			Three Months Ended March 31, 2015
	Entity:		Contractual Interest on				Adequate Protection		Approved Interest Paid/Accrued (a)		Contractual Interest on
			Debt Classified as LSTC				Paid/Accrued				Debt Classified as LSTC Not
											Paid/Accrued
	EFH Corp.		$	31			$	—	$	—	$	31
	EFIH		111				—		50		61
	EFCH		2				—		—		2
	TCEH		513				288		—		225
	Eliminations (b)		(31		)		—		—		(31		)
	Total		$	626			$	288	$	50	$	288
	___________
	(a)	Represents portion of interest related to the EFIH Second Lien Notes that was repaid based on the approval of the Bankruptcy Court; however, excludes $185 million of post-petition interest paid in the three months ended March 31, 2015 that contractually related to 2014 (see Note 10).
	(b)	Represents contractual interest on affiliate debt held by EFH Corp. and EFIH that is classified as liabilities subject to compromise.

Reorganization_Items

Reorganization Items	3 Months Ended
	Mar. 31, 2015
Reorganization Items [Abstract]
Reorganization Items	REORGANIZATION ITEMS
	Expenses and income directly associated with the Chapter 11 Cases are reported separately in the condensed statements of consolidated income (loss) as reorganization items as required by ASC 852, Reorganizations. Reorganization items also include adjustments to reflect the carrying value of liabilities subject to compromise (LSTC) at their estimated allowed claim amounts, as such adjustments are determined. The following table presents reorganization items incurred in the three months ended March 31, 2015 as reported in the condensed statements of consolidated income (loss):
		Three Months Ended March 31, 2015
	Expenses related to legal advisory and representation services	$	50
	Expenses related to other professional consulting and advisory services	28
	Fees associated with repayment of EFIH Second Lien Notes (Note 10)	28
	Contract claims adjustments	32
	Total reorganization items	$	138

DebtorInPossession_Borrowing_F

Debtor-In-Possession Borrowing Facilities Debtor-In-Possession Borrowing Facilities	3 Months Ended
	Mar. 31, 2015
Debtor-In-Possession Obligations [Abstract]
Debtor-In-Possession Borrowing Facilities	DEBTOR-IN-POSSESSION BORROWING FACILITIES AND LONG-TERM DEBT NOT SUBJECT TO COMPROMISE
	TCEH DIP Facility — The Bankruptcy Court approved the TCEH DIP Facility in June 2014. The TCEH DIP Facility currently provides for up to $3.375 billion in senior secured, super-priority financing consisting of a revolving credit facility of up to $1.95 billion and a term loan facility of up to $1.425 billion. The TCEH DIP Facility is a Senior Secured, Super-Priority Credit Agreement by and among the TCEH Debtors, the lenders that are party thereto from time to time and an administrative and collateral agent.
	The TCEH DIP Facility and related available capacity at March 31, 2015 are presented below. Borrowings are reported in the condensed consolidated balance sheets as borrowings under debtor-in-possession credit facilities.
			March 31, 2015
	TCEH DIP Facility		Facility			Available Cash		Available Letter of Credit Capacity
			Limit			Borrowing Capacity
	TCEH DIP Revolving Credit Facility (a)		$	1,950		$	1,950	$	—
	TCEH DIP Term Loan Facility (b)		1,425			—		433
	Total TCEH DIP Facility		$	3,375		$	1,950	$	433
	___________
	(a)	Facility used for general corporate purposes. No amounts were borrowed at March 31, 2015. Pursuant to an order of the Bankruptcy Court, the TCEH Debtors may not have more than $1.650 billion of TCEH DIP Revolving Credit Facility cash borrowings outstanding without written consent of the TCEH committee of unsecured creditors and the ad hoc group of TCEH unsecured noteholders or further order of the Bankruptcy Court.
	(b)	Facility used for general corporate purposes, including but not limited to, $800 million for issuing letters of credit.
	At both March 31, 2015 and December 31, 2014, all $1.425 billion of the TCEH DIP Term Loan Facility has been borrowed. Of this borrowing, $800 million represents amounts that support issuances of letters of credit and have been funded to a collateral account. Of the collateral account amount at March 31, 2015, $433 million is reported as cash and cash equivalents and $367 million is reported as restricted cash, which represents the amount of outstanding letters of credit.
	Amounts borrowed under the TCEH DIP Facility bear interest based on applicable LIBOR rates, subject to a 0.75% floor, plus 3%. At both March 31, 2015 and December 31, 2014, the interest rate on outstanding borrowings was 3.75%. The TCEH DIP Facility also provides for certain additional fees payable to the agents and lenders, as well as availability fees payable with respect to any unused portions of the available TCEH DIP Facility.
	The TCEH DIP Facility will mature on the earlier of (a) the effective date of any reorganization plan, (b) upon the event of the sale of substantially all of TCEH's assets or (c) May 2016. The maturity date may be extended to no later than November 2016 subject to the satisfaction of certain conditions, including the payment of a 25 basis point extension fee, a requirement that an acceptable plan of reorganization has been filed on or prior to such extension and the availability of certain metrics of liquidity applicable to the TCEH Debtors. In addition, TCEH's existing cash collateral order expires in October 2015. The expiration of the cash collateral order is an event of default under the TCEH DIP Facility. Accordingly, absent an extension of the existing cash collateral order or a new cash collateral order (agreed by the facility's lenders and the Bankruptcy Court), the lenders under the TCEH DIP Facility could accelerate the obligations under the facility.
	The TCEH Debtors' obligations under the TCEH DIP Facility are secured by a lien covering substantially all of the TCEH Debtors' assets, rights and properties, subject to certain exceptions set forth in the TCEH DIP Facility. The TCEH DIP Facility provides that all obligations thereunder constitute administrative expenses in the Chapter 11 Cases, with administrative priority and senior secured status under the Bankruptcy Code and, subject to certain exceptions set forth in the TCEH DIP Facility, have priority over any and all administrative expense claims, unsecured claims and costs and expenses in the Chapter 11 Cases. EFCH is a parent guarantor to the agreement governing the TCEH DIP Facility along with substantially all of TCEH’s subsidiaries, including all subsidiaries that are Debtors in the Chapter 11 Cases.
	The TCEH DIP Facility also permits certain hedging agreements to be secured on a pari-passu basis with the TCEH DIP Facility in the event those hedging agreements meet certain criteria set forth in the TCEH DIP Facility.
	In June 2014, the RCT agreed to accept a collateral bond from TCEH of up to $1.1 billion, as a substitute for its self-bond, to secure mining land reclamation obligations. The collateral bond is a $1.1 billion carve-out from the super-priority liens under the TCEH DIP Facility that will enable the RCT to be paid before the TCEH DIP Facility lenders.
	The TCEH DIP Facility provides for affirmative and negative covenants applicable to the TCEH Debtors, including affirmative covenants requiring the TCEH Debtors to provide financial information, budgets and other information to the agents under the TCEH DIP Facility, and negative covenants restricting the TCEH Debtors' ability to incur additional indebtedness, grant liens, dispose of assets, make investments, pay dividends or take certain other actions, in each case except as permitted in the TCEH DIP Facility. The TCEH Debtors' ability to borrow under the TCEH DIP Facility is subject to the satisfaction of certain customary conditions precedent set forth therein.
	The TCEH DIP Facility provides for certain customary events of default, including events of default resulting from non-payment of principal, interest or other amounts when due, material breaches of representations and warranties, material breaches of covenants in the TCEH DIP Facility or ancillary loan documents, cross-defaults under other agreements or instruments and the entry of material judgments against the TCEH Debtors. The agreement governing the TCEH DIP Facility includes a covenant that requires the Consolidated Superpriority Secured Net Debt to Consolidated EBITDA ratio not exceed 3.50 to 1.00 beginning with the test period ending June 30, 2014. Consolidated Superpriority Secured Net Debt consists of outstanding term loans and revolving credit exposure under the TCEH DIP Facility less unrestricted cash. Upon the existence of an event of default, the TCEH DIP Facility provides that all principal, interest and other amounts due thereunder will become immediately due and payable, either automatically or at the election of specified lenders.
	EFIH DIP Facility, EFIH First Lien Notes Settlement and EFIH Second Lien Notes Repayment — The Bankruptcy Court approved the EFIH DIP Facility in June 2014. The EFIH DIP Facility provides for a $5.4 billion first-lien debtor-in-possession financing facility. Since inception, the facility has been utilized as follows:
	•	In June 2014, $1.836 billion of loans issued under the facility were issued as an exchange to holders of $1.673 billion principal amount of EFIH First Lien Notes plus accrued and unpaid interest totaling $78 million. Holders of substantially all of the principal amount exchanged received as payment in full a principal amount of loans under the DIP facility equal to 105% of the principal amount of the notes held plus 101% of the accrued and unpaid interest at the non-default rate on such principal;
	•	In June 2014, $2.438 billion of cash borrowings were used to repay all remaining $2.312 billion principal amount of EFIH First Lien Notes (plus accrued and unpaid interest totaling $128 million), and
	•	In March 2015, $750 million of cash borrowings were used to repay $445 million principal amount of EFIH Second Lien Notes (including accrued and unpaid pre-petition interest of $55 million and post-petition interest of $235 million) and certain fees (see Note 10).
	As of March 31, 2015, remaining borrowings under the facility, net of fees, along with existing cash on hand, totaled approximately $392 million, which was held as cash and cash equivalents.
	The principal amounts outstanding under the EFIH DIP Facility bear interest based on applicable LIBOR rates, subject to a 1% floor, plus 3.25%. At both March 31, 2015 and December 31, 2014, outstanding borrowings under the EFIH DIP Facility totaled $5.4 billion at an annual interest rate of 4.25%. The EFIH DIP Facility is a non-amortizing loan that may, subject to certain limitations, be voluntarily prepaid by the EFIH Debtors, in whole or in part, without any premium or penalty.
	The EFIH DIP Facility will mature on the earlier of (a) the effective date of any reorganization plan, (b) upon the event of the sale of substantially all of EFIH's assets or (c) June 2016. The maturity date may be extended to no later than December 2016 subject to the satisfaction of certain conditions, including the payment of a 25 basis point extension fee, a requirement that an acceptable plan of reorganization has been filed on or prior to such extension and the availability of certain metrics of liquidity applicable to EFIH and EFIH Finance.
	EFIH's obligations under the EFIH DIP Facility are secured by a first lien covering substantially all of EFIH's assets, rights and properties, subject to certain exceptions set forth in the EFIH DIP Facility. The EFIH DIP Facility provides that all obligations thereunder constitute administrative expenses in the Chapter 11 Cases, with administrative priority and senior secured status under the Bankruptcy Code and, subject to certain exceptions set forth in the EFIH DIP Facility, will have priority over any and all administrative expense claims, unsecured claims and costs and expenses in the Chapter 11 Cases.
	The EFIH DIP Facility provides for affirmative and negative covenants applicable to EFIH and EFIH Finance, including affirmative covenants requiring EFIH and EFIH Finance to provide financial information, budgets and other information to the agents under the EFIH DIP Facility, and negative covenants restricting EFIH's and EFIH Finance's ability to incur additional indebtedness, grant liens, dispose of assets, pay dividends or take certain other actions, in each case except as permitted in the EFIH DIP Facility. The EFIH DIP Facility also includes a minimum liquidity covenant pursuant to which EFIH cannot allow the amount of its unrestricted cash (as defined in the EFIH DIP Facility) to be less than $150 million. As of March 31, 2015, EFIH was in compliance with this minimum liquidity covenant. The Oncor Ring-Fenced Entities are not restricted subsidiaries for purposes of the EFIH DIP Facility.
	The EFIH DIP Facility provides for certain customary events of default, including events of default resulting from non-payment of principal, interest or other amounts when due, material breaches of representations and warranties, material breaches of covenants in the EFIH DIP Facility or ancillary loan documents, cross-defaults under other agreements or instruments and the entry of material judgments against EFIH. Upon the existence of an event of default, the EFIH DIP Facility provides that all principal, interest and other amounts due thereunder will become immediately due and payable, either automatically or at the election of specified lenders.
	The EFIH DIP Facility permits, subject to certain terms, conditions and limitations set forth in the EFIH DIP Facility, EFIH to incur incremental junior lien subordinated debt in an aggregate amount not to exceed $3 billion.
	Long-Term Debt Not Subject to Compromise — Amounts presented in the table below represent pre-petition liabilities that are not subject to compromise due to the debt being fully collateralized or specific orders from the Bankruptcy Court approving repayment of the debt.
		March 31,			December 31,
		2015			2014
	EFH Corp. (parent entity)
	8.82% Non-Debtor Building Financing due semiannually through February 11, 2022	$	38		$	40
	Unamortized fair value premium (a)	7			7
	Total EFH Corp.	45			47
	EFCH
	9.58% Fixed Notes due in annual installments through December 4, 2019 (b)	21			21
	8.254% Fixed Notes due in quarterly installments through December 31, 2021 (b)	27			29
	Unamortized fair value discount (a)	(3		)	(3		)
	Total EFCH	45			47
	TCEH
	7.48% Fixed Secured Facility Bonds with amortizing payments through January 2017 (c)	23			25
	7.46% Fixed Secured Facility Bonds with amortizing payments through January 2015 (c)	—			4
	Capital lease obligations	43			44
	Other	2			2
	Unamortized discount	(1		)	(2		)
	Total TCEH	67			73
	Total EFH Corp. consolidated	157			167
	Less amounts due currently	(36		)	(39		)
	Total long-term debt not subject to compromise	$	121		$	128
	____________
	(a)	Amount represents unamortized fair value adjustments recorded under purchase accounting.
	(b)	Approved by the Bankruptcy Court for repayment.
	(c)	Debt issued by trust and secured by assets held by the trust.

Liabilities_Subject_to_Comprom

Liabilities Subject to Compromise	3 Months Ended
	Mar. 31, 2015
Liabilities Subject to Compromise [Abstract]
Liabilities Subject to Compromise	LIABILITIES SUBJECT TO COMPROMISE
	The amounts classified as liabilities subject to compromise (LSTC) reflect the company's estimate of pre-petition liabilities and other expected allowed claims to be addressed in the Chapter 11 Cases and may be subject to future adjustment as the Chapter 11 Cases proceed. Debt amounts include related unamortized deferred financing costs and discounts/premiums. Amounts classified to LSTC do not include pre-petition liabilities that are fully collateralized by letters of credit or cash deposits. The following table presents LSTC as reported in the condensed consolidated balance sheets at March 31, 2015 and December 31, 2014:
		March 31,			December 31,
		2015			2014
	Notes, loans and other debt per the following table	$	34,679		$	35,124
	Accrued interest on notes, loans and other debt	749			804
	Net liability under terminated TCEH interest rate swap and natural gas hedging agreements (Note 14)	1,235			1,235
	Trade accounts payable and other expected allowed claims	272			269
	Total liabilities subject to compromise	$	36,935		$	37,432
	Pre-Petition Notes, Loans and Other Debt Reported as Liabilities Subject to Compromise
	Amounts presented below represent principal amounts of pre-petition notes, loans and other debt reported as liabilities subject to compromise.
		March 31,			December 31,
		2015			2014
	EFH Corp. (parent entity)
	9.75% Fixed Senior Notes due October 15, 2019	$	2		$	2
	10% Fixed Senior Notes due January 15, 2020	3			3
	10.875% Fixed Senior Notes due November 1, 2017	33			33
	11.25% / 12.00% Senior Toggle Notes due November 1, 2017	27			27
	5.55% Fixed Series P Senior Notes due November 15, 2014 (a)	90			90
	6.50% Fixed Series Q Senior Notes due November 15, 2024 (a)	201			201
	6.55% Fixed Series R Senior Notes due November 15, 2034 (a)	291			291
	Unamortized fair value discount (b)	(118		)	(118		)
	Total EFH Corp.	529			529
	EFIH
	11% Fixed Senior Secured Second Lien Notes due October 1, 2021	322			406
	11.75% Fixed Senior Secured Second Lien Notes due March 1, 2022	1,389			1,750
	11.25% / 12.25% Senior Toggle Notes due December 1, 2018	1,566			1,566
	9.75% Fixed Senior Notes due October 15, 2019	2			2
	Unamortized premium	243			243
	Unamortized discount	(121		)	(121		)
	Total EFIH	3,401			3,846
	EFCH
	Floating Rate Junior Subordinated Debentures, Series D due January 30, 2037	1			1
	8.175% Fixed Junior Subordinated Debentures, Series E due January 30, 2037	8			8
	Unamortized fair value discount (b)	(1		)	(1		)
	Total EFCH	8			8
	TCEH
	Senior Secured Facilities:
	TCEH Floating Rate Term Loan Facilities due October 10, 2014	3,809			3,809
	TCEH Floating Rate Letter of Credit Facility due October 10, 2014	42			42
		March 31,			December 31,
		2015			2014
	TCEH Floating Rate Revolving Credit Facility due October 10, 2016	$	2,054		$	2,054
	TCEH Floating Rate Term Loan Facilities due October 10, 2017 (a)	15,691			15,691
	TCEH Floating Rate Letter of Credit Facility due October 10, 2017	1,020			1,020
	11.5% Fixed Senior Secured Notes due October 1, 2020	1,750			1,750
	15% Fixed Senior Secured Second Lien Notes due April 1, 2021	336			336
	15% Fixed Senior Secured Second Lien Notes due April 1, 2021, Series B	1,235			1,235
	10.25% Fixed Senior Notes due November 1, 2015 (a)	1,833			1,833
	10.25% Fixed Senior Notes due November 1, 2015, Series B (a)	1,292			1,292
	10.50% / 11.25% Senior Toggle Notes due November 1, 2016	1,749			1,749
	Pollution Control Revenue Bonds:
	Brazos River Authority:
	5.40% Fixed Series 1994A due May 1, 2029	39			39
	7.70% Fixed Series 1999A due April 1, 2033	111			111
	7.70% Fixed Series 1999C due March 1, 2032	50			50
	8.25% Fixed Series 2001A due October 1, 2030	71			71
	8.25% Fixed Series 2001D-1 due May 1, 2033	171			171
	6.30% Fixed Series 2003B due July 1, 2032	39			39
	6.75% Fixed Series 2003C due October 1, 2038	52			52
	5.40% Fixed Series 2003D due October 1, 2029	31			31
	5.00% Fixed Series 2006 due March 1, 2041	100			100
	Sabine River Authority of Texas:
	6.45% Fixed Series 2000A due June 1, 2021	51			51
5.20% Fixed Series 2001C due May 1, 2028	70			70
5.80% Fixed Series 2003A due July 1, 2022	12			12
6.15% Fixed Series 2003B due August 1, 2022	45			45
Trinity River Authority of Texas:
6.25% Fixed Series 2000A due May 1, 2028	14			14
Unamortized fair value discount related to pollution control revenue bonds (b)	(103		)	(103		)
Other:
Other	1			1
Unamortized discount	(91		)	(91		)
Total TCEH	31,474			31,474
Deferred debt issuance and extension costs	(733		)	(733		)
Total EFH Corp. consolidated notes, loans and other debt	$	34,679		$	35,124
___________
(a)	Excludes the following principal amounts of debt held by EFIH or EFH Corp. (parent entity) and eliminated in consolidation.
	March 31,			December 31,
	2015			2014
EFH Corp. 5.55% Fixed Series P Senior Notes due November 15, 2014	$	281		$	281
EFH Corp. 6.50% Fixed Series Q Senior Notes due November 15, 2024	545			545
EFH Corp. 6.55% Fixed Series R Senior Notes due November 15, 2034	456			456
TCEH Floating Rate Term Loan Facilities due October 10, 2017	19			19
TCEH 10.25% Fixed Senior Notes due November 1, 2015	213			213
TCEH 10.25% Fixed Senior Notes due November 1, 2015, Series B	150			150
Total	$	1,664		$	1,664
(b)	Amount represents unamortized fair value adjustments recorded under purchase accounting.
Repayment of EFIH Second Lien Notes
In March 2015, with the approval of the Bankruptcy Court, EFIH used some of its cash to repay (Repayment) $735 million, including interest at contractual rates, in amounts outstanding under EFIH's pre-petition 11.00% Fixed Senior Secured Second Lien Notes due October 1, 2021 (11.00% Notes) and 11.75% Fixed Senior Secured Second Lien Notes due March 1, 2022 (11.75% Notes) and $15 million in certain fees and expenses of the trustee for such notes. The Repayment resulted in an $84 million reduction in the principal amount of the 11.00% Notes, a $361 million reduction in the principal amount of the 11.75% Notes and the payment of $235 million and $55 million of accrued and unpaid post-petition and pre-petition interest, respectively, at contractual rates. The Repayment required the requisite consent of the lenders under EFIH's DIP Facility. EFIH received such consent from approximately 97% of the lenders under the EFIH DIP Facility in consideration of an aggregate consent fee equal to approximately $13 million. As a result of the Repayment, as of March 31, 2015, the principal amount outstanding on the 11.00% Notes and 11.75% Notes are $322 million and $1.389 billion, respectively.
TCEH Letter of Credit Facility Activity
Borrowings under the TCEH Letter of Credit Facility have been recorded by TCEH as restricted cash that supports issuances of letters of credit. At March 31, 2015, the restricted cash related to the pre-petition TCEH Letter of Credit Facility totaled $506 million and supported $7 million in outstanding letters of credit. Due to the default under the pre-petition TCEH Senior Secured Facilities, the remaining $499 million letter of credit capacity is no longer available. In the first quarter of 2014, TCEH issued a $157 million letter of credit to a subsidiary of EFH Corp. to secure its current and future amounts payable to the subsidiary arising from recurring transactions in the normal course of business, and in 2014, the subsidiary drew on the letter of credit in the amount of $150 million to settle amounts due from TCEH. The remaining $7 million under the letter of credit expired in July 2014. For the year ended December 31, 2014 and the three months ended March 31, 2015, $245 million and $45 million, respectively, of letters of credit have been drawn upon by counterparties to settle amounts due from TCEH. Included in the three months ended March 31, 2015 amount was $20 million drawn by certain executive officers to satisfy payments related to long-term incentive awards.
Information Regarding Significant Pre-Petition Debt
The TCEH pre-petition debt described below is junior in right of priority and payment to the TCEH DIP Facility, and the EFIH pre-petition debt (including EFIH's guarantee of the EFH Corp. debt) described below is junior in right of priority and payment to the EFIH DIP Facility.
TCEH Senior Secured Facilities — Borrowings under the TCEH Senior Secured Facilities total $22.616 billion and consist of:
•	$3.809 billion of TCEH Term Loan Facilities with interest at LIBOR plus 3.50%;
•	$15.691 billion of TCEH Term Loan Facilities with interest at LIBOR plus 4.50%, excluding $19 million aggregate principal amount held by EFH Corp.;
•	$42 million of cash borrowed under the TCEH Letter of Credit Facility with interest at LIBOR plus 3.50%;
•	$1.020 billion of cash borrowed under the TCEH Letter of Credit Facility with interest at LIBOR plus 4.50%, and
•	Amounts borrowed under the TCEH Revolving Credit Facility, which represent the entire amount of commitments under the facility totaling $2.054 billion.
The TCEH Senior Secured Facilities are fully and unconditionally guaranteed jointly and severally on a senior secured basis by EFCH, and subject to certain exceptions, each existing and future direct or indirect wholly owned US subsidiary of TCEH. The TCEH Senior Secured Facilities, the TCEH Senior Secured Notes and the TCEH first lien hedges (or any termination amounts related thereto), discussed below, are secured on a first priority basis by (i) substantially all of the current and future assets of TCEH and TCEH's subsidiaries who are guarantors of such facilities and (ii) pledges of the capital stock of TCEH and certain current and future direct or indirect subsidiaries of TCEH.
TCEH 11.5% Senior Secured Notes — The principal amount of the TCEH 11.5% Senior Secured Notes totals $1.750 billion, with interest payable at a fixed rate of 11.5% per annum. The notes are fully and unconditionally guaranteed on a joint and several basis by EFCH and each subsidiary of TCEH that guarantees the TCEH Senior Secured Facilities (collectively, the Guarantors). The notes are secured, on a first-priority basis, by security interests in all of the assets of TCEH, and the guarantees are secured on a first-priority basis by all of the assets and equity interests held by the Guarantors, in each case, to the extent such assets and equity interests secure obligations under the TCEH Senior Secured Facilities (the TCEH Collateral), subject to certain exceptions and permitted liens.
The notes are (i) senior obligations and rank equally in right of payment with all senior indebtedness of TCEH, (ii) senior in right of payment to all existing or future unsecured and second-priority secured debt of TCEH to the extent of the value of the TCEH Collateral and (iii) senior in right of payment to any future subordinated debt of TCEH. These notes are effectively subordinated to all secured obligations of TCEH that are secured by assets other than the TCEH Collateral, to the extent of the value of the assets securing such obligations.
The guarantees of the TCEH Senior Secured Notes by the Guarantors are effectively senior to any unsecured and second-priority debt of the Guarantors to the extent of the value of the TCEH Collateral. The guarantees are effectively subordinated to all debt of the Guarantors secured by assets that are not part of the TCEH Collateral, to the extent of the value of the collateral securing that debt.
TCEH 15% Senior Secured Second Lien Notes (including Series B) — The principal amount of the TCEH 15% Senior Secured Second Lien Notes totals $1.571 billion with interest at a fixed rate of 15% per annum. The notes are fully and unconditionally guaranteed on a joint and several basis by EFCH and, subject to certain exceptions, each subsidiary of TCEH that guarantees the TCEH Senior Secured Facilities. The notes are secured, on a second-priority basis, by security interests in all of the assets of TCEH, and the guarantees (other than the guarantee of EFCH) are secured on a second-priority basis by all of the assets and equity interests of all of the Guarantors other than EFCH (collectively, the Subsidiary Guarantors), in each case, to the extent such assets and security interests secure obligations under the TCEH Senior Secured Facilities on a first-priority basis, subject to certain exceptions (including the elimination of the pledge of equity interests of any Subsidiary Guarantor to the extent that separate financial statements would be required to be filed with the SEC for such Subsidiary Guarantor under Rule 3-16 of Regulation S-X) and permitted liens. The guarantee from EFCH is not secured.
The notes are senior obligations of the issuer and rank equally in right of payment with all senior indebtedness of TCEH, are senior in right of payment to all existing or future unsecured debt of TCEH to the extent of the value of the TCEH Collateral (after taking into account any first-priority liens on the TCEH Collateral) and are senior in right of payment to any future subordinated debt of TCEH. These notes are effectively subordinated to TCEH's obligations under the TCEH Senior Secured Facilities, the TCEH Senior Secured Notes and TCEH's commodity and interest rate hedges that are secured by a first-priority lien on the TCEH Collateral and any future obligations subject to first-priority liens on the TCEH Collateral, to the extent of the value of the TCEH Collateral, and to all secured obligations of TCEH that are secured by assets other than the TCEH Collateral, to the extent of the value of the assets securing such obligations.
The guarantees of the TCEH Senior Secured Second Lien Notes by the Subsidiary Guarantors are effectively senior to any unsecured debt of the Subsidiary Guarantors to the extent of the value of the TCEH Collateral (after taking into account any first-priority liens on the TCEH Collateral). These guarantees are effectively subordinated to all debt of the Subsidiary Guarantors secured by the TCEH Collateral on a first-priority basis or that is secured by assets that are not part of the TCEH Collateral, to the extent of the value of the collateral securing that debt. EFCH's guarantee ranks equally with its unsecured debt (including debt it guarantees on an unsecured basis) and is effectively subordinated to any of its secured debt to the extent of the value of the collateral securing that debt.
TCEH 10.25% Senior Notes (including Series B) and 10.50%/11.25% Senior Toggle Notes (collectively, the TCEH Senior Notes) — The principal amount of the TCEH Senior Notes totals $4.874 billion, excluding $363 million aggregate principal amount held by EFH Corp. and EFIH, and the notes are fully and unconditionally guaranteed on a joint and several unsecured basis by TCEH's direct parent, EFCH, and by each subsidiary that guarantees the TCEH Senior Secured Facilities. The TCEH 10.25% Notes bore interest at a fixed rate of 10.25% per annum. The TCEH Toggle Notes bore interest at a fixed rate of 10.50% per annum.
EFIH 6.875% Senior Secured First Lien Notes — There were no principal amounts of the EFIH 6.875% Notes outstanding at March 31, 2015 as the notes were exchanged or settled in June 2014 as discussed in Note 9. The notes bore interest at a fixed rate of 6.875% per annum. The EFIH 6.875% Notes were secured on a first-priority basis by EFIH's pledge of its 100% ownership of the membership interests in Oncor Holdings (the EFIH Collateral) on an equal and ratable basis with the EFIH 10% Notes (discussed below).
EFIH 10% Senior Secured First Lien Notes — There were no principal amounts of the EFIH 10% Notes outstanding at March 31, 2015 as the notes were exchanged or settled in June 2014 as discussed in Note 9. The notes bore interest at a fixed rate of 10% per annum. The notes were secured by the EFIH Collateral on an equal and ratable basis with the EFIH 6.875% Notes.
EFIH 11% Senior Secured Second Lien Notes — The principal amount of the EFIH 11% Notes totals $322 million with interest at a fixed rate of 11% per annum. The EFIH 11% Notes are secured on a second-priority basis by the EFIH Collateral on an equal and ratable basis with the EFIH 11.75% Notes. See discussion above related to the Repayment of a portion of these notes in March 2015.
The EFIH 11% Notes are senior obligations of EFIH and EFIH Finance and rank equally in right of payment with all senior indebtedness of EFIH and are effectively senior in right of payment to all existing or future unsecured debt of EFIH to the extent of the value of the EFIH Collateral. The notes have substantially the same terms as the EFIH 11.75% Notes discussed below, and the holders of the EFIH 11% Notes will generally vote as a single class with the holders of the EFIH 11.75% Notes.
EFIH 11.75% Senior Secured Second Lien Notes — The principal amount of the EFIH 11.75% Notes totals $1.389 billion with interest at a fixed rate of 11.75% per annum. The EFIH 11.75% Notes are secured on a second-priority basis by the EFIH Collateral on an equal and ratable basis with the EFIH 11% Notes. The EFIH 11.75% Notes have substantially the same covenants as the EFIH 11% Notes, and the holders of the EFIH 11.75% Notes will generally vote as a single class with the holders of the EFIH 11% Notes. See discussion above related to the Repayment of a portion of these notes in March 2015.
The EFIH 11.75% Notes were issued in private placements and are not registered under the Securities Act. EFIH had agreed to use its commercially reasonable efforts to register with the SEC notes having substantially identical terms as the EFIH 11.75% Notes (except for provisions relating to transfer restrictions and payment of additional interest) as part of an offer to exchange freely tradable notes for the EFIH 11.75% Notes. Because the exchange offer was not completed, the annual interest rate on the EFIH 11.75% Notes increased by 25 basis points (to 12.00%) in February 2013 and by an additional 25 basis points (to 12.25%) in May 2013.
EFIH 11.25%/12.25% Senior Toggle Notes — The principal amount of the EFIH Toggle Notes totals $1.566 billion with interest at a fixed rate of 11.25% per annum for cash interest and 12.25% per annum for PIK Interest. The terms of the Toggle Notes include an election by EFIH, for any interest period until June 1, 2016, to pay interest on the Toggle Notes (i) entirely in cash; (ii) by increasing the principal amount of the notes or by issuing new EFIH Toggle Notes (PIK Interest); or (iii) 50% in cash and 50% in PIK Interest. EFIH made its pre-petition interest payments on the EFIH Toggle Notes by using the PIK feature of those notes.
The EFIH Toggle Notes were issued in private placements and are not registered under the Securities Act. EFIH had agreed to use its commercially reasonable efforts to register with the SEC notes having substantially identical terms as the EFIH Toggle Notes (except for provisions relating to transfer restrictions and payment of additional interest) as part of an offer to exchange freely tradable notes for the EFIH Toggle Notes. Because the exchange offer was not completed, the annual interest rate on the EFIH Toggle Notes increased by 25 basis points (to 11.50%) in December 2013 and by an additional 25 basis points (to 11.75%) in March 2014.
EFH Corp. 10.875% Senior Notes and 11.25%/12.00% Senior Toggle Notes — The collective principal amount of these notes totals $60 million. The notes are fully and unconditionally guaranteed on a joint and several senior unsecured basis by EFCH and EFIH. The notes bore interest at a fixed rate for the 10.875% Notes of 10.875% per annum and at a fixed rate for the Toggle Notes of 11.25% per annum.
Material Cross Default/Acceleration Provisions — Certain of our pre-petition financing arrangements contain provisions that result in an event of default if there were a failure under other financing arrangements to meet payment terms or to observe other covenants that could or does result in an acceleration of payments due. Such provisions are referred to as "cross default" or "cross acceleration" provisions. The Bankruptcy Filing triggered defaults on our pre-petition debt obligations, but pursuant to the Bankruptcy Code, the creditors are stayed from taking any actions against the Debtors as a result of such defaults.

Commitments_And_Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES
	Guarantees
	We have entered into contracts that contain guarantees to unaffiliated parties that could require performance or payment under certain conditions. Material guarantees are discussed below.
	See Notes 9 and 10 for discussion of guarantees and security for certain of our post-petition and pre-petition debt.
	Letters of Credit
	At March 31, 2015, TCEH had outstanding letters of credit under credit facilities totaling $374 million as follows:
	•	$200 million to support commodity risk management and trading margin requirements in the normal course of business, including over-the-counter hedging transactions and collateral postings with ERCOT;
	•	$80 million to support executory contracts and insurance agreements;
	•	$62 million to support TCEH's REP financial requirements with the PUCT, and
	•	$32 million for other credit support requirements.
	The automatic stay under the Bankruptcy Code does not apply to letters of credit issued under the pre-petition credit facility and third parties may draw if the terms of a particular letter of credit so provide. See Note 10 for discussion of letter of credit draws in 2014 and 2015.
	Litigation
	Aurelius Derivative Claim — Aurelius Capital Master, Ltd. and ACP Master, Ltd. (Aurelius) filed a lawsuit in March 2013, amended in May 2013, in the US District Court for the Northern District of Texas (Dallas Division) against EFCH as a nominal defendant and each of the current directors and a former director of EFCH. In the lawsuit, Aurelius, as a creditor under the TCEH Senior Secured Facilities and certain TCEH secured bonds, both of which are guaranteed by EFCH, filed a derivative claim against EFCH and its directors. Aurelius alleged that the directors of EFCH breached their fiduciary duties to EFCH and its creditors, including Aurelius, by permitting TCEH to make certain loans "without collecting fair and reasonably equivalent value." The lawsuit sought recovery for the benefit of EFCH. In January 2014, the district court granted EFCH's and the directors' motion to dismiss and in February 2014 dismissed the lawsuit. Aurelius has appealed the district court's judgment to the US Court of Appeals for the Fifth Circuit (Fifth Circuit Court). The appeal was automatically stayed as a result of the Bankruptcy Filing. We cannot predict the outcome of this proceeding, including the financial effects, if any.
	Make-whole Claims — In May 2014, the indenture trustee for the EFIH 10% First Lien Notes initiated litigation in the Bankruptcy Court seeking, among other things, a declaratory judgment that EFIH is obligated to pay a make-whole premium in connection with the cash repayment of the EFIH First Lien Notes discussed in Note 9 and that such make-whole premium is an allowed secured claim, or in the alternative, an allowed secured or unsecured claim for breach of contract (EFIH First Lien Make-whole Claims). The indenture trustee has alleged that the EFIH First Lien Make-whole Claims are valued at approximately $432 million plus reimbursement of expenses. The indenture trustee also filed a motion in May 2014 asking the Bankruptcy Court to lift the automatic stay for cause in order to allow the trustee's notice purporting to rescind the automatic acceleration of the EFIH First Lien Notes to take effect. Following argument and briefing on cross motions for summary judgment, in March 2015, the Bankruptcy Court issued a ruling and order in favor of the EFIH Debtors on almost all issues, including denying the indenture trustee's motion for summary judgment in full and granting the EFIH Debtors summary judgment on all but the issue of whether to lift the automatic stay. A trial took place in April 2015. The Bankruptcy Court has not yet issued a ruling on these issues.
	In June 2014, the indenture trustee for the EFIH Second Lien Notes initiated litigation in the Bankruptcy Court seeking similar relief with respect to the EFIH Second Lien Notes, including among other things, that EFIH is obligated to pay a make-whole premium in connection with any repayment of the EFIH Second Lien Notes and that such make-whole premium would be an allowed secured claim, or in the alternative, an allowed secured or unsecured claim for breach of contract (the EFIH Second Lien Make-whole Claims). In the EFIH Second Lien Make-whole Claims, as of March 31, 2015, the amount of such claims alleged would have been equal to approximately $539 million plus reimbursement of expenses. In December 2014, the EFIH Debtors filed counterclaims for relief against the Second Lien indenture trustee, seeking declaratory relief that, among other things, EFIH is not obligated to pay a make-whole premium in connection with any repayment of the EFIH Second Lien Notes and that such make-whole premium, if owing, would not constitute an allowed secured claim (EFIH Second Lien Counterclaims). As a result of EFIH's partial repayment of the EFIH Second Lien Notes, the indenture trustee for the EFIH Second Lien Notes amended its complaint in April 2015. The parties are currently working together on a schedule to propose to the Bankruptcy Court in order to adjudicate this matter.
	In December 2014, the EFIH Debtors initiated litigation against the indenture trustee for the EFIH PIK Notes seeking, among other things, a declaratory judgment that EFIH is not obligated to pay a redemption premium in connection with the cash repayment of the EFIH PIK Notes and that any post-petition interest owing on these notes is to be paid at the statutory Federal Judgment Rate of interest. The indenture trustee for the EFIH PIK Notes filed a motion in February 2015 to dismiss the EFIH Debtors' complaint for declaratory relief, and the EFIH Debtors filed a brief in opposition to that motion in February 2015. If a redemption claim was allowed, as of March 31, 2015, such claims would be approximately $100 million. On May 4, 2015, the Bankruptcy Court heard arguments on the motion to dismiss. The Bankruptcy Court has not yet issued a ruling on this issue.
	In addition, creditors may make additional claims in the Chapter 11 Cases for make-whole or redemption premiums in connection with repayments or settlement of other pre-petition debt. These claims could be material. There can be no assurance regarding the outcome of any of the litigation regarding the validity or, if deemed valid, the amount of these make-whole or redemption claims.
	Potential Inter/Intra Debtor Claims — In August 2014, the Bankruptcy Court entered an order in the Chapter 11 Cases establishing discovery procedures governing, among other things, certain prepetition transactions among the various Debtors' estates. In February 2015, the ad hoc group of TCEH unsecured creditors; the official committee representing unsecured interests at EFCH and its direct subsidiary, TCEH; and the official committee representing unsecured interests at EFH and EFIH filed motions with the Bankruptcy Court seeking standing to prosecute derivative claims on behalf of TCEH relating to certain of these prepetition transactions. These motions are scheduled to be heard at a later date. In addition to the claims described above, certain of the Debtors (or creditors purporting to act derivatively in the name of a Debtor) may bring inter-Debtor or intra-Debtor claims (including claims under the Federal and State Income Tax Allocation Agreement among EFH Corp. and certain of its subsidiaries under which TCEH and EFH Corp. have previously filed claims in the Chapter 11 Cases) that could be material in amount. Creditors who wish to seek derivative standing to prosecute claims on behalf of a Debtor relating to pre-petition transactions addressed by the discovery protocol governing the Debtors' Chapter 11 Cases are currently required to file motions seeking standing by the later of May 29, 2015 and fifteen days after approval of a disclosure statement. We cannot predict the timing or outcome of future proceedings, if any, related to these transactions. The outcome of any of these claims could be material and could affect the results of operation, liquidity or financial condition of a particular Debtor.
	Litigation Related to EPA Reviews — In June 2008, the EPA issued an initial request for information to TCEH under the EPA's authority under Section 114 of the Clean Air Act (CAA). The stated purpose of the request is to obtain information necessary to determine compliance with the CAA, including New Source Review Standards and air permits issued by the TCEQ for the Big Brown, Monticello and Martin Lake generation facilities. In April 2013, we received an additional information request from the EPA under Section 114 related to the Big Brown, Martin Lake and Monticello facilities as well as an initial information request related to the Sandow 4 generation facility.
	In July 2012, the EPA sent us a notice of violation alleging noncompliance with the CAA's New Source Review Standards and the air permits at our Martin Lake and Big Brown generation facilities. In July 2013, the EPA sent us a second notice of violation alleging noncompliance with the CAA's New Source Review Standards at our Martin Lake and Big Brown generation facilities, which the EPA said "superseded" its July 2012 notice. In August 2013, the US Department of Justice, acting as the attorneys for the EPA, filed a civil enforcement lawsuit against Luminant Generation Company LLC and Big Brown Power Company LLC in federal district court in Dallas, alleging violations of the CAA at our Big Brown and Martin Lake generation facilities. We believe that we have complied with all requirements of the CAA and intend to vigorously defend against these allegations. The lawsuit requests the maximum civil penalties available under the CAA to the government of up to $32,500 to $37,500 per day for each alleged violation, depending on the date of the alleged violation, and injunctive relief, including an order requiring the installation of best available control technology at the affected units. An adverse outcome could require substantial capital expenditures that cannot be determined at this time and could possibly require the payment of substantial penalties. We cannot predict the outcome of these proceedings, including the financial effects, if any.
	Cross-State Air Pollution Rule (CSAPR)
	In July 2011, the EPA issued the CSAPR, compliance with which would have required significant additional reductions of sulfur dioxide (SO2) and nitrogen oxide (NOx) emissions from our fossil fueled generation units. In February 2012, the EPA released a final rule (Final Revisions) and a proposed rule revising certain aspects of the CSAPR, including increases in the emissions budgets for Texas and our generation assets as compared to the July 2011 version of the rule. In June 2012, the EPA finalized the proposed rule (Second Revised Rule). As compared to the proposed revisions to the CSAPR issued by the EPA in October 2011, the Final Revisions and the Second Revised Rule finalize emissions budgets for our generation assets that are approximately 6% lower for SO2, 3% higher for annual NOx and 2% higher for seasonal NOx.
	The CSAPR became effective January 1, 2015, but is still subject to further legal challenge before the D.C. Circuit Court on remand from the US Supreme Court. Oral argument took place in February 2015. While we cannot predict the outcome of future proceedings related to the CSAPR, based upon our current operating plans, including Mercury and Air Toxics Standard (MATS) compliance efforts, we do not believe that the CSAPR will cause any material operational, financial or compliance issues.
	State Implementation Plan (SIP)
	In February 2013, in response to a petition for rulemaking filed by the Sierra Club, the EPA proposed a rule requiring certain states to replace SIP exemptions for excess emissions during malfunctions with an affirmative defense. Texas was not included in that original proposal since it already had an EPA-approved affirmative defense provision in its SIP. In 2014, as a result of a D.C. Circuit Court decision striking down an affirmative defense in another EPA rule, the EPA revised its 2013 proposal to extend the EPA's proposed findings of inadequacy to states that have affirmative defense provisions, including Texas. The EPA's revised proposal would require Texas to remove or replace its EPA-approved affirmative defense provisions for excess emissions during startup, shutdown and maintenance events. We filed comments on the EPA proposal in November 2014, and the EPA is expected to finalize the proposal in May 2015. We cannot predict the timing or outcome of future proceedings related to this rulemaking, including the requirements of any ultimately implemented rule, any compliance timeframe, or the financial effects, if any.
	In June 2014, the Sierra Club filed a petition in the D.C. Circuit Court seeking review of several EPA regulations containing affirmative defenses for malfunctions, including the MATS rule for power plants. In the petition, the Sierra Club contends this affirmative defense is no longer permissible in light of a D.C. Circuit Court decision regarding similar defenses applicable to the cement industry. Luminant filed a motion to intervene in this case. In July 2014, the D.C. Circuit Court ordered the case stayed pending the EPA's consideration of a petition for administrative reconsideration of the regulations at issue. In December 2014, the EPA signed a proposal to make technical corrections to the MATS rule. Except as set forth above, we cannot predict the timing or outcome of future proceedings related to this petition, the petition for administrative reconsideration that is pending before the EPA or the financial effects of these proceedings, if any.
	Other Matters
	We are involved in various legal and administrative proceedings in the normal course of business, the ultimate resolutions of which, in the opinion of management, are not anticipated to have a material effect on our results of operations, liquidity or financial condition.

Equity

Equity	3 Months Ended
	Mar. 31, 2015
Stockholders' Equity Note [Abstract]
Equity	EQUITY
	EFH Corp. has not declared or paid any dividends since the Merger.
	The agreement governing the TCEH DIP Facility generally restricts TCEH's ability to make distributions or loans to any of its parent companies or their subsidiaries unless such distributions or loans are expressly permitted under the agreement governing such facility.
	The agreement governing the EFIH DIP Facility generally restricts EFIH's ability to make distributions or loans to any of its parent companies or their subsidiaries unless such distributions or loans are expressly permitted under the agreement governing such facility.
	Under applicable law, we are prohibited from paying any dividend to the extent that immediately following payment of such dividend, there would be no statutory surplus or we would be insolvent. In addition, due to the Chapter 11 Cases, no dividends are eligible to be paid without the approval of the Bankruptcy Court.
	Equity
	The following table presents the changes to equity for the three months ended March 31, 2015:
		EFH Corp. Shareholders’ Equity
		Common Stock (a)			Additional Paid-in Capital			Retained Earnings (Deficit)			Accumulated Other Comprehensive Income (Loss)			Noncontrolling Interests			Total Equity
	Balance at December 31, 2014	$	2		$	7,968		$	(27,563	)	$	(130	)	$	—		$	(19,723	)
	Net loss	—			—			(1,527		)	—			—			(1,527		)
	Change in unrecognized losses related to pension and OPEB plans	—			—			—			(2		)	—			(2		)
	Net effects of cash flow hedges	—			—			—			1			—			1
	Net effects related to Oncor	—			—			—			1			—			1
	Balance at March 31, 2015	$	2		$	7,968		$	(29,090	)	$	(130	)	$	—		$	(21,250	)
	____________
	(a)	Authorized shares totaled 2,000,000,000 at March 31, 2015. Outstanding shares totaled 1,669,861,379 and 1,669,861,379 at March 31, 2015 and December 31, 2014, respectively.
	The following table presents the changes to equity for the three months ended March 31, 2014:
		EFH Corp. Shareholders’ Equity
		Common Stock (a)			Additional Paid-in Capital			Retained Earnings (Deficit)			Accumulated Other Comprehensive Income (Loss)			Noncontrolling Interests			Total Equity
	Balance at December 31, 2013	$	2		$	7,962		$	(21,157	)	$	(63	)	$	1		$	(13,255	)
	Net loss	—			—			(609		)	—			—			(609		)
	Effects of stock-based incentive compensation plans	—			2			—			—			—			2
	Change in unrecognized losses related to pension and OPEB plans	—			—			—			(1		)	—			(1		)
	Investment by noncontrolling interests	—			—			—			—			1			1
	Other	—			—			—			—			(2		)	(2		)
	Balance at March 31, 2014	$	2		$	7,964		$	(21,766	)	$	(64	)	$	—		$	(13,864	)
	____________
	(a)	Authorized shares totaled 2,000,000,000 at March 31, 2014. Outstanding shares totaled 1,669,861,383 and 1,669,861,383 at March 31, 2014 and December 31, 2013, respectively.
	Accumulated Other Comprehensive Income (Loss)
	The following table presents the changes to accumulated other comprehensive income (loss) for the three months ended March 31, 2015. There was no other comprehensive income (loss) before reclassification for the period.
		Dedesignated Cash Flow Hedges – Interest Rate Swaps (Note 14)			Pension and Other Postretirement Employee Benefit Liabilities Adjustments			Accumulated Other Comprehensive Income (Loss)
	Balance at December 31, 2014	$	(53	)	$	(77	)	$	(130	)
	Amounts reclassified from accumulated other comprehensive income (loss) and reported in:
	Operating costs	—			(1		)	(1		)
	Depreciation and amortization	1			—			1
	Selling, general and administrative expenses	—			(1		)	(1		)
	Income tax benefit (expense)	—			—			—
	Equity in earnings of unconsolidated subsidiaries (net of tax)	1			—			1
	Total amount reclassified from accumulated other comprehensive income (loss) during the period	2			(2		)	—
	Balance at March 31, 2015	$	(51	)	$	(79	)	$	(130	)
	The following table presents the changes to accumulated other comprehensive income (loss) for the three months ended March 31, 2014. There was no other comprehensive income (loss) before reclassification for the period.
		Dedesignated Cash Flow Hedges – Interest Rate Swaps (Note 14)			Pension and Other Postretirement Employee Benefit Liabilities Adjustments			Accumulated Other Comprehensive Income (Loss)
	Balance at December 31, 2013	$	(56	)	$	(7	)	$	(63	)
	Amounts reclassified from accumulated other comprehensive income (loss) and reported in:
	Operating costs	—			(1		)	(1		)
	Depreciation and amortization	(1		)	—			(1		)
	Selling, general and administrative expenses	—			(1		)	(1		)
	Interest expense and related charges	1			—			1
	Income tax benefit (expense)	—			1			1
	Total amount reclassified from accumulated other comprehensive income (loss) during the period	—			(1		)	(1		)
	Balance at March 31, 2014	$	(56	)	$	(8	)	$	(64	)

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS
	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 willing 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. Our Level 1 assets and liabilities include exchange-traded commodity contracts. For example, some of our derivatives are NYMEX or ICE futures and swaps transacted through clearing brokers for which prices are actively quoted.
	•	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 mathematical 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. For example, our Level 2 assets and liabilities include forward commodity positions at locations for which over-the-counter broker quotes are available.
	•	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. For example, our Level 3 assets and liabilities include certain derivatives with values derived from pricing models that utilize multiple inputs to the valuations, including inputs that are not observable or easily corroborated through other means. See further discussion below.
	Our valuation policies and procedures are developed, maintained and validated by a centralized risk management group that reports to the Chief Financial Officer, who also functions as the Chief Risk Officer. Risk management functions include commodity price reporting and validation, valuation model validation, risk analytics, risk control, credit risk management and risk reporting.
	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. These methods include, among others, the use of broker quotes and statistical relationships between different price curves.
	In utilizing broker quotes, we attempt to obtain multiple quotes from brokers (generally non-binding) that are active in the commodity markets in which we participate (and require at least one quote from two brokers to determine a pricing input as observable); however, not all pricing inputs are quoted by brokers. The number of broker quotes received for certain pricing inputs varies depending on the depth of the trading market, each individual broker's publication policy, recent trading volume trends and various other factors. In addition, for valuation of interest rate swaps, we used generally accepted interest rate swap valuation models utilizing month-end interest rate curves.
	Probable loss from default by either us or our counterparties is considered in determining the fair value of derivative assets and liabilities. These non-performance risk adjustments take into consideration credit enhancements and the credit risks associated with our credit standing and the credit standing of our counterparties (see Note 14 for additional information regarding credit risk associated with our derivatives). We utilize published credit ratings, default rate factors and debt trading values in calculating these fair value measurement adjustments.
	Certain derivatives and financial instruments are valued utilizing option pricing models that take into consideration multiple inputs including, but not limited to, commodity prices, volatility factors, discount rates and other market based factors. Additionally, when there is not a sufficient amount of observable market data, valuation models are developed that incorporate proprietary views of market factors. Significant unobservable inputs used to develop the valuation models include volatility curves, correlation curves, illiquid pricing locations and credit/non-performance risk assumptions. Those valuation models are generally used in developing long-term forward price curves for certain commodities. We believe the development of such curves is consistent with industry practice; however, the fair value measurements resulting from such curves are classified as Level 3.
	The significant unobservable inputs and valuation models are developed by employees trained and experienced in market operations and fair value measurements and validated by the company's risk management group, which also further analyzes any significant changes in Level 3 measurements. Significant changes in the unobservable inputs could result in significant upward or downward changes in the fair value measurement.
	With respect to amounts presented in the following fair value hierarchy tables, the fair value measurement of an asset or liability (e.g., a contract) is required to fall in its entirety in one level, based on the lowest level input that is significant to the fair value measurement. Certain assets and liabilities would be classified in Level 2 instead of Level 3 of the hierarchy except for the effects of credit reserves and non-performance risk adjustments, respectively. Assessing the significance of a particular input to the fair value measurement in its entirety requires judgment, considering factors specific to the asset or liability being measured.
	Assets and liabilities measured at fair value on a recurring basis consisted of the following:
	March 31, 2015
		Level 1			Level 2				Level 3 (a)				Total
	Assets:
	Commodity contracts	$	361		$	54			$	69			$	484
	Nuclear decommissioning trust – equity securities (b)	378			219				—				597
	Nuclear decommissioning trust – debt securities (b)	—			308				—				308
	Total assets	$	739		$	581			$	69			$	1,389
	Liabilities:
	Commodity contracts	$	173		$	22			$	9			$	204
	Total liabilities	$	173		$	22			$	9			$	204
	December 31, 2014
		Level 1			Level 2				Level 3 (a)				Total
	Assets:
	Commodity contracts	$	402		$	46			$	49			$	497
	Nuclear decommissioning trust – equity securities (b)	375			217				—				592
	Nuclear decommissioning trust – debt securities (b)	—			301				—				301
	Total assets	$	777		$	564			$	49			$	1,390
	Liabilities:
	Commodity contracts	$	278		$	25			$	14			$	317
	Total liabilities	$	278		$	25			$	14			$	317
	____________
	(a)	See table below for description of Level 3 assets and liabilities.
	(b)	The nuclear decommissioning trust investment is included in the other investments line in the condensed consolidated balance sheets. See Note 17.
	Commodity contracts consist primarily of natural gas, electricity, fuel oil, uranium and coal agreements and include financial instruments entered into for hedging purposes as well as physical contracts that have not been designated normal purchases or sales. See Note 14 for further discussion regarding derivative instruments, including the termination of certain natural gas hedging agreements shortly after the Bankruptcy Filing.
	Nuclear decommissioning trust assets represent securities held for the purpose of funding the future retirement and decommissioning of our nuclear generation facility. These investments include equity, debt and other fixed-income securities consistent with investment rules established by the NRC and the PUCT.
	There were no significant transfers between Level 1 and Level 2 of the fair value hierarchy for the three months ended March 31, 2015 and 2014. See the table of changes in fair values of Level 3 assets and liabilities below for discussion of transfers between Level 2 and Level 3 for the three months ended March 31, 2015 and 2014.
	The following tables present the fair value of the Level 3 assets and liabilities by major contract type and the significant unobservable inputs used in the valuations at March 31, 2015 and December 31, 2014:
	March 31, 2015
			Fair Value
	Contract Type (a)		Assets			Liabilities				Total				Valuation Technique	Significant Unobservable Input	Range (b)
	Electricity purchases and sales		$	11		$	(2	)		$	9			Valuation Model	Illiquid pricing locations (c)	$25 to $45/ MWh
															Hourly price curve shape (d)	$20 to $60/ MWh
	Electricity spread options		4			(2		)		2				Option Pricing Model	Gas to power correlation (e)	20% to 95%
															Power volatility (f)	10% to 30%
	Electricity congestion revenue rights		42			(3		)		39				Market Approach (g)	Illiquid price differences between settlement points (h)	$0.00 to $20.00
	Coal purchases		—			(2		)		(2		)		Market Approach (g)	Illiquid price variances between heat content (j)	$0.00 to $0.50
	Other (k)		12			—				12
	Total		$	69		$	(9	)		$	60
	December 31, 2014
			Fair Value
	Contract Type (a)		Assets			Liabilities				Total				Valuation Technique	Significant Unobservable Input	Range (b)
	Electricity purchases and sales		$	4		$	(5	)		$	(1	)		Valuation Model	Illiquid pricing locations (c)	$30 to $50/ MWh
															Hourly price curve shape (d)	$20 to $70/ MWh
	Electricity spread options		2			(1		)		1				Option Pricing Model	Gas to power correlation (e)	15% to 95%
															Power volatility (f)	10% to 30%
	Electricity congestion revenue rights		38			(4		)		34				Market Approach (g)	Illiquid price differences between settlement points (h)	$0.00 to $20.00
	Coal purchases		—			(4		)		(4		)		Market Approach (g)	Illiquid price variances between mines (i)	$0.00 to $1.00
															Illiquid price variances between heat content (j)	$0.30 to $0.40
	Other (k)		5			—				5
	Total		$	49		$	(14	)		$	35
____________
(a)	Electricity purchase and sales contracts include hedging positions in the ERCOT regions, as well as power contracts, the valuations of which include unobservable inputs related to the hourly shaping of the price curve. Electricity spread option contracts consist of physical electricity call options. Electricity congestion revenue rights contracts consist of forward purchase contracts (swaps and options) used to hedge electricity price differences between settlement points within ERCOT. Coal purchase contracts relate to western (Powder River Basin) coal.
(b)	The range of the inputs may be influenced by factors such as time of day, delivery period, season and location.
(c)	Based on the historical range of forward average monthly ERCOT hub and load zone prices.
(d)	Based on the historical range of forward average hourly ERCOT North Hub prices.
(e)	Estimate of the historical range based on forward natural gas and on-peak power prices for the ERCOT hubs most relevant to our spread options.
(f)	Based on historical forward price changes.
(g)	While we use the market approach, there is either insufficient market data to consider the valuation liquid or the significance of credit reserves or non-performance risk adjustments results in a Level 3 designation.
(h)	Based on the historical price differences between settlement points within the ERCOT hubs and load zones.
(i)	Based on the historical range of price variances between mine locations.
(j)	Based on historical ranges of forward average prices between different heat contents (potential energy in coal for a given mass).
(k)	Other includes contracts for ancillary services, natural gas, diesel options, coal options and weather dependent power options.
The following table presents the changes in fair value of the Level 3 assets and liabilities for the three months ended March 31, 2015 and 2014.
	Three Months Ended March 31,
	2015			2014
Net asset (liability) balance at beginning of period	$	35		$	(973	)
Total unrealized valuation gains (losses)	16			(85		)
Purchases, issuances and settlements (a):
Purchases	19			9
Issuances	(3		)	(1		)
Settlements	(8		)	151
Transfers into Level 3 (b)	—			—
Transfers out of Level 3 (b)	1			2
Net change (c)	25			76
Net asset (liability) balance at end of period	$	60		$	(897	)
Unrealized valuation gains (losses) relating to instruments held at end of period	$	15		$	(71	)
____________
(a)	Settlements reflect reversals of unrealized mark-to-market valuations previously recognized in net income. Purchases and issuances reflect option premiums paid or received.
(b)	Includes transfers due to changes in the observability of significant inputs. Transfers in and out occur at the end of each quarter, which is when the assessments are performed. All Level 3 transfers during the periods presented are in and out of Level 2.
(c)	Substantially all changes in values of commodity contracts are reported in the condensed statements of consolidated income (loss) in net gain (loss) from commodity hedging and trading activities. Activity excludes changes in fair value in the month the positions settled as well as amounts related to positions entered into and settled in the same month.

Commodity_And_Other_Derivative

Commodity And Other Derivative Contractual Assets And Liabilities	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Commodity And Other Derivative Contractual Assets And Liabilities	COMMODITY AND OTHER DERIVATIVE CONTRACTUAL ASSETS AND LIABILITIES
	Strategic Use of Derivatives
	We transact in derivative instruments, such as options, swaps, futures and forward contracts, to manage commodity price risk. Because certain of these instruments are deemed to be forward contracts under the Bankruptcy Code, they are not subject to the automatic stay, and counterparties may elect to terminate the agreements. Prior to the Petition Date, we had entered into interest rate swaps to manage our interest rate risk exposure. See Note 13 for a discussion of the fair value of derivatives.
	Commodity Hedging and Trading Activity — TCEH has natural gas hedging positions designed to reduce exposure to changes in future electricity prices due to changes in the price of natural gas, thereby hedging future revenues from electricity sales and related cash flows. In ERCOT, the wholesale price of electricity has generally moved with the price of natural gas. TCEH has entered into market transactions involving natural gas-related financial instruments and has sold forward natural gas through 2016 in order to hedge a portion of electricity price exposure related to expected lignite/coal and nuclear fueled generation. TCEH also enters into derivatives, including electricity, natural gas, fuel oil, uranium, emission and coal instruments, generally for short-term hedging purposes. To a limited extent, TCEH also enters into derivative transactions for proprietary trading purposes, principally in natural gas and electricity markets. Unrealized gains and losses arising from changes in the fair value of hedging and trading instruments as well as realized gains and losses upon settlement of the instruments are reported in the condensed statements of consolidated income (loss) in net gain (loss) from commodity hedging and trading activities.
	Interest Rate Swap Transactions — Interest rate swap agreements have been used to reduce exposure to interest rate changes by converting floating-rate debt to fixed rates, thereby hedging future interest costs and related cash flows. Interest rate basis swaps were used to effectively reduce the hedged borrowing costs. Unrealized gains and losses arising from changes in the fair value of the swaps as well as realized gains and losses upon settlement of the swaps were reported in the condensed statements of consolidated income (loss) in interest expense and related charges. As of March 31, 2015 and December 31, 2014, we had no active interest rate swap derivatives.
	Termination of Commodity Hedges and Interest Rate Swaps — Commodity hedges and interest rate swaps entered into prior to the Petition Date are deemed to be forward contracts under the Bankruptcy Code. The Bankruptcy Filing constituted an event of default under these arrangements, and in accordance with the contractual terms, counterparties terminated certain positions shortly after the Bankruptcy Filing. The positions terminated consisted almost entirely of natural gas hedging positions and interest rate swaps that were secured by a first-lien interest in the same assets of TCEH on a pari passu basis with the TCEH Senior Secured Facilities and the TCEH Senior Secured Notes.
	Entities with a first-lien security interest included counterparties to both our natural gas hedging positions and interest rate swaps, which had entered into master agreements that provided for netting and setoff of amounts related to these positions. Additionally, certain counterparties to only our interest rate swaps hold the same first-lien security interest. The net liability recorded upon the terminations totaled $1.108 billion, which represented a realized loss of $1.225 billion related to the interest rate swaps, net of a realized gain of $117 million related to the natural gas hedging positions. Additionally, net accounts payable amounts related to matured interest rate swaps of $127 million are also secured by the same first-lien secured interest. The total net liability of $1.235 billion is subject to the terms of settlement of TCEH's first-lien claims ultimately approved by the Bankruptcy Court and is reported in the condensed consolidated balance sheets as a liability subject to compromise. Additionally, counterparties associated with the net liability are allowed, and have been receiving, adequate protection payments related to their claims as permitted by TCEH's cash collateral order approved by the Bankruptcy Court (see Note 7).
	Financial Statement Effects of Derivatives
	Substantially all derivative contractual assets and liabilities arise from mark-to-market accounting consistent with accounting standards related to derivative instruments and hedging activities. The following tables provide detail of commodity and other derivative contractual assets and liabilities (with the column totals representing the net positions of the contracts) as reported in the condensed consolidated balance sheets at March 31, 2015 and December 31, 2014. All amounts relate to commodity contracts.
		March 31, 2015								December 31, 2014
		Derivative				Derivative Liabilities				Derivative				Derivative Liabilities
		Assets								Assets
	Current assets	$	466			$	—			$	492			$	—
	Noncurrent assets	18				—				5				—
	Current liabilities	—				(202		)		—				(316		)
	Noncurrent liabilities	—				(2		)		—				(1		)
	Net assets (liabilities)	$	484			$	(204	)		$	497			$	(317	)
	At March 31, 2015 and December 31, 2014, there were no derivative positions accounted for as cash flow or fair value hedges.
	The following table presents the pretax effect of derivatives on net income (gains (losses)), including realized and unrealized effects:
			Three Months Ended March 31,
	Derivative (condensed statements of consolidated income (loss) presentation)		2015				2014
	Commodity contracts (Net gain (loss) from commodity hedging and trading activities) (a)		$	125			$	(179	)
	Interest rate swaps (Interest expense and related charges) (b)		—				(82		)
	Net gain (loss)		$	125			$	(261	)
	____________
	(a)	Amount represents changes in fair value of positions in the derivative portfolio during the period, as realized amounts related to positions settled are assumed to equal reversals of previously recorded unrealized amounts.
	(b)	Includes unrealized mark-to-market net gain (loss) as well as the net realized effect on interest paid/accrued, both reported in Interest Expense and Related Charges (see Note 7).
	The pretax effect (all losses) on net income and other comprehensive income (OCI) of derivative instruments previously accounted for as cash flow hedges was immaterial in both the three months ended March 31, 2015 and 2014. There were no amounts recognized in OCI for the three months ended March 31, 2015 and 2014.
	Accumulated other comprehensive income related to cash flow hedges (excluding Oncor's interest rate hedges) at March 31, 2015 and December 31, 2014 totaled $35 million and $36 million in net losses (after-tax), respectively, substantially all of which relates to interest rate swaps previously accounted for as cash flow hedges. We expect that $2 million of net losses (after-tax) related to cash flow hedges included in accumulated other comprehensive income at March 31, 2015 will be reclassified into net income during the next twelve months as the related hedged transactions affect net income.
	Balance Sheet Presentation of Derivatives
	Consistent with elections under US GAAP to present amounts on a gross basis, we report derivative assets and liabilities in the condensed consolidated balance sheets without taking into consideration netting arrangements we have with counterparties. We may enter into offsetting positions with the same counterparty, resulting in both assets and liabilities. Volatility in underlying commodity prices can result in significant changes in assets and liabilities presented from period to period.
	Margin deposits that contractually offset these derivative instruments are reported separately in the condensed consolidated balance sheets. Margin deposits received from counterparties are either used for working capital or other corporate purposes or are deposited in a separate restricted cash account. At March 31, 2015 and December 31, 2014, all margin deposits held were unrestricted.
	We maintain standardized master netting agreements with certain counterparties that allow for the netting of positive and negative exposures. Generally, we utilize the International Swaps and Derivatives Association (ISDA) standardized contract for financial transactions, the Edison Electric Institute standardized contract for physical power transactions and the North American Energy Standards Board (NAESB) standardized contract for physical natural gas transactions. These contain credit enhancements that allow for the right to offset assets and liabilities and collateral received in order to reduce credit exposure between us and the counterparty. These agreements contain specific language related to margin requirements, monthly settlement netting, cross-commodity netting and early termination netting, which is negotiated with the contract counterparty.
	The following tables reconcile our derivative assets and liabilities as presented in the condensed consolidated balance sheets to net amounts after taking into consideration netting arrangements with counterparties and financial collateral:
	March 31, 2015
			Amounts Presented in Balance Sheet				Offsetting Instruments (a)				Financial Collateral (Received) Pledged (b)				Net Amounts
	Derivative assets:
	Commodity contracts		$	484			$	(195	)		$	(93	)		$	196
	Derivative liabilities:
	Commodity contracts		(204		)		195				1				(8		)
	Net amounts		$	280			$	—			$	(92	)		$	188
	December 31, 2014
			Amounts Presented in Balance Sheet				Offsetting Instruments (a)				Financial Collateral (Received) Pledged (b)				Net Amounts
	Derivative assets:
	Commodity contracts		$	497			$	(298	)		$	(16	)		$	183
	Derivative liabilities:
	Commodity contracts		(317		)		298				2				(17		)
	Net amounts		$	180			$	—			$	(14	)		$	166
	____________
	(a)	Amounts presented exclude trade accounts receivable and payable related to settled financial instruments.
	(b)	Financial collateral consists entirely of cash margin deposits.
	Derivative Volumes
	The following table presents the gross notional amounts of derivative volumes at March 31, 2015 and December 31, 2014:
			March 31, 2015			December 31, 2014
	Derivative type		Notional Volume						Unit of Measure
	Natural gas (a)		2,115			1,687			Million MMBtu
	Electricity		30,814			22,820			GWh
	Congestion Revenue Rights (b)		89,637			89,484			GWh
	Coal		8			10			Million US tons
	Fuel oil		38			36			Million gallons
	Uranium		252			150			Thousand pounds
	____________
	(a)	Represents gross notional forward sales, purchases and options transactions, locational basis swaps and other natural gas transactions.
	(b)	Represents gross forward purchases associated with instruments used to hedge electricity price differences between settlement points within ERCOT.
Credit Risk-Related Contingent Features of Derivatives
The agreements that govern our derivative instrument transactions may contain certain credit risk-related contingent features that could trigger liquidity requirements in the form of cash collateral, letters of credit or some other form of credit enhancement. Certain of these agreements require the posting of collateral if our credit rating is downgraded by one or more credit rating agencies; however, due to our credit ratings being below investment grade, substantially all of such collateral posting requirements have already been effective.
At March 31, 2015 and December 31, 2014, the fair value of liabilities related to derivative instruments under agreements with credit risk-related contingent features that were not fully collateralized and the liquidity exposure associated with those liabilities were immaterial.
In addition, certain derivative agreements that are collateralized primarily with liens on certain of our assets include indebtedness cross-default provisions that have resulted in the termination of such contracts as a result of the Bankruptcy Filing. Substantially all of the credit risk-related contingent features related to these derivatives, including amounts related to cross-default provisions, were triggered upon the Bankruptcy Filing, and substantially all of the contracts had been cancelled. There was no liquidity exposure associated with these liabilities at both March 31, 2015 and December 31, 2014. See Note 10 for a description of other pre-petition obligations that are supported by liens on certain of our assets.
As discussed immediately above, the aggregate fair values of liabilities under derivative agreements with credit risk-related contingent features, including cross-default provisions, were not material at both March 31, 2015 and December 31, 2014.
Some commodity derivative contracts contain credit risk-related contingent features that do not provide for specific amounts to be posted if the features are triggered. These provisions include material adverse change, performance assurance, and other clauses that generally provide counterparties with the right to request additional credit enhancements. The amounts disclosed above exclude credit risk-related contingent features that do not provide for specific amounts or exposure calculations.
Concentrations of Credit Risk Related to Derivatives
We have concentrations of credit risk with the counterparties to our derivative contracts. At March 31, 2015, total credit risk exposure to all counterparties related to derivative contracts totaled $535 million (including associated accounts receivable). The net exposure to those counterparties totaled $229 million at March 31, 2015 after taking into effect netting arrangements, setoff provisions and collateral, with the largest net exposure to a single counterparty totaling $49 million. At March 31, 2015, the credit risk exposure to the banking and financial sector represented 72% of the total credit risk exposure and 46% of the net exposure.
Exposure to banking and financial sector counterparties is considered to be within an acceptable level of risk tolerance because substantially all of this exposure is with counterparties with investment grade credit ratings. However, this concentration increases the risk that a default by any of these counterparties would have a material effect on our financial condition, results of operations and liquidity. The transactions with these counterparties contain certain provisions that would require the counterparties to post collateral in the event of a material downgrade in their credit rating.
We maintain credit risk policies with regard to our counterparties to minimize overall credit risk. These policies authorize specific risk mitigation tools including, but not limited to, use of standardized master agreements that allow for netting of positive and negative exposures associated with a single counterparty. Credit enhancements such as parent guarantees, letters of credit, surety bonds, liens on assets and margin deposits are also utilized. Prospective material changes in the payment history or financial condition of a counterparty or downgrade of its credit quality result in the reassessment of the credit limit with that counterparty. The process can result in the subsequent reduction of the credit limit or a request for additional financial assurances. An event of default by one or more counterparties could subsequently result in termination-related settlement payments that reduce available liquidity if amounts are owed to the counterparties related to the derivative contracts or delays in receipts of expected settlements if the counterparties owe amounts to us.

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS
	The following represent our significant related-party transactions.
	•	On a quarterly basis, we accrue a management fee payable to the Sponsor Group under the terms of a management agreement. Related amounts expensed and reported as SG&A expense totaled $10 million for both the three months ended March 31, 2015 and 2014. No payments were made in the three months ended March 31, 2015 and 2014. We had previously paid these fees on a quarterly basis, however, beginning with the quarterly management fee due December 31, 2013, the Sponsor Group, while reserving the right to receive the fees, directed EFH Corp. to suspend payments of the management fees for an indefinite period. Effective with the Petition Date, EFH Corp. suspended allocations of such fees to TCEH and EFIH. Fees accrued as of the Petition Date have been reclassified to liabilities subject to compromise (LSTC), and fees accrued after the Petition Date have been reported in other noncurrent liabilities and deferred credits.
	•	In 2007, TCEH entered into the TCEH Senior Secured Facilities with syndicates of financial institutions and other lenders. These syndicates included affiliates of GS Capital Partners, which is a member of the Sponsor Group. Affiliates of each member of the Sponsor Group have from time to time engaged in commercial banking transactions with us and/or provided financial advisory services to us, in each case in the normal course of business.
	•	Affiliates of GS Capital Partners were parties to certain commodity and interest rate hedging transactions with us in the normal course of business.
	•	Affiliates of the Sponsor Group have sold or acquired, and in the future may sell or acquire, debt or debt securities issued by us in open market transactions or through loan syndications.
	•	EFH Corp. and EFIH have purchased, or received in exchanges, certain debt securities of EFH Corp. and TCEH, which they have held. Principal and interest payments received by EFH Corp. and EFIH on these investments have been used, in part, to service their outstanding debt. These investments are eliminated in consolidation in these consolidated financial statements. EFIH held $1.282 billion principal amount of EFH Corp. debt and $79 million principal amount of TCEH debt at both March 31, 2015 and December 31, 2014. EFH Corp. held $303 million principal amount of TCEH debt at both March 31, 2015 and December 31, 2014.
	•	TCEH's retail operations pay Oncor for services it provides, principally the delivery of electricity. Expenses recorded for these services, reported in fuel, purchased power costs and delivery fees, totaled $236 million and $241 million for the three months ended March 31, 2015 and 2014, respectively. The fees are based on rates regulated by the PUCT that apply to all REPs. The condensed consolidated balance sheets at March 31, 2015 and December 31, 2014 reflect amounts due currently to Oncor totaling $128 million and $118 million, respectively (included in net payables due to unconsolidated subsidiary), largely related to these electricity delivery fees. Also see discussion below regarding receivables from Oncor under a Federal and State Income Tax Allocation Agreement.
	•	A subsidiary of EFH Corp. bills Oncor for financial and other administrative services and shared facilities at cost. Such amounts reduced reported SG&A expense by $6 million and $9 million for the three months ended March 31, 2015 and 2014, respectively.
	•	A subsidiary of EFH Corp. bills TCEH subsidiaries for information technology, financial, accounting and other administrative services at cost. These charges totaled $51 million and $56 million for the three months ended March 31, 2015 and 2014, respectively.
	•	See Note 10 for discussion of a letter of credit issued by TCEH in 2014 to a subsidiary of EFH Corp. to secure its amounts payable to the subsidiary arising from recurring transactions in the normal course.
	•	For the three months ended March 31, 2015, TCEH settled a $15 million payable related to information technology assets purchased from a subsidiary of EFH Corp. in 2014. The assets are substantially for the use of TCEH and its subsidiaries.
	•	Under Texas regulatory provisions, the trust fund for decommissioning the Comanche Peak nuclear generation facility is funded by a delivery fee surcharge billed to REPs by Oncor, as collection agent, and remitted monthly to TCEH for contribution to the trust fund with the intent that the trust fund assets, reported in other investments in our condensed consolidated balance sheets, will ultimately be sufficient to fund the future decommissioning liability, reported in noncurrent liabilities in our condensed consolidated balance sheets. The delivery fee surcharges remitted to TCEH totaled $4 million for both the three months ended March 31, 2015 and 2014. Income and expenses associated with the trust fund and the decommissioning liability incurred by TCEH are offset by a net change in a receivable/payable that ultimately will be settled through changes in Oncor's delivery fee rates. At March 31, 2015 and December 31, 2014, the excess of the trust fund balance over the decommissioning liability resulted in a payable totaling $485 million and $479 million, respectively, and is reported in noncurrent liabilities.
	•	We file a consolidated federal income tax return that includes Oncor Holdings' results. Oncor is not a member of our consolidated tax group, but our consolidated federal income tax return includes our portion of Oncor's results due to our equity ownership in Oncor. We also file a consolidated Texas state margin tax return that includes all of Oncor Holdings' and Oncor's results. However, under a Federal and State Income Tax Allocation Agreement, Oncor Holdings' and Oncor's federal income tax and Texas margin tax expense and related balance sheet amounts, including our income taxes receivable from or payable to Oncor Holdings and Oncor, are recorded as if Oncor Holdings and Oncor file their own corporate income tax returns.
	At March 31, 2015, our net current amount payable to Oncor Holdings related to federal and state income taxes (reported in net payables due to unconsolidated subsidiary) totaled $49 million, $48 million of which related to Oncor. The $48 million net payable to Oncor included a $79 million federal income tax payable offset by a $31 million state margin tax receivable. Additionally, at March 31, 2015 we had a noncurrent tax payable to Oncor of $69 million recorded in other noncurrent liabilities and deferred credits and a noncurrent tax receivable from Oncor Holdings of $4 million recorded in other noncurrent assets. At December 31, 2014, our net current amount payable to Oncor Holdings totaled $120 million, all of which related to Oncor. The $120 million net payable to Oncor included a $144 million federal income tax payable offset by a $24 million state margin tax receivable. Additionally, at December 31, 2014 we had noncurrent tax payable to Oncor of $64 million recorded in other noncurrent liabilities and deferred credits.
	For the three months ended March 31, 2015 and 2014, EFH Corp. received income tax payments from Oncor Holdings totaling $6 million and $5 million, respectively. For both the three months ended March 31, 2015 and 2014, EFH Corp. received no income tax payments from Oncor.
	•	Certain transmission and distribution utilities in Texas have requirements in place to assure adequate creditworthiness of any REP to support the REP's obligation to collect securitization bond-related (transition) charges on behalf of the utility. Under these requirements, as a result of TCEH's credit rating being below investment grade, TCEH is required to post collateral support in an amount equal to estimated transition charges over specified time periods. Accordingly, at both March 31, 2015 and December 31, 2014, TCEH had posted letters of credit and/or cash in the amount of $9 million for the benefit of Oncor.
	•	In December 2012, Oncor became the sponsor of a new pension plan (the Oncor Plan), the participants in which consist of all of Oncor's active employees and all retirees and terminated vested participants of EFH Corp. and its subsidiaries (including discontinued businesses). Oncor had previously contractually agreed to assume responsibility for pension liabilities that are recoverable by Oncor under regulatory rate-setting provisions. As part of the pension plan actions, EFH Corp. fully funded the non-recoverable pension liabilities under the Oncor Plan. After the pension plan actions, participants remaining in the EFH Corp. pension plan consist of active employees under collective bargaining agreements (union employees). Oncor continues to be responsible for the recoverable portion of pension obligations to these union employees. Under ERISA, EFH Corp. and Oncor remain jointly and severally liable for the funding of the EFH Corp. and Oncor pension plans. We view the risk of the retained liability under ERISA related to the Oncor Plan to be not significant.
	•	EFH Corp.'s condensed consolidated balance sheets reflect unfunded pension and OPEB liabilities related to plans that it sponsors, but also reflects a receivable from Oncor for that portion of the unfunded liabilities for which Oncor is contractually responsible, substantially all of which is expected to be recovered in Oncor's rates. At both March 31, 2015 and December 31, 2014, the receivable amount relates only to the EFH Corp. pension plan and totaled $47 million. The amounts are classified as a noncurrent receivable from unconsolidated subsidiary. Net amounts of pension and OPEB expenses recognized in the three months ended March 31, 2015 and 2014 are not material.
	•	In the first quarter of 2014, a cash contribution totaling $84 million was made to the EFH Corp. retirement plan, of which $64 million was contributed by Oncor and $20 million was contributed by TCEH, which resulted in the EFH Corp. retirement plan being fully funded as calculated under the provisions of ERISA. As a result of the Bankruptcy Filing, participants in the EFH Corp. retirement plan who choose to retire would not be eligible for the lump sum payout option under the retirement plan unless the EFH Corp. retirement plan was fully funded. The payment by TCEH was accounted for as an advance to EFH Corp. that will be settled as pension and OPEB expenses are allocated to TCEH in the normal course.
	•	Oncor and Texas Holdings agreed to the terms of a stipulation with major interested parties to resolve all outstanding issues in the PUCT review related to the Merger. As part of this stipulation, TCEH would be required to post a letter of credit in an amount equal to $170 million to secure its payment obligations to Oncor in the event, which has not occurred, two or more rating agencies downgrade Oncor's credit rating below investment grade.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION
	Our operations are aligned into two reportable business segments: Competitive Electric and Regulated Delivery. The segments are managed separately because they are strategic business units that offer different products or services and involve different risks.
	The Competitive Electric segment is engaged in competitive market activities consisting of electricity generation, wholesale energy sales and purchases, commodity risk management and trading activities, and retail electricity operations for residential and business customers, all largely in the ERCOT market. These activities are conducted by TCEH.
	The Regulated Delivery segment consists largely of our investment in Oncor. Oncor is engaged in regulated electricity transmission and distribution operations in Texas. These activities are conducted by Oncor, including its wholly owned bankruptcy-remote financing subsidiary. See Note 3 for discussion of the reporting of Oncor Holdings and, accordingly, the Regulated Delivery segment, as an equity method investment. See Note 15 for discussion of material transactions with Oncor, including payment to Oncor of electricity delivery fees, which are based on rates regulated by the PUCT.
	Corporate and Other represents the remaining non-segment operations consisting primarily of discontinued businesses, general corporate expenses and interest and other expenses related to EFH Corp., EFIH and EFCH.
	The business segment results reflect the application of ASC 852, Reorganizations. The accounting policies of the business segments are the same as those described in the summary of significant accounting policies in Note 1 to the Financial Statements in our 2014 Form 10-K. Our chief operating decision maker uses more than one measure to assess segment performance, including reported segment net income (loss), which is the measure most comparable to consolidated net income (loss) prepared based on GAAP. We account for intersegment sales and transfers as if the sales or transfers were to third parties, that is, at current market prices or regulated rates. Certain shared services costs are allocated to the segments.
		Three Months Ended March 31,
		2015			2014
	Operating revenues (all Competitive Electric)	$	1,272		$	1,517
	Equity in earnings of unconsolidated subsidiaries (net of tax) — Regulated Delivery (net of noncontrolling interests of $20 and $21)	$	75		$	80
	Net income (loss):
	Competitive Electric	$	(1,336	)	$	(567	)
	Regulated Delivery	75			80
	Corporate and Other	(266		)	(122		)
	Consolidated net loss	$	(1,527	)	$	(609	)

Supplementary_Financial_Inform

Supplementary Financial Information	3 Months Ended
	Mar. 31, 2015
Supplementary Financial Information [Abstract]
Supplementary Financial Information	SUPPLEMENTARY FINANCIAL INFORMATION
	Other Income and Deductions
		Three Months Ended March 31,
		2015			2014
	Other income:
	Office space rental income (a)	$	3		$	3
	Mineral rights royalty income (b)	1			1
	All other	4			5
	Total other income	$	8		$	9
	Other deductions:
	Impairment of favorable purchase contracts (Note 4) (b)	$	8		$	—
	Impairment of emission allowances (Note 4) (b)	51			—
	All other	1			—
	Total other deductions	$	60		$	—
	____________
	(a)	Reported in Corporate and Other.
	(b)	Reported in Competitive Electric segment.
	Restricted Cash
		March 31, 2015						December 31, 2014
		Current			Noncurrent Assets			Current			Noncurrent Assets
		Assets						Assets
	Amounts related to TCEH's DIP Facility (Note 9)	$	—		$	367		$	—		$	350
	Amounts related to TCEH's pre-petition Letter of Credit	—			506			—			551
	Facility (Note 10) (a)
	Other	6			—			6			—
	Total restricted cash	$	6		$	873		$	6		$	901
	____________
	(a)	See Note 10 for discussion of letter of credit draws in 2014 and 2015.
	Trade Accounts Receivable
		March 31,			December 31,
		2015			2014
	Wholesale and retail trade accounts receivable	$	554		$	604
	Allowance for uncollectible accounts	(15		)	(15		)
	Trade accounts receivable — net	$	539		$	589
	Gross trade accounts receivable at March 31, 2015 and December 31, 2014 included unbilled revenues of $198 million and $239 million, respectively.
	Allowance for Uncollectible Accounts Receivable
		Three Months Ended March 31,
		2015			2014
	Allowance for uncollectible accounts receivable at beginning of period	$	15		$	14
	Increase for bad debt expense	9			10
	Decrease for account write-offs	(9		)	(7		)
	Allowance for uncollectible accounts receivable at end of period	$	15		$	17
	Inventories by Major Category
		March 31,			December 31,
		2015			2014
	Materials and supplies	$	215		$	214
	Fuel stock	230			215
	Natural gas in storage	25			39
	Total inventories	$	470		$	468
	Other Investments
		March 31,			December 31,
		2015			2014
	Nuclear plant decommissioning trust	$	905		$	893
	Assets related to employee benefit plans, including employee savings programs, net of distributions	62			61
	Land	36			37
	Miscellaneous other	4			4
	Total other investments	$	1,007		$	995
	Nuclear Decommissioning Trust — Investments in a trust that will be used to fund the costs to decommission the Comanche Peak nuclear generation plant are carried at fair value. Decommissioning costs are being recovered from Oncor's customers as a delivery fee surcharge over the life of the plant and deposited by TCEH in the trust fund. Income and expense associated with the trust fund and the decommissioning liability are offset by a corresponding change in a receivable/payable (currently a payable reported in noncurrent liabilities) that will ultimately be settled through changes in Oncor's delivery fees rates (see Note 15). The nuclear decommissioning trust fund is not a debtor under the Chapter 11 Cases. A summary of investments in the fund follows:
		March 31, 2015
		Cost (a)			Unrealized gain			Unrealized loss			Fair market
											value
	Debt securities (b)	$	295		$	13		$	—		$	308
	Equity securities (c)	281			321			(5		)	597
	Total	$	576		$	334		$	(5	)	$	905
	December 31, 2014
	Cost (a)			Unrealized gain			Unrealized loss			Fair market
										value
Debt securities (b)	$	288		$	13		$	—		$	301
Equity securities (c)	276			320			(4		)	592
Total	$	564		$	333		$	(4	)	$	893
____________
(a)	Includes realized gains and losses on securities sold.
(b)	The investment objective for debt securities is to invest in a diversified tax efficient portfolio with an overall portfolio rating of AA or above as graded by S&P or Aa2 by Moody's Investors Services, Inc. The debt securities are heavily weighted with municipal bonds. The debt securities had an average coupon rate of 4.32% and 4.35% at March 31, 2015 and December 31, 2014, respectively, and an average maturity of 6 years at both March 31, 2015 and December 31, 2014.
(c)	The investment objective for equity securities is to invest tax efficiently and to match the performance of the S&P 500 Index.
Debt securities held at March 31, 2015 mature as follows: $80 million in one to five years, $72 million in five to ten years and $156 million after ten years.
The following table summarizes proceeds from sales of available-for-sale securities and the related realized gains and losses from such sales.
	Three Months Ended March 31,
	2015			2014
Realized gains	$	—		$	1
Realized losses	$	(1	)	$	—
Proceeds from sales of securities	$	23		$	33
Investments in securities	$	(27	)	$	(37	)
Property, Plant and Equipment
At March 31, 2015 and December 31, 2014, property, plant and equipment of $11.6 billion and $12.4 billion, respectively, is stated net of accumulated depreciation and amortization of $4.7 billion and $5.3 billion, respectively.
The estimated remaining useful lives of our lignite/coal and nuclear generation facilities range from 17 to 54 years. Those estimated lives are subject to change as market factors evolve, including changes in environmental regulation and wholesale electricity price forecasts.
Asset Retirement and Mining Reclamation Obligations
These liabilities primarily relate to nuclear generation plant decommissioning, land reclamation related to lignite mining, removal of lignite/coal fueled plant ash treatment facilities and generation plant asbestos removal and disposal costs. There is no earnings impact with respect to changes in the nuclear plant decommissioning liability, as all costs are recoverable through the regulatory process as part of Oncor's delivery fees.
In December 2014, the EPA signed the final Disposal of Coal Combustion Residuals from Electric Utilities rule, and in April 2015, the rule was posted in the Federal Register. While we continue to review the rule, our initial estimates are that it will result in approximately $100 million of capital expenditures from 2015 through 2020 for our lignite/coal fueled generation facilities. We are in the process of determining the effect of the rule on our asset retirement obligations.
The following table summarizes the changes to these obligations, reported in other current liabilities and other noncurrent liabilities and deferred credits in the condensed consolidated balance sheets, for the three months ended March 31, 2015:
	Nuclear Plant Decommissioning			Mining Land Reclamation			Other			Total
Liability at December 31, 2014	$	413		$	165		$	36		$	614
Additions:
Accretion	6			5			1			12
Reductions:
Payments	—			(14		)	—			(14		)
Liability at March 31, 2015	419			156			37			612
Less amounts due currently	—			(58		)	—			(58		)
Noncurrent liability at March 31, 2015	$	419		$	98		$	37		$	554
Other Noncurrent Liabilities and Deferred Credits
The balance of other noncurrent liabilities and deferred credits consists of the following:
	March 31,			December 31,
	2015			2014
Uncertain tax positions, including accrued interest	$	75		$	74
Retirement plan and other employee benefits (a)	244			243
Asset retirement and mining reclamation obligations	554			560
Unfavorable purchase and sales contracts	560			566
Nuclear decommissioning fund excess over asset retirement obligation (Note 15)	485			479
Other	181			155
Total other noncurrent liabilities and deferred credits	$	2,099		$	2,077
____________
(a)	Includes $47 million at both March 31, 2015 and December 31, 2014, representing pension liabilities related to Oncor (see Note 15).
Unfavorable Purchase and Sales Contracts — The amortization of unfavorable purchase and sales contracts totaled $6 million for both the three months ended March 31, 2015 and 2014. See Note 4 for intangible assets related to favorable purchase and sales contracts.
The estimated amortization of unfavorable purchase and sales contracts for each of the next five fiscal years is as follows:
Year		Amount
2015		$	24
2016		$	24
2017		$	24
2018		$	24
2019		$	24
Fair Value of Debt
		March 31, 2015						December 31, 2014
Debt:		Carrying Amount			Fair			Carrying Amount			Fair
					Value						Value
Borrowings under debtor-in-possession credit facilities (Note 9)		$	6,825		$	6,852		$	6,825		$	6,830
Pre-petition notes, loans and other debt reported as liabilities subject to compromise (Note 10)		$	35,411		$	19,633		$	35,857		$	21,411
Long-term debt not subject to compromise, excluding capital lease obligations (Note 9)		$	114		$	115		$	123		$	119
We determine fair value in accordance with accounting standards as discussed in Note 13, and at March 31, 2015, our debt fair value represents Level 2 valuations. We obtain security pricing from an independent party who uses broker quotes and third-party pricing services to determine fair values. Where relevant, these prices are validated through subscription services such as Bloomberg.
Supplemental Cash Flow Information
	Three Months Ended March 31,
	2015			2014
Cash payments related to:
Interest paid (a)	$	671		$	622
Capitalized interest	(3		)	(7		)
Interest paid (net of capitalized interest) (a)	$	668		$	615
Income taxes	$	—		$	—
Reorganization items (b)	$	89		$	—
Noncash investing and financing activities:
Construction expenditures (c)	$	65		$	30
____________
(a)	Net of amounts received under interest rate swap agreements. For the three months ended March 31, 2015, this amount also includes amounts paid for adequate protection.
(b)	Represents cash payments for legal and other consulting services.
(c)	Represents end-of-period accruals.

Business_And_Significant_Accou1

Business And Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation, Including Application of Bankruptcy Accounting	Basis of Presentation, Including Application of Bankruptcy Accounting
	The condensed consolidated financial statements have been prepared in accordance with US GAAP. The condensed consolidated financial statements have been prepared as if EFH Corp. is a going concern and contemplate the realization of assets and liabilities in the normal course of business. The condensed consolidated financial statements reflect the application of Financial Accounting Standards Board Accounting Standards Codification (ASC) 852, Reorganizations. During the pendency of the Chapter 11 Cases, the Debtors will operate their businesses as debtors-in-possession under the jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code. ASC 852 applies to entities that have filed a petition for bankruptcy under Chapter 11 of the Bankruptcy Code. The guidance requires that transactions and events directly associated with the reorganization be distinguished from the ongoing operations of the business. In addition, the guidance provides for changes in the accounting and presentation of liabilities. See Notes 8 and 10 for discussion of these accounting and reporting changes.
	Investments in unconsolidated subsidiaries, which are 50% or less owned and/or do not meet accounting standards criteria for consolidation, are accounted for under the equity method (see Note 3). Adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the results of operations and financial position have been included therein. All intercompany items and transactions have been eliminated in consolidation. Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with US GAAP have been omitted pursuant to the rules and regulations of the SEC. Because the condensed consolidated interim financial statements do not include all of the information and footnotes required by US GAAP, they should be read in conjunction with the audited financial statements and related notes included in our 2014 Form 10-K. The results of operations for an interim period may not give a true indication of results for a full year. All dollar amounts in the financial statements and tables in the notes are stated in millions of US dollars unless otherwise indicated.
Use of Estimates	Use of Estimates
	Preparation of financial statements requires 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 and estimates of expected allowed claims. 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.

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	3 Months Ended
	Mar. 31, 2015
Consolidation Of Variable Interest Entities [Abstract]
Schedule of condensed statements of consolidated income of Oncor Holdings and its subsidiaries	Condensed statements of consolidated income of Oncor Holdings and its subsidiaries for the three months ended March 31, 2015 and 2014 are presented below:
		Three Months Ended March 31,
		2015			2014
	Operating revenues	$	946		$	917
	Operation and maintenance expenses	(380		)	(345		)
	Depreciation and amortization	(217		)	(210		)
	Taxes other than income taxes	(111		)	(108		)
	Other income	2			4
	Other deductions	(4		)	(3		)
	Interest income	1			1
	Interest expense and related charges	(81		)	(88		)
	Income before income taxes	156			168
	Income tax expense	(61		)	(67		)
	Net income	95			101
	Net income attributable to noncontrolling interests	(20		)	(21		)
	Net income attributable to Oncor Holdings	$	75		$	80
Schedule of assets and liabilities of Oncor Holdings	Assets and liabilities of Oncor Holdings at March 31, 2015 and December 31, 2014 are presented below:
		March 31,			December 31,
		2015			2014
	ASSETS
	Current assets:
	Cash and cash equivalents	$	18		$	5
	Restricted cash	58			56
	Trade accounts receivable — net	417			407
	Trade accounts and other receivables from affiliates	128			118
	Income taxes receivable from EFH Corp.	80			144
	Inventories	79			73
	Accumulated deferred income taxes	10			10
	Prepayments and other current assets	92			91
	Total current assets	882			904
	Restricted cash	16			16
	Other investments	97			97
	Property, plant and equipment — net	12,626			12,463
	Goodwill	4,064			4,064
	Regulatory assets — net	1,349			1,429
	Other noncurrent assets	71			67
	Total assets	$	19,105		$	19,040
	LIABILITIES
	Current liabilities:
	Short-term borrowings	$	800		$	711
	Long-term debt due currently	109			639
	Trade accounts payable — nonaffiliates	158			202
	Income taxes payable to EFH Corp.	31			24
	Accrued taxes other than income	66			174
	Accrued interest	56			93
	Other current liabilities	117			156
	Total current liabilities	1,337			1,999
	Accumulated deferred income taxes	1,949			1,978
	Long-term debt, less amounts due currently	5,720			4,997
	Other noncurrent liabilities and deferred credits	2,260			2,245
	Total liabilities	$	11,266		$	11,219

Goodwill_And_Identifiable_Inta1

Goodwill And Identifiable Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table provides information regarding our goodwill balance, all of which relates to the Competitive Electric segment and arose in connection with accounting for the Merger. None of the goodwill is being deducted for tax purposes.
	Goodwill before impairment charges	$	18,342
	Accumulated noncash impairment charges	(15,990		)
	Balance at December 31, 2014	2,352
	Additional noncash impairment charge in 2015	(700		)
	Balance at March 31, 2015 (a)	$	1,652
Schedule of identifiable intangible assets reported in the balance sheet	Identifiable intangible assets, including amounts that arose in connection with accounting for the Merger, are comprised of the following:
			March 31, 2015							December 31, 2014
	Identifiable Intangible Asset		Gross			Accumulated		Net		Gross		Accumulated		Net
			Carrying			Amortization				Carrying		Amortization
			Amount							Amount
	Retail customer relationship		$	463		$	429	$	34	$	463	$	425	$	38
	Capitalized in-service software		346			203		143		362		216		146
	Other identifiable intangible assets (a)		68			7		61		460		291		169
	Total identifiable intangible assets subject to amortization		$	877		$	639	238		$	1,285	$	932	353
	Retail trade name (not subject to amortization)							955						955
	Mineral interests (not currently subject to amortization)							6						7
	Total identifiable intangible assets							$	1,199					$	1,315
	____________
	(a)	See discussion below regarding impairment charges recorded in the three months ended March 31, 2015 related to other identifiable intangible assets.
Schedule of amortization expense related to intangible assets (including income statement line item)	Amortization expense related to finite-lived identifiable intangible assets (including the condensed statements of consolidated income (loss) line item) consisted of:
	Identifiable Intangible Asset		Condensed Statement of Consolidated Income (Loss) Line		Segment	Three Months Ended March 31,
						2015		2014
	Retail customer relationship		Depreciation and amortization		Competitive Electric	$	4	$	6
	Capitalized in-service software		Depreciation and amortization		Competitive Electric and Corporate and Other	11		11
	Other identifiable intangible assets		Operating revenues/fuel, purchased power costs and delivery fees/depreciation and amortization		Competitive Electric	5		18
	Total amortization expense (a)					$	20	$	35
	____________
	(a)	Amounts recorded in depreciation and amortization totaled $15 million and $25 million for the three months ended March 31, 2015 and 2014, respectively.
Schedule of estimated aggregate amortization expense of intangible assets for each of the next five fiscal years	The estimated aggregate amortization expense of identifiable intangible assets for each of the next five fiscal years is as follows:
	Year		Estimated Amortization Expense
	2015		$	73
	2016		$	59
	2017		$	46
	2018		$	26
	2019		$	12

Income_Taxes_Tables

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Calculation of Effective Income Tax Rate	The calculation of our effective tax rate is as follows:
		Three Months Ended March 31,
		2015			2014
	Loss before income taxes and equity in earnings of unconsolidated subsidiaries	$	(2,003	)	$	(1,049	)
	Income tax benefit	$	401		$	360
	Effective tax rate	20		%	34.3		%

Interest_Expense_and_Related_C1

Interest Expense and Related Charges (Tables)	3 Months Ended
	Mar. 31, 2015
Interest Expense and Related Charges [Abstract]
Schedule of Interest Expense and Related Charges [Table Text Block]
		Three Months Ended March 31,
		2015				2014
	Interest paid/accrued on debtor-in-possession financing	$	73			$	—
	Adequate protection amounts paid/accrued (a)	302				—
	Interest paid/accrued on pre-petition debt (b)	237				831
	Interest expense on pre-petition toggle notes payable in additional principal (Note 10)	—				49
	Unrealized mark-to-market net gain on interest rate swaps	—				(65		)
	Amortization of interest rate swap losses at dedesignation of hedge accounting	—				(1		)
	Amortization of fair value debt discounts resulting from purchase accounting	—				5
	Amortization of debt issuance, amendment and extension costs and discounts	—				51
	Capitalized interest	(3		)		(7		)
	Total interest expense and related charges	$	609			$	863
	____________
	(a)	Post-petition period only.
	(b)	For the three months ended March 31, 2015, amounts include $235 million in post-petition interest related to the EFIH Second Lien Notes (see Note 10). Includes amounts related to interest rate swaps totaling zero and $146 million for the three months ended March 31, 2015 and 2014, respectively.
Contractual Interest Expense On Pre-Petition Liabilities [Table Text Block]
			Three Months Ended March 31, 2015
	Entity:		Contractual Interest on				Adequate Protection		Approved Interest Paid/Accrued (a)		Contractual Interest on
			Debt Classified as LSTC				Paid/Accrued				Debt Classified as LSTC Not
											Paid/Accrued
	EFH Corp.		$	31			$	—	$	—	$	31
	EFIH		111				—		50		61
	EFCH		2				—		—		2
	TCEH		513				288		—		225
	Eliminations (b)		(31		)		—		—		(31		)
	Total		$	626			$	288	$	50	$	288
	___________
	(a)	Represents portion of interest related to the EFIH Second Lien Notes that was repaid based on the approval of the Bankruptcy Court; however, excludes $185 million of post-petition interest paid in the three months ended March 31, 2015 that contractually related to 2014 (see Note 10).
	(b)	Represents contractual interest on affiliate debt held by EFH Corp. and EFIH that is classified as liabilities subject to compromise.

Reorganization_Items_Tables

Reorganization Items (Tables)	3 Months Ended
	Mar. 31, 2015
Reorganization Items [Abstract]
Reorganization Items [Table Text Block]	Expenses and income directly associated with the Chapter 11 Cases are reported separately in the condensed statements of consolidated income (loss) as reorganization items as required by ASC 852, Reorganizations. Reorganization items also include adjustments to reflect the carrying value of liabilities subject to compromise (LSTC) at their estimated allowed claim amounts, as such adjustments are determined. The following table presents reorganization items incurred in the three months ended March 31, 2015 as reported in the condensed statements of consolidated income (loss):
		Three Months Ended March 31, 2015
	Expenses related to legal advisory and representation services	$	50
	Expenses related to other professional consulting and advisory services	28
	Fees associated with repayment of EFIH Second Lien Notes (Note 10)	28
	Contract claims adjustments	32
	Total reorganization items	$	138

DebtorInPossession_Borrowing_F1

Debtor-In-Possession Borrowing Facilities (Tables)	3 Months Ended
	Mar. 31, 2015
Debtor-In-Possession Obligations [Abstract]
Schedule of Line of Credit Facilities [Table Text Block]	The TCEH DIP Facility and related available capacity at March 31, 2015 are presented below. Borrowings are reported in the condensed consolidated balance sheets as borrowings under debtor-in-possession credit facilities.
			March 31, 2015
	TCEH DIP Facility		Facility			Available Cash		Available Letter of Credit Capacity
			Limit			Borrowing Capacity
	TCEH DIP Revolving Credit Facility (a)		$	1,950		$	1,950	$	—
	TCEH DIP Term Loan Facility (b)		1,425			—		433
	Total TCEH DIP Facility		$	3,375		$	1,950	$	433
	___________
	(a)	Facility used for general corporate purposes. No amounts were borrowed at March 31, 2015. Pursuant to an order of the Bankruptcy Court, the TCEH Debtors may not have more than $1.650 billion of TCEH DIP Revolving Credit Facility cash borrowings outstanding without written consent of the TCEH committee of unsecured creditors and the ad hoc group of TCEH unsecured noteholders or further order of the Bankruptcy Court.
	(b)	Facility used for general corporate purposes, including but not limited to, $800 million for issuing letters of credit.
Schedule of Long-term Debt Instruments [Table Text Block]	Long-Term Debt Not Subject to Compromise — Amounts presented in the table below represent pre-petition liabilities that are not subject to compromise due to the debt being fully collateralized or specific orders from the Bankruptcy Court approving repayment of the debt.
		March 31,			December 31,
		2015			2014
	EFH Corp. (parent entity)
	8.82% Non-Debtor Building Financing due semiannually through February 11, 2022	$	38		$	40
	Unamortized fair value premium (a)	7			7
	Total EFH Corp.	45			47
	EFCH
	9.58% Fixed Notes due in annual installments through December 4, 2019 (b)	21			21
	8.254% Fixed Notes due in quarterly installments through December 31, 2021 (b)	27			29
	Unamortized fair value discount (a)	(3		)	(3		)
	Total EFCH	45			47
	TCEH
	7.48% Fixed Secured Facility Bonds with amortizing payments through January 2017 (c)	23			25
	7.46% Fixed Secured Facility Bonds with amortizing payments through January 2015 (c)	—			4
	Capital lease obligations	43			44
	Other	2			2
	Unamortized discount	(1		)	(2		)
	Total TCEH	67			73
	Total EFH Corp. consolidated	157			167
	Less amounts due currently	(36		)	(39		)
	Total long-term debt not subject to compromise	$	121		$	128
	____________
	(a)	Amount represents unamortized fair value adjustments recorded under purchase accounting.
	(b)	Approved by the Bankruptcy Court for repayment.
	(c)	Debt issued by trust and secured by assets held by the trust.
	Debt Reported as Liabilities Subject to Compromise
	Amounts presented below represent principal amounts of pre-petition notes, loans and other debt reported as liabilities subject to compromise.
		March 31,			December 31,
		2015			2014
	EFH Corp. (parent entity)
	9.75% Fixed Senior Notes due October 15, 2019	$	2		$	2
	10% Fixed Senior Notes due January 15, 2020	3			3
	10.875% Fixed Senior Notes due November 1, 2017	33			33
	11.25% / 12.00% Senior Toggle Notes due November 1, 2017	27			27
	5.55% Fixed Series P Senior Notes due November 15, 2014 (a)	90			90
	6.50% Fixed Series Q Senior Notes due November 15, 2024 (a)	201			201
	6.55% Fixed Series R Senior Notes due November 15, 2034 (a)	291			291
	Unamortized fair value discount (b)	(118		)	(118		)
	Total EFH Corp.	529			529
	EFIH
	11% Fixed Senior Secured Second Lien Notes due October 1, 2021	322			406
	11.75% Fixed Senior Secured Second Lien Notes due March 1, 2022	1,389			1,750
	11.25% / 12.25% Senior Toggle Notes due December 1, 2018	1,566			1,566
	9.75% Fixed Senior Notes due October 15, 2019	2			2
	Unamortized premium	243			243
	Unamortized discount	(121		)	(121		)
	Total EFIH	3,401			3,846
	EFCH
	Floating Rate Junior Subordinated Debentures, Series D due January 30, 2037	1			1
	8.175% Fixed Junior Subordinated Debentures, Series E due January 30, 2037	8			8
	Unamortized fair value discount (b)	(1		)	(1		)
	Total EFCH	8			8
	TCEH
	Senior Secured Facilities:
	TCEH Floating Rate Term Loan Facilities due October 10, 2014	3,809			3,809
	TCEH Floating Rate Letter of Credit Facility due October 10, 2014	42			42
		March 31,			December 31,
		2015			2014
	TCEH Floating Rate Revolving Credit Facility due October 10, 2016	$	2,054		$	2,054
	TCEH Floating Rate Term Loan Facilities due October 10, 2017 (a)	15,691			15,691
	TCEH Floating Rate Letter of Credit Facility due October 10, 2017	1,020			1,020
	11.5% Fixed Senior Secured Notes due October 1, 2020	1,750			1,750
	15% Fixed Senior Secured Second Lien Notes due April 1, 2021	336			336
15% Fixed Senior Secured Second Lien Notes due April 1, 2021, Series B	1,235			1,235
10.25% Fixed Senior Notes due November 1, 2015 (a)	1,833			1,833
10.25% Fixed Senior Notes due November 1, 2015, Series B (a)	1,292			1,292
10.50% / 11.25% Senior Toggle Notes due November 1, 2016	1,749			1,749
Pollution Control Revenue Bonds:
Brazos River Authority:
5.40% Fixed Series 1994A due May 1, 2029	39			39
7.70% Fixed Series 1999A due April 1, 2033	111			111
7.70% Fixed Series 1999C due March 1, 2032	50			50
8.25% Fixed Series 2001A due October 1, 2030	71			71
8.25% Fixed Series 2001D-1 due May 1, 2033	171			171
6.30% Fixed Series 2003B due July 1, 2032	39			39
6.75% Fixed Series 2003C due October 1, 2038	52			52
5.40% Fixed Series 2003D due October 1, 2029	31			31
5.00% Fixed Series 2006 due March 1, 2041	100			100
Sabine River Authority of Texas:
6.45% Fixed Series 2000A due June 1, 2021	51			51
5.20% Fixed Series 2001C due May 1, 2028	70			70
5.80% Fixed Series 2003A due July 1, 2022	12			12
6.15% Fixed Series 2003B due August 1, 2022	45			45
Trinity River Authority of Texas:
6.25% Fixed Series 2000A due May 1, 2028	14			14
Unamortized fair value discount related to pollution control revenue bonds (b)	(103		)	(103		)
Other:
Other	1			1
Unamortized discount	(91		)	(91		)
Total TCEH	31,474			31,474
Deferred debt issuance and extension costs	(733		)	(733		)
Total EFH Corp. consolidated notes, loans and other debt	$	34,679		$	35,124
___________
(a)	Excludes the following principal amounts of debt held by EFIH or EFH Corp. (parent entity) and eliminated in consolidation.
	March 31,			December 31,
	2015			2014
EFH Corp. 5.55% Fixed Series P Senior Notes due November 15, 2014	$	281		$	281
EFH Corp. 6.50% Fixed Series Q Senior Notes due November 15, 2024	545			545
EFH Corp. 6.55% Fixed Series R Senior Notes due November 15, 2034	456			456
TCEH Floating Rate Term Loan Facilities due October 10, 2017	19			19
TCEH 10.25% Fixed Senior Notes due November 1, 2015	213			213
TCEH 10.25% Fixed Senior Notes due November 1, 2015, Series B	150			150
Total	$	1,664		$	1,664
(b)	Amount represents unamortized fair value adjustments recorded under purchase accounting.

Liabilities_Subject_to_Comprom1

Liabilities Subject to Compromise (Tables)	3 Months Ended
	Mar. 31, 2015
Liabilities Subject to Compromise [Abstract]
Liabilities Subject To Compromise [Table Text Block]	The amounts classified as liabilities subject to compromise (LSTC) reflect the company's estimate of pre-petition liabilities and other expected allowed claims to be addressed in the Chapter 11 Cases and may be subject to future adjustment as the Chapter 11 Cases proceed. Debt amounts include related unamortized deferred financing costs and discounts/premiums. Amounts classified to LSTC do not include pre-petition liabilities that are fully collateralized by letters of credit or cash deposits. The following table presents LSTC as reported in the condensed consolidated balance sheets at March 31, 2015 and December 31, 2014:
		March 31,			December 31,
		2015			2014
	Notes, loans and other debt per the following table	$	34,679		$	35,124
	Accrued interest on notes, loans and other debt	749			804
	Net liability under terminated TCEH interest rate swap and natural gas hedging agreements (Note 14)	1,235			1,235
	Trade accounts payable and other expected allowed claims	272			269
	Total liabilities subject to compromise	$	36,935		$	37,432
Schedule of Long-term Debt Instruments [Table Text Block]	Long-Term Debt Not Subject to Compromise — Amounts presented in the table below represent pre-petition liabilities that are not subject to compromise due to the debt being fully collateralized or specific orders from the Bankruptcy Court approving repayment of the debt.
		March 31,			December 31,
		2015			2014
	EFH Corp. (parent entity)
	8.82% Non-Debtor Building Financing due semiannually through February 11, 2022	$	38		$	40
	Unamortized fair value premium (a)	7			7
	Total EFH Corp.	45			47
	EFCH
	9.58% Fixed Notes due in annual installments through December 4, 2019 (b)	21			21
	8.254% Fixed Notes due in quarterly installments through December 31, 2021 (b)	27			29
	Unamortized fair value discount (a)	(3		)	(3		)
	Total EFCH	45			47
	TCEH
	7.48% Fixed Secured Facility Bonds with amortizing payments through January 2017 (c)	23			25
	7.46% Fixed Secured Facility Bonds with amortizing payments through January 2015 (c)	—			4
	Capital lease obligations	43			44
	Other	2			2
	Unamortized discount	(1		)	(2		)
	Total TCEH	67			73
	Total EFH Corp. consolidated	157			167
	Less amounts due currently	(36		)	(39		)
	Total long-term debt not subject to compromise	$	121		$	128
	____________
	(a)	Amount represents unamortized fair value adjustments recorded under purchase accounting.
	(b)	Approved by the Bankruptcy Court for repayment.
	(c)	Debt issued by trust and secured by assets held by the trust.
	Debt Reported as Liabilities Subject to Compromise
	Amounts presented below represent principal amounts of pre-petition notes, loans and other debt reported as liabilities subject to compromise.
		March 31,			December 31,
		2015			2014
	EFH Corp. (parent entity)
	9.75% Fixed Senior Notes due October 15, 2019	$	2		$	2
	10% Fixed Senior Notes due January 15, 2020	3			3
	10.875% Fixed Senior Notes due November 1, 2017	33			33
	11.25% / 12.00% Senior Toggle Notes due November 1, 2017	27			27
	5.55% Fixed Series P Senior Notes due November 15, 2014 (a)	90			90
	6.50% Fixed Series Q Senior Notes due November 15, 2024 (a)	201			201
	6.55% Fixed Series R Senior Notes due November 15, 2034 (a)	291			291
	Unamortized fair value discount (b)	(118		)	(118		)
	Total EFH Corp.	529			529
	EFIH
	11% Fixed Senior Secured Second Lien Notes due October 1, 2021	322			406
	11.75% Fixed Senior Secured Second Lien Notes due March 1, 2022	1,389			1,750
	11.25% / 12.25% Senior Toggle Notes due December 1, 2018	1,566			1,566
	9.75% Fixed Senior Notes due October 15, 2019	2			2
	Unamortized premium	243			243
	Unamortized discount	(121		)	(121		)
	Total EFIH	3,401			3,846
	EFCH
	Floating Rate Junior Subordinated Debentures, Series D due January 30, 2037	1			1
	8.175% Fixed Junior Subordinated Debentures, Series E due January 30, 2037	8			8
	Unamortized fair value discount (b)	(1		)	(1		)
	Total EFCH	8			8
	TCEH
	Senior Secured Facilities:
	TCEH Floating Rate Term Loan Facilities due October 10, 2014	3,809			3,809
	TCEH Floating Rate Letter of Credit Facility due October 10, 2014	42			42
		March 31,			December 31,
		2015			2014
	TCEH Floating Rate Revolving Credit Facility due October 10, 2016	$	2,054		$	2,054
	TCEH Floating Rate Term Loan Facilities due October 10, 2017 (a)	15,691			15,691
	TCEH Floating Rate Letter of Credit Facility due October 10, 2017	1,020			1,020
	11.5% Fixed Senior Secured Notes due October 1, 2020	1,750			1,750
	15% Fixed Senior Secured Second Lien Notes due April 1, 2021	336			336
15% Fixed Senior Secured Second Lien Notes due April 1, 2021, Series B	1,235			1,235
10.25% Fixed Senior Notes due November 1, 2015 (a)	1,833			1,833
10.25% Fixed Senior Notes due November 1, 2015, Series B (a)	1,292			1,292
10.50% / 11.25% Senior Toggle Notes due November 1, 2016	1,749			1,749
Pollution Control Revenue Bonds:
Brazos River Authority:
5.40% Fixed Series 1994A due May 1, 2029	39			39
7.70% Fixed Series 1999A due April 1, 2033	111			111
7.70% Fixed Series 1999C due March 1, 2032	50			50
8.25% Fixed Series 2001A due October 1, 2030	71			71
8.25% Fixed Series 2001D-1 due May 1, 2033	171			171
6.30% Fixed Series 2003B due July 1, 2032	39			39
6.75% Fixed Series 2003C due October 1, 2038	52			52
5.40% Fixed Series 2003D due October 1, 2029	31			31
5.00% Fixed Series 2006 due March 1, 2041	100			100
Sabine River Authority of Texas:
6.45% Fixed Series 2000A due June 1, 2021	51			51
5.20% Fixed Series 2001C due May 1, 2028	70			70
5.80% Fixed Series 2003A due July 1, 2022	12			12
6.15% Fixed Series 2003B due August 1, 2022	45			45
Trinity River Authority of Texas:
6.25% Fixed Series 2000A due May 1, 2028	14			14
Unamortized fair value discount related to pollution control revenue bonds (b)	(103		)	(103		)
Other:
Other	1			1
Unamortized discount	(91		)	(91		)
Total TCEH	31,474			31,474
Deferred debt issuance and extension costs	(733		)	(733		)
Total EFH Corp. consolidated notes, loans and other debt	$	34,679		$	35,124
___________
(a)	Excludes the following principal amounts of debt held by EFIH or EFH Corp. (parent entity) and eliminated in consolidation.
	March 31,			December 31,
	2015			2014
EFH Corp. 5.55% Fixed Series P Senior Notes due November 15, 2014	$	281		$	281
EFH Corp. 6.50% Fixed Series Q Senior Notes due November 15, 2024	545			545
EFH Corp. 6.55% Fixed Series R Senior Notes due November 15, 2034	456			456
TCEH Floating Rate Term Loan Facilities due October 10, 2017	19			19
TCEH 10.25% Fixed Senior Notes due November 1, 2015	213			213
TCEH 10.25% Fixed Senior Notes due November 1, 2015, Series B	150			150
Total	$	1,664		$	1,664
(b)	Amount represents unamortized fair value adjustments recorded under purchase accounting.

Equity_Tables

Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Stockholders' Equity Note [Abstract]
Schedule of Stockholders Equity	The following table presents the changes to equity for the three months ended March 31, 2015:
		EFH Corp. Shareholders’ Equity
		Common Stock (a)			Additional Paid-in Capital			Retained Earnings (Deficit)			Accumulated Other Comprehensive Income (Loss)			Noncontrolling Interests			Total Equity
	Balance at December 31, 2014	$	2		$	7,968		$	(27,563	)	$	(130	)	$	—		$	(19,723	)
	Net loss	—			—			(1,527		)	—			—			(1,527		)
	Change in unrecognized losses related to pension and OPEB plans	—			—			—			(2		)	—			(2		)
	Net effects of cash flow hedges	—			—			—			1			—			1
	Net effects related to Oncor	—			—			—			1			—			1
	Balance at March 31, 2015	$	2		$	7,968		$	(29,090	)	$	(130	)	$	—		$	(21,250	)
	____________
	(a)	Authorized shares totaled 2,000,000,000 at March 31, 2015. Outstanding shares totaled 1,669,861,379 and 1,669,861,379 at March 31, 2015 and December 31, 2014, respectively.
	The following table presents the changes to equity for the three months ended March 31, 2014:
		EFH Corp. Shareholders’ Equity
		Common Stock (a)			Additional Paid-in Capital			Retained Earnings (Deficit)			Accumulated Other Comprehensive Income (Loss)			Noncontrolling Interests			Total Equity
	Balance at December 31, 2013	$	2		$	7,962		$	(21,157	)	$	(63	)	$	1		$	(13,255	)
	Net loss	—			—			(609		)	—			—			(609		)
	Effects of stock-based incentive compensation plans	—			2			—			—			—			2
	Change in unrecognized losses related to pension and OPEB plans	—			—			—			(1		)	—			(1		)
	Investment by noncontrolling interests	—			—			—			—			1			1
	Other	—			—			—			—			(2		)	(2		)
	Balance at March 31, 2014	$	2		$	7,964		$	(21,766	)	$	(64	)	$	—		$	(13,864	)
	____________
	(a)	Authorized shares totaled 2,000,000,000 at March 31, 2014. Outstanding shares totaled 1,669,861,383 and 1,669,861,383 at March 31, 2014 and December 31, 2013, respectively.
Schedule of Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)
	The following table presents the changes to accumulated other comprehensive income (loss) for the three months ended March 31, 2015. There was no other comprehensive income (loss) before reclassification for the period.
		Dedesignated Cash Flow Hedges – Interest Rate Swaps (Note 14)			Pension and Other Postretirement Employee Benefit Liabilities Adjustments			Accumulated Other Comprehensive Income (Loss)
	Balance at December 31, 2014	$	(53	)	$	(77	)	$	(130	)
	Amounts reclassified from accumulated other comprehensive income (loss) and reported in:
	Operating costs	—			(1		)	(1		)
	Depreciation and amortization	1			—			1
	Selling, general and administrative expenses	—			(1		)	(1		)
	Income tax benefit (expense)	—			—			—
	Equity in earnings of unconsolidated subsidiaries (net of tax)	1			—			1
	Total amount reclassified from accumulated other comprehensive income (loss) during the period	2			(2		)	—
	Balance at March 31, 2015	$	(51	)	$	(79	)	$	(130	)
	The following table presents the changes to accumulated other comprehensive income (loss) for the three months ended March 31, 2014. There was no other comprehensive income (loss) before reclassification for the period.
		Dedesignated Cash Flow Hedges – Interest Rate Swaps (Note 14)			Pension and Other Postretirement Employee Benefit Liabilities Adjustments			Accumulated Other Comprehensive Income (Loss)
	Balance at December 31, 2013	$	(56	)	$	(7	)	$	(63	)
	Amounts reclassified from accumulated other comprehensive income (loss) and reported in:
	Operating costs	—			(1		)	(1		)
	Depreciation and amortization	(1		)	—			(1		)
	Selling, general and administrative expenses	—			(1		)	(1		)
	Interest expense and related charges	1			—			1
	Income tax benefit (expense)	—			1			1
	Total amount reclassified from accumulated other comprehensive income (loss) during the period	—			(1		)	(1		)
	Balance at March 31, 2014	$	(56	)	$	(8	)	$	(64	)

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value on a recurring basis	Assets and liabilities measured at fair value on a recurring basis consisted of the following:
	March 31, 2015
		Level 1			Level 2				Level 3 (a)				Total
	Assets:
	Commodity contracts	$	361		$	54			$	69			$	484
	Nuclear decommissioning trust – equity securities (b)	378			219				—				597
	Nuclear decommissioning trust – debt securities (b)	—			308				—				308
	Total assets	$	739		$	581			$	69			$	1,389
	Liabilities:
	Commodity contracts	$	173		$	22			$	9			$	204
	Total liabilities	$	173		$	22			$	9			$	204
	December 31, 2014
		Level 1			Level 2				Level 3 (a)				Total
	Assets:
	Commodity contracts	$	402		$	46			$	49			$	497
	Nuclear decommissioning trust – equity securities (b)	375			217				—				592
	Nuclear decommissioning trust – debt securities (b)	—			301				—				301
	Total assets	$	777		$	564			$	49			$	1,390
	Liabilities:
	Commodity contracts	$	278		$	25			$	14			$	317
	Total liabilities	$	278		$	25			$	14			$	317
	____________
	(a)	See table below for description of Level 3 assets and liabilities.
	(b)	The nuclear decommissioning trust investment is included in the other investments line in the condensed consolidated balance sheets. See Note 17.
Schedule of fair value of the Level 3 assets and liabilities by major contract type (all related to commodity contracts) and the significant unobservable inputs used in the valuations	The following tables present the fair value of the Level 3 assets and liabilities by major contract type and the significant unobservable inputs used in the valuations at March 31, 2015 and December 31, 2014:
	March 31, 2015
			Fair Value
	Contract Type (a)		Assets			Liabilities				Total				Valuation Technique	Significant Unobservable Input	Range (b)
	Electricity purchases and sales		$	11		$	(2	)		$	9			Valuation Model	Illiquid pricing locations (c)	$25 to $45/ MWh
															Hourly price curve shape (d)	$20 to $60/ MWh
	Electricity spread options		4			(2		)		2				Option Pricing Model	Gas to power correlation (e)	20% to 95%
															Power volatility (f)	10% to 30%
	Electricity congestion revenue rights		42			(3		)		39				Market Approach (g)	Illiquid price differences between settlement points (h)	$0.00 to $20.00
	Coal purchases		—			(2		)		(2		)		Market Approach (g)	Illiquid price variances between heat content (j)	$0.00 to $0.50
	Other (k)		12			—				12
	Total		$	69		$	(9	)		$	60
	December 31, 2014
			Fair Value
	Contract Type (a)		Assets			Liabilities				Total				Valuation Technique	Significant Unobservable Input	Range (b)
	Electricity purchases and sales		$	4		$	(5	)		$	(1	)		Valuation Model	Illiquid pricing locations (c)	$30 to $50/ MWh
															Hourly price curve shape (d)	$20 to $70/ MWh
	Electricity spread options		2			(1		)		1				Option Pricing Model	Gas to power correlation (e)	15% to 95%
															Power volatility (f)	10% to 30%
	Electricity congestion revenue rights		38			(4		)		34				Market Approach (g)	Illiquid price differences between settlement points (h)	$0.00 to $20.00
	Coal purchases		—			(4		)		(4		)		Market Approach (g)	Illiquid price variances between mines (i)	$0.00 to $1.00
															Illiquid price variances between heat content (j)	$0.30 to $0.40
	Other (k)		5			—				5
	Total		$	49		$	(14	)		$	35
	____________
	(a)	Electricity purchase and sales contracts include hedging positions in the ERCOT regions, as well as power contracts, the valuations of which include unobservable inputs related to the hourly shaping of the price curve. Electricity spread option contracts consist of physical electricity call options. Electricity congestion revenue rights contracts consist of forward purchase contracts (swaps and options) used to hedge electricity price differences between settlement points within ERCOT. Coal purchase contracts relate to western (Powder River Basin) coal.
	(b)	The range of the inputs may be influenced by factors such as time of day, delivery period, season and location.
	(c)	Based on the historical range of forward average monthly ERCOT hub and load zone prices.
	(d)	Based on the historical range of forward average hourly ERCOT North Hub prices.
	(e)	Estimate of the historical range based on forward natural gas and on-peak power prices for the ERCOT hubs most relevant to our spread options.
	(f)	Based on historical forward price changes.
	(g)	While we use the market approach, there is either insufficient market data to consider the valuation liquid or the significance of credit reserves or non-performance risk adjustments results in a Level 3 designation.
	(h)	Based on the historical price differences between settlement points within the ERCOT hubs and load zones.
	(i)	Based on the historical range of price variances between mine locations.
	(j)	Based on historical ranges of forward average prices between different heat contents (potential energy in coal for a given mass).
	(k)	Other includes contracts for ancillary services, natural gas, diesel options, coal options and weather dependent power options.
Schedule of changes in fair value of the Level 3 assets and liabilities (all related to commodity contracts)	The following table presents the changes in fair value of the Level 3 assets and liabilities for the three months ended March 31, 2015 and 2014.
		Three Months Ended March 31,
		2015			2014
	Net asset (liability) balance at beginning of period	$	35		$	(973	)
	Total unrealized valuation gains (losses)	16			(85		)
	Purchases, issuances and settlements (a):
	Purchases	19			9
	Issuances	(3		)	(1		)
	Settlements	(8		)	151
	Transfers into Level 3 (b)	—			—
	Transfers out of Level 3 (b)	1			2
	Net change (c)	25			76
	Net asset (liability) balance at end of period	$	60		$	(897	)
	Unrealized valuation gains (losses) relating to instruments held at end of period	$	15		$	(71	)
	____________
	(a)	Settlements reflect reversals of unrealized mark-to-market valuations previously recognized in net income. Purchases and issuances reflect option premiums paid or received.
	(b)	Includes transfers due to changes in the observability of significant inputs. Transfers in and out occur at the end of each quarter, which is when the assessments are performed. All Level 3 transfers during the periods presented are in and out of Level 2.
	(c)	Substantially all changes in values of commodity contracts are reported in the condensed statements of consolidated income (loss) in net gain (loss) from commodity hedging and trading activities. Activity excludes changes in fair value in the month the positions settled as well as amounts related to positions entered into and settled in the same month.

Commodity_And_Other_Derivative1

Commodity And Other Derivative Contractual Assets And Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Commodity and Other Derivative Contractual Assets and Liabilities as Reported in the Balance Sheets	The following tables provide detail of commodity and other derivative contractual assets and liabilities (with the column totals representing the net positions of the contracts) as reported in the condensed consolidated balance sheets at March 31, 2015 and December 31, 2014. All amounts relate to commodity contracts.
		March 31, 2015								December 31, 2014
		Derivative				Derivative Liabilities				Derivative				Derivative Liabilities
		Assets								Assets
	Current assets	$	466			$	—			$	492			$	—
	Noncurrent assets	18				—				5				—
	Current liabilities	—				(202		)		—				(316		)
	Noncurrent liabilities	—				(2		)		—				(1		)
	Net assets (liabilities)	$	484			$	(204	)		$	497			$	(317	)
Schedule of Pre-tax Effect on Net Income of Derivatives Not Under Hedge Accounting, Including Realized and Unrealized Effects	The following table presents the pretax effect of derivatives on net income (gains (losses)), including realized and unrealized effects:
			Three Months Ended March 31,
	Derivative (condensed statements of consolidated income (loss) presentation)		2015				2014
	Commodity contracts (Net gain (loss) from commodity hedging and trading activities) (a)		$	125			$	(179	)
	Interest rate swaps (Interest expense and related charges) (b)		—				(82		)
	Net gain (loss)		$	125			$	(261	)
	____________
	(a)	Amount represents changes in fair value of positions in the derivative portfolio during the period, as realized amounts related to positions settled are assumed to equal reversals of previously recorded unrealized amounts.
	(b)	Includes unrealized mark-to-market net gain (loss) as well as the net realized effect on interest paid/accrued, both reported in Interest Expense and Related Charges (see Note 7).
Offsetting Assets and Liabilities	The following tables reconcile our derivative assets and liabilities as presented in the condensed consolidated balance sheets to net amounts after taking into consideration netting arrangements with counterparties and financial collateral:
	March 31, 2015
			Amounts Presented in Balance Sheet				Offsetting Instruments (a)				Financial Collateral (Received) Pledged (b)				Net Amounts
	Derivative assets:
	Commodity contracts		$	484			$	(195	)		$	(93	)		$	196
	Derivative liabilities:
	Commodity contracts		(204		)		195				1				(8		)
	Net amounts		$	280			$	—			$	(92	)		$	188
	December 31, 2014
			Amounts Presented in Balance Sheet				Offsetting Instruments (a)				Financial Collateral (Received) Pledged (b)				Net Amounts
	Derivative assets:
	Commodity contracts		$	497			$	(298	)		$	(16	)		$	183
	Derivative liabilities:
	Commodity contracts		(317		)		298				2				(17		)
	Net amounts		$	180			$	—			$	(14	)		$	166
	____________
	(a)	Amounts presented exclude trade accounts receivable and payable related to settled financial instruments.
	(b)	Financial collateral consists entirely of cash margin deposits.
Schedule of Gross Notional Amounts of Derivative Volumes	The following table presents the gross notional amounts of derivative volumes at March 31, 2015 and December 31, 2014:
			March 31, 2015			December 31, 2014
	Derivative type		Notional Volume						Unit of Measure
	Natural gas (a)		2,115			1,687			Million MMBtu
	Electricity		30,814			22,820			GWh
	Congestion Revenue Rights (b)		89,637			89,484			GWh
	Coal		8			10			Million US tons
	Fuel oil		38			36			Million gallons
	Uranium		252			150			Thousand pounds
	____________
	(a)	Represents gross notional forward sales, purchases and options transactions, locational basis swaps and other natural gas transactions.
	(b)	Represents gross forward purchases associated with instruments used to hedge electricity price differences between settlement points within ERCOT.

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Schedule of segment reporting information, by segment
		Three Months Ended March 31,
		2015			2014
	Operating revenues (all Competitive Electric)	$	1,272		$	1,517
	Equity in earnings of unconsolidated subsidiaries (net of tax) — Regulated Delivery (net of noncontrolling interests of $20 and $21)	$	75		$	80
	Net income (loss):
	Competitive Electric	$	(1,336	)	$	(567	)
	Regulated Delivery	75			80
	Corporate and Other	(266		)	(122		)
	Consolidated net loss	$	(1,527	)	$	(609	)

Supplementary_Financial_Inform1

Supplementary Financial Information (Tables)	3 Months Ended
	Mar. 31, 2015
Supplementary Financial Information [Abstract]
Schedule of other income and deductions	Other Income and Deductions
		Three Months Ended March 31,
		2015			2014
	Other income:
	Office space rental income (a)	$	3		$	3
	Mineral rights royalty income (b)	1			1
	All other	4			5
	Total other income	$	8		$	9
	Other deductions:
	Impairment of favorable purchase contracts (Note 4) (b)	$	8		$	—
	Impairment of emission allowances (Note 4) (b)	51			—
	All other	1			—
	Total other deductions	$	60		$	—
	____________
	(a)	Reported in Corporate and Other.
	(b)	Reported in Competitive Electric segment.
Schedule of Interest Expense and Related Charges [Table Text Block]
		Three Months Ended March 31,
		2015			2014
	Interest paid/accrued on debtor-in-possession financing	$	73		$	—
	Adequate protection amounts paid/accrued (a)	302			—
	Interest paid/accrued on pre-petition debt (b)	237			831
	Interest expense on pre-petition toggle notes payable in additional principal (Note 10)	—			49
	Unrealized mark-to-market net gain on interest rate swaps	—			(65		)
	Amortization of interest rate swap losses at dedesignation of hedge accounting	—			(1		)
	Amortization of fair value debt discounts resulting from purchase accounting	—			5
	Amortization of debt issuance, amendment and extension costs and discounts	—			51
	Capitalized interest	(3		)	(7		)
	Total interest expense and related charges	$	609		$	863
	____________
	(a)	Post-petition period only.
	(b)	For the three months ended March 31, 2015, amounts include $235 million in post-petition interest related to the EFIH Second Lien Notes (see Note 10). Includes amounts related to interest rate swaps totaling zero and $146 million for the three months ended March 31, 2015 and 2014, respectively.
Schedule of restricted cash	Restricted Cash
		March 31, 2015						December 31, 2014
		Current			Noncurrent Assets			Current			Noncurrent Assets
		Assets						Assets
	Amounts related to TCEH's DIP Facility (Note 9)	$	—		$	367		$	—		$	350
	Amounts related to TCEH's pre-petition Letter of Credit	—			506			—			551
	Facility (Note 10) (a)
	Other	6			—			6			—
	Total restricted cash	$	6		$	873		$	6		$	901
	____________
	(a)
Schedule of accounts, notes, loans and financing receivable [Table Text Block]	Allowance for Uncollectible Accounts Receivable
		Three Months Ended March 31,
		2015			2014
	Allowance for uncollectible accounts receivable at beginning of period	$	15		$	14
	Increase for bad debt expense	9			10
	Decrease for account write-offs	(9		)	(7		)
	Allowance for uncollectible accounts receivable at end of period	$	15		$	17
	Trade Accounts Receivable
		March 31,			December 31,
		2015			2014
	Wholesale and retail trade accounts receivable	$	554		$	604
	Allowance for uncollectible accounts	(15		)	(15		)
	Trade accounts receivable — net	$	539		$	589
	Gross trade accounts receivable at March 31, 2015 and December 31, 2014 included unbilled revenues of $198 million and $239 million, respectively.
Schedule of inventories by major category	Inventories by Major Category
		March 31,			December 31,
		2015			2014
	Materials and supplies	$	215		$	214
	Fuel stock	230			215
	Natural gas in storage	25			39
	Total inventories	$	470		$	468
Summary of other investments	Other Investments
		March 31,			December 31,
		2015			2014
	Nuclear plant decommissioning trust	$	905		$	893
	Assets related to employee benefit plans, including employee savings programs, net of distributions	62			61
	Land	36			37
	Miscellaneous other	4			4
	Total other investments	$	1,007		$	995
Summary of investments in the fund	The nuclear decommissioning trust fund is not a debtor under the Chapter 11 Cases. A summary of investments in the fund follows:
		March 31, 2015
		Cost (a)			Unrealized gain			Unrealized loss			Fair market
											value
	Debt securities (b)	$	295		$	13		$	—		$	308
	Equity securities (c)	281			321			(5		)	597
	Total	$	576		$	334		$	(5	)	$	905
		December 31, 2014
		Cost (a)			Unrealized gain			Unrealized loss			Fair market
											value
	Debt securities (b)	$	288		$	13		$	—		$	301
	Equity securities (c)	276			320			(4		)	592
	Total	$	564		$	333		$	(4	)	$	893
	____________
	(a)	Includes realized gains and losses on securities sold.
	(b)	The investment objective for debt securities is to invest in a diversified tax efficient portfolio with an overall portfolio rating of AA or above as graded by S&P or Aa2 by Moody's Investors Services, Inc. The debt securities are heavily weighted with municipal bonds. The debt securities had an average coupon rate of 4.32% and 4.35% at March 31, 2015 and December 31, 2014, respectively, and an average maturity of 6 years at both March 31, 2015 and December 31, 2014.
	(c)	The investment objective for equity securities is to invest tax efficiently and to match the performance of the S&P 500 Index.
Summary of proceeds from sales of available-for-sale securities and the related realized gains and losses from such sales	The following table summarizes proceeds from sales of available-for-sale securities and the related realized gains and losses from such sales.
		Three Months Ended March 31,
		2015			2014
	Realized gains	$	—		$	1
	Realized losses	$	(1	)	$	—
	Proceeds from sales of securities	$	23		$	33
	Investments in securities	$	(27	)	$	(37	)
Schedule of asset retirement and mining reclamation obligations	The following table summarizes the changes to these obligations, reported in other current liabilities and other noncurrent liabilities and deferred credits in the condensed consolidated balance sheets, for the three months ended March 31, 2015:
		Nuclear Plant Decommissioning			Mining Land Reclamation			Other			Total
	Liability at December 31, 2014	$	413		$	165		$	36		$	614
	Additions:
	Accretion	6			5			1			12
	Reductions:
	Payments	—			(14		)	—			(14		)
	Liability at March 31, 2015	419			156			37			612
	Less amounts due currently	—			(58		)	—			(58		)
	Noncurrent liability at March 31, 2015	$	419		$	98		$	37		$	554
Schedule of other noncurrent liabilities and deferred credits	Other Noncurrent Liabilities and Deferred Credits
	The balance of other noncurrent liabilities and deferred credits consists of the following:
		March 31,			December 31,
		2015			2014
	Uncertain tax positions, including accrued interest	$	75		$	74
	Retirement plan and other employee benefits (a)	244			243
	Asset retirement and mining reclamation obligations	554			560
	Unfavorable purchase and sales contracts	560			566
	Nuclear decommissioning fund excess over asset retirement obligation (Note 15)	485			479
	Other	181			155
	Total other noncurrent liabilities and deferred credits	$	2,099		$	2,077
	____________
	(a)	Includes $47 million at both March 31, 2015 and December 31, 2014, representing pension liabilities related to Oncor (see Note 15).
Schedule of estimated amortization of unfavorable purchase and sales contracts for each of the next five fiscal years	The estimated amortization of unfavorable purchase and sales contracts for each of the next five fiscal years is as follows:
	Year		Amount
	2015		$	24
	2016		$	24
	2017		$	24
	2018		$	24
	2019		$	24
Schedule of fair value of debt	Fair Value of Debt
			March 31, 2015						December 31, 2014
	Debt:		Carrying Amount			Fair			Carrying Amount			Fair
						Value						Value
	Borrowings under debtor-in-possession credit facilities (Note 9)		$	6,825		$	6,852		$	6,825		$	6,830
	Pre-petition notes, loans and other debt reported as liabilities subject to compromise (Note 10)		$	35,411		$	19,633		$	35,857		$	21,411
	Long-term debt not subject to compromise, excluding capital lease obligations (Note 9)		$	114		$	115		$	123		$	119
Schedule of supplemental cash flow information	Supplemental Cash Flow Information
		Three Months Ended March 31,
		2015			2014
	Cash payments related to:
	Interest paid (a)	$	671		$	622
	Capitalized interest	(3		)	(7		)
	Interest paid (net of capitalized interest) (a)	$	668		$	615
	Income taxes	$	—		$	—
	Reorganization items (b)	$	89		$	—
	Noncash investing and financing activities:
	Construction expenditures (c)	$	65		$	30
	____________
	(a)	Net of amounts received under interest rate swap agreements. For the three months ended March 31, 2015, this amount also includes amounts paid for adequate protection.
	(b)	Represents cash payments for legal and other consulting services.
	(c)	Represents end-of-period accruals.

Business_And_Significant_Accou2

Business And Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2015	Nov. 30, 2008
	Reportable_segment
Business and Significant Accounting Policies
Number of reportable segments (in reportable segments)	2
Equity method investment, Maximum ownership percentage for accounting treatment (as a percent)	50.00%
Oncor [Member]
Business and Significant Accounting Policies
Sale of equity ownership interest (as a percent)		19.75%
Energy Future Intermediate Holding CO LLC [Member] | Oncor [Member]
Business and Significant Accounting Policies
Equity method investment, ownership (as a percent)	80.00%

Chapter_11_Cases_Chapter_11_Ca

Chapter 11 Cases (Chapter 11 Cases) (Details) (USD $)	3 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Apr. 30, 2015	7-May-15
Schedule of Reorganization Costs [Line Items]
Debtor Reorganization Items, Net Gain (Loss) on Rejection of Leases and Other Executory Contracts	($32)	$0
Subsequent Event [Member]
Schedule of Reorganization Costs [Line Items]
Bankruptcy Claims Number Of Claims Settled, Withdrawn or Expunged By Bankruptcy Court				4,000
Bankruptcy Claims, Number of Claims under Review by Management				10,000
Texas Competitive Electric Holdings Company LLC [Member] | Senior Secured Debt [Member] | Subsequent Event [Member]
Schedule of Reorganization Costs [Line Items]
Reorganization Plan, Common Stock of Reorganized Entity Debtholders To Receive			100.00%
Reorganization Plan, Proceeds From Reorganized Entity Stock Debholders To Receive			100.00%

Variable_Interest_Entities_Onc

Variable Interest Entities (Oncor Holdings and Distributions from Oncor Holdings) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated subsidiary	$6,060		$6,058
Distributions of earnings from unconsolidated subsidiaries	74	37
Oncor [Member] | Energy Future Intermediate Holding CO LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership (as a percent)	80.00%
Oncor [Member] | Oncor Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of equity method investment consolidated revenues related to services provided to entity (as a percent)	25.00%	26.00%
Oncor Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Distributions of earnings from unconsolidated subsidiaries	74	37
Eligible distributions after accounting for regulatory restrictions	$37
PUCT required regulatory capitalization, ratio of debt to equity, debt (as a percent)	60.00%
PUCT required regulatory capitalization, ratio of debt to equity, equity (as a percent)	40.00%
Regulatory capitalization, ratio of debt to equity, debt (as a percent)	59.80%
Regulatory capitalization, ratio of debt to equity, equity (as a percent)	40.20%

Variable_Interest_Entities_Onc1

Variable Interest Entities (Oncor Holdings Financial Statements) (Details) (Oncor Holdings [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Oncor Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Operating revenues	$946	$917
Operation and maintenance expenses	-380	-345
Depreciation and amortization	-217	-210
Taxes other than income taxes	-111	-108
Other income	2	4
Other deductions	-4	-3
Interest income	1	1
Interest expense and related charges	-81	-88
Income before income taxes	156	168
Income tax expense	-61	-67
Net income	95	101
Net income attributable to noncontrolling interests	-20	-21
Net income attributable to Oncor Holdings	75	80
Current assets:
Cash and cash equivalents	18		5
Restricted cash	58		56
Trade accounts receivable — net	417		407
Trade accounts and other receivables from affiliates	128		118
Income taxes receivable from EFH Corp.	80		144
Inventories	79		73
Accumulated deferred income taxes	10		10
Prepayments and other current assets	92		91
Total current assets	882		904
Restricted cash	16		16
Other investments	97		97
Property, plant and equipment — net	12,626		12,463
Goodwill	4,064		4,064
Regulatory assets — net	1,349		1,429
Other noncurrent assets	71		67
Total assets	19,105		19,040
Current liabilities:
Short-term borrowings	800		711
Long-term debt due currently	109		639
Trade accounts payable — nonaffiliates	158		202
Income taxes payable to EFH Corp.	31		24
Accrued taxes other than income	66		174
Accrued interest	56		93
Other current liabilities	117		156
Total current liabilities	1,337		1,999
Accumulated deferred income taxes	1,949		1,978
Long-term debt, less amounts due currently	5,720		4,997
Other noncurrent liabilities and deferred credits	2,260		2,245
Total liabilities	$11,266		$11,219

Goodwill_And_Identifiable_Inta2

Goodwill And Identifiable Intangible Assets (Goodwill) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 01, 2014
Goodwill [Line Items]
Balance, goodwill	$1,652		$2,352
Impairment of goodwill (Note 4)	700	0
Discount rate Applied to Internally Developed Cash Flow Projections	6.00%			6.25%
Competitive Electric [Member]
Goodwill [Line Items]
Goodwill before impairment charges			18,342
Accumulated noncash impairment charges	-16,690		-15,990
Balance, goodwill	1,652		2,352
Impairment of goodwill (Note 4)	700
Goodwill, Period Increase (Decrease)		0
Goodwill, Expected Tax Deductible Amount	$0
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	34.00%			17.00%

Goodwill_And_Identifiable_Inta3

Goodwill And Identifiable Intangible Assets (Identifiable Intangible Assets Reported in the Balance Sheet) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Finite-Lived and Indefinite-Lived Intangible [Line Items]
Gross Carrying Amount	$877			$1,285
Accumulated Amortization	639			932
Total identifiable intangible assets subject to amortization, net	238			353
Total identifiable intangible assets	1,199			1,315
Retail trade name (not subject to amortization) [Member]
Finite-Lived and Indefinite-Lived Intangible [Line Items]
Gross Carrying Amount, Unamortized Intangibles	955			955
Mineral interests (not currently subject to amortization) [Member]
Finite-Lived and Indefinite-Lived Intangible [Line Items]
Gross Carrying Amount, Unamortized Intangibles	6			7
Retail customer relationship [Member]
Finite-Lived and Indefinite-Lived Intangible [Line Items]
Gross Carrying Amount	463			463
Accumulated Amortization	429			425
Total identifiable intangible assets subject to amortization, net	34			38
Favorable purchase and sales contracts [Member]
Finite-Lived and Indefinite-Lived Intangible [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	8	[1]	0
Capitalized in-service software [Member]
Finite-Lived and Indefinite-Lived Intangible [Line Items]
Gross Carrying Amount	346			362
Accumulated Amortization	203			216
Total identifiable intangible assets subject to amortization, net	143			146
Environmental allowances and credits [Member]
Finite-Lived and Indefinite-Lived Intangible [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	51	[1]	0
Other Identifiable Intangible Assets [Member]
Finite-Lived and Indefinite-Lived Intangible [Line Items]
Gross Carrying Amount	68	[2]		460
Accumulated Amortization	7	[2]		291
Total identifiable intangible assets subject to amortization, net	$61	[2]		$169
[1]	Reported in Competitive Electric segment.
[2]	See discussion below regarding impairment charges recorded in the three months ended March 31, 2015 related to other identifiable intangible assets.

Goodwill_And_Identifiable_Inta4

Goodwill And Identifiable Intangible Assets (Amortization Expense Related to Intangible Assets (including income statement line item)) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$20	[1]	$35	[1]
Depreciation and amortization [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	15		25
Retail customer relationship [Member] | Depreciation and amortization [Member] | Competitive Electric [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	4		6
Capitalized in-service software [Member] | Depreciation and amortization [Member] | Competitive Electric and Corporate and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	11		11
Other Identifiable Intangible Assets [Member] | Operating Revenues, Fuel, Purchased Power Costs And Delivery Fees, Depreciation And Amortization [Member] | Competitive Electric [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$5		$18
[1]	Amounts recorded in depreciation and amortization totaled $15 million and $25 million for the three months ended March 31, 2015 and 2014, respectively.

Goodwill_And_Identifiable_Inta5

Goodwill And Identifiable Intangible Assets (Estimated Amortization of Identifiable Intangible Assets) (Details) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Estimated Amortization Expense
2015	$73
2016	59
2017	46
2018	26
2019	$12

Income_Taxes_Calculation_of_Ef

Income Taxes (Calculation of Effective Tax Rate)(Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Loss before income taxes and equity in earnings of unconsolidated subsidiaries	($2,003)	($1,049)
Income tax benefit	($401)	($360)
Effective tax rate	20.00%	34.30%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%

Impairment_of_LongLived_Assets1

Impairment of Long-Lived Assets (Impairment of Long-Lived Assets)(Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets (Note 6)	$676	$0
Big Brown Steam Electric Station [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets (Note 6)	$676

Interest_Expense_and_Related_C2

Interest Expense and Related Charges (Interest Expense and Related Charges) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Interest Expense and Related Charges [Line Items]
Interest paid/accrued on debtor-in-possession financing	$73		$0
Adequate protection amounts paid/accrued	302	[1]	0
Interest paid/accrued on pre-petition debt	237	[2]	831	[2]
Interest expense on pre-petition toggle notes payable in additional principal	0		49
Unrealized mark-to-market net gain on interest rate swaps	0		-65
Amortization of interest rate swap losses at dedesignation of hedge accounting	0		-1
Amortization of fair value debt discounts resulting from purchase accounting	0		5
Amortization of debt issuance, amendment and extension costs and discounts	0		51
Capitalized interest	-3		-7
Total interest expense and related charges	609		863
Liabilities Subject To Compromise, Debt	34,679				35,124
Net liability under terminated TCEH interest rate swap and natural gas hedging agreements	1,235				1,235
Energy Future Intermediate Holding CO LLC [Member]
Interest Expense and Related Charges [Line Items]
Liabilities Subject To Compromise, Debt	3,401				3,846
Texas Competitive Electric Holdings Company LLC [Member]
Interest Expense and Related Charges [Line Items]
Liabilities Subject To Compromise, Debt	31,474				31,474
Interest Rate Swap [Member]
Interest Expense and Related Charges [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	0		146
Senior Secured Debt [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Interest Expense and Related Charges [Line Items]
Liabilities Subject To Compromise, Debt	1,571
Line of Credit [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Interest Expense and Related Charges [Line Items]
Liabilities Subject To Compromise, Debt	22,616
Fixed Senior Secured Second Lien 11% Notes and Fixed Senior Secured Second Lien 11.75% Notes [Member] [Member] | Senior Secured Debt [Member] | Energy Future Intermediate Holding CO LLC [Member]
Interest Expense and Related Charges [Line Items]
Interest paid/accrued on pre-petition debt	235
11.5% Fixed Senior Secured Notes due October 1, 2020 [Member] | Senior Secured Debt [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Interest Expense and Related Charges [Line Items]
Liabilities Subject To Compromise, Debt	$1,750				$1,750
Adequate Protection Interest Expense [Member]
Interest Expense and Related Charges [Line Items]
Adequate Protection Paid Or Accrued, Weighted Average Interest Rate	4.67%
Debt Instrument, Basis Spread on Variable Rate	4.50%
[1]	Post-petition period only.
[2]	For the three months ended March 31, 2015, amounts include $235 million in post-petition interest related to the EFIH Second Lien Notes (see Note 10). Includes amounts related to interest rate swaps totaling zero and $146 million for the three months ended March 31, 2015 and 2014, respectively.

Interest_Expense_and_Related_C3

Interest Expense and Related Charges (Contractual Interest Expense on Pre-Petition Liabilities) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Contractual Interest Expense On Pre-Petition Liabilities [Line Items]
Contractual Interest Expense On Pre-Petition Liabilities Classified As Liabilities Subject To Compromise	$626
Interest Expense On Prepetition Liabilities Recognized In Statement of Operations, Adequate Protection Paid Or Accrued	288
Interest Expense On Prepetition Liabilities Recognized In Statement Of Operations, Paid or Accrued Amounts Allowed On Notes Exchanged-Settled-Repaid	50	[1]
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations	288
Adequate Protection Interest Paid-Accrued, Amount Excluded Related To Terminated Natural Gas Hedging Positions And Interest Rate Swaps	14
Post-Petition Interest Related to Prior Periods Paid And Accrued On Pre-Petition Debt	185
EFH Corp. [Member]
Contractual Interest Expense On Pre-Petition Liabilities [Line Items]
Contractual Interest Expense On Pre-Petition Liabilities Classified As Liabilities Subject To Compromise	31
Interest Expense On Prepetition Liabilities Recognized In Statement of Operations, Adequate Protection Paid Or Accrued	0
Interest Expense On Prepetition Liabilities Recognized In Statement Of Operations, Paid or Accrued Amounts Allowed On Notes Exchanged-Settled-Repaid	0
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations	31
Energy Future Intermediate Holding CO LLC [Member]
Contractual Interest Expense On Pre-Petition Liabilities [Line Items]
Contractual Interest Expense On Pre-Petition Liabilities Classified As Liabilities Subject To Compromise	111
Interest Expense On Prepetition Liabilities Recognized In Statement of Operations, Adequate Protection Paid Or Accrued	0
Interest Expense On Prepetition Liabilities Recognized In Statement Of Operations, Paid or Accrued Amounts Allowed On Notes Exchanged-Settled-Repaid	50	[1]
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations	61
Energy Future Competitive Holdings Company [Member]
Contractual Interest Expense On Pre-Petition Liabilities [Line Items]
Contractual Interest Expense On Pre-Petition Liabilities Classified As Liabilities Subject To Compromise	2
Interest Expense On Prepetition Liabilities Recognized In Statement of Operations, Adequate Protection Paid Or Accrued	0
Interest Expense On Prepetition Liabilities Recognized In Statement Of Operations, Paid or Accrued Amounts Allowed On Notes Exchanged-Settled-Repaid	0
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations	2
Texas Competitive Electric Holdings Company LLC [Member]
Contractual Interest Expense On Pre-Petition Liabilities [Line Items]
Contractual Interest Expense On Pre-Petition Liabilities Classified As Liabilities Subject To Compromise	513
Interest Expense On Prepetition Liabilities Recognized In Statement of Operations, Adequate Protection Paid Or Accrued	288
Interest Expense On Prepetition Liabilities Recognized In Statement Of Operations, Paid or Accrued Amounts Allowed On Notes Exchanged-Settled-Repaid	0
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations	225
Consolidation, Eliminations [Member]
Contractual Interest Expense On Pre-Petition Liabilities [Line Items]
Contractual Interest Expense On Pre-Petition Liabilities Classified As Liabilities Subject To Compromise	-31	[1]
Interest Expense On Prepetition Liabilities Recognized In Statement of Operations, Adequate Protection Paid Or Accrued	0
Interest Expense On Prepetition Liabilities Recognized In Statement Of Operations, Paid or Accrued Amounts Allowed On Notes Exchanged-Settled-Repaid	0
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations	($31)	[1]
[1]	Represents contractual interest on affiliate debt held by EFH Corp. and EFIH that is classified as liabilities subject to compromise.

Reorganization_Items_Reorganiz

Reorganization Items (Reorganization Items) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Reorganization Items [Line Items]
Expenses related to legal advisory and representation services	$50
Expenses related to other professional consulting and advisory services	28
Fees associated with repayment of EFIH Second Lien Notes (Note 10)	28
Contract rejection claims (Note 8)	32	0
Total reorganization items	$138	$0

DebtorInPossession_Borrowing_F2

Debtor-In-Possession Borrowing Facilities (TCEH Debtor-In-Possession Facility) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Line of Credit Facility [Line Items]
Debtor-in-Possession Financing, Borrowings Outstanding	$6,825,000,000		$6,825,000,000
Texas Competitive Electric Holdings Company LLC [Member] | Debtor-In-Possession Facility [Member]
Line of Credit Facility [Line Items]
Debtor-in-Possession Financing, Amount Arranged	3,375,000,000
Debtor-in-Possession Financing, Unused Cash Borrowings	1,950,000,000
Debtor-in-Possession Financing, Unused Letter of Credit Capacity	433,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	0.75%
Debt Instrument, Basis Spread on Variable Rate	3.00%
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding	3.75%
Debtor-in-Possession Financing, Extension Fee, Twenty-Fifth Through Thirtieth Month	0.25%
Consolidated Superpriority Secured Net Debt to Consolidated EBITDA Covenant Threshold	3.5
Texas Competitive Electric Holdings Company LLC [Member] | Debtor-In-Possession Facility [Member] | Senior Secured Super-Priority Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debtor-in-Possession Financing, Amount Arranged	1,950,000,000	[1]
Debtor-in-Possession Financing, Unused Cash Borrowings	1,950,000,000
Debtor-in-Possession Financing, Unused Letter of Credit Capacity	0
Debtor-in-Possession Financing, Borrowings Outstanding	0	[1]
Debtor-in-Possession Financing, Maximum Borrowings Allowed Without Consent Or Bankruptcy Court Order	1,650,000,000
Texas Competitive Electric Holdings Company LLC [Member] | Debtor-In-Possession Facility [Member] | Senior Secured Super-Priority Term Loan [Member]
Line of Credit Facility [Line Items]
Debtor-in-Possession Financing, Amount Arranged	1,425,000,000	[2]
Debtor-in-Possession Financing, Unused Cash Borrowings	0
Debtor-in-Possession Financing, Unused Letter of Credit Capacity	433,000,000
Debtor-in-Possession Financing, Borrowings Outstanding	1,425,000,000
Debtor-in-Possession Financing, Amount Arranged, Maximum Letter of Credit Capacity	800,000,000
Debtor-in-Possession Financing, Collateral Account, Total Amount Held To Support Letters Of Credit	800,000,000
Texas Competitive Electric Holdings Company LLC [Member] | Debtor-In-Possession Facility [Member] | Senior Secured Super-Priority Term Loan [Member] | Cash and Cash Equivalents [Member]
Line of Credit Facility [Line Items]
Debtor-in-Possession Financing, Collateral Account, Total Amount Held To Support Letters Of Credit	433,000,000
Texas Competitive Electric Holdings Company LLC [Member] | Debtor-In-Possession Facility [Member] | Senior Secured Super-Priority Term Loan [Member] | Other Restricted Cash [Member]
Line of Credit Facility [Line Items]
Debtor-in-Possession Financing, Collateral Account, Total Amount Held To Support Letters Of Credit	367,000,000
Railroad Commission of Texas [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Line of Credit Facility [Line Items]
Collateral Bond, Securing Mining Land Reclamation Obligations, Secured By First Lien Interest In Assets	$1,100,000,000
[1]	Facility used for general corporate purposes. No amounts were borrowed at March 31, 2015. Pursuant to an order of the Bankruptcy Court, the TCEH Debtors may not have more than $1.650 billion of TCEH DIP Revolving Credit Facility cash borrowings outstanding without written consent of the TCEH committee of unsecured creditors and the ad hoc group of TCEH unsecured noteholders or further order of the Bankruptcy Court.
[2]	Facility used for general corporate purposes, including but not limited to, $800 million for issuing letters of credit.

DebtorInPossession_Borrowing_F3

Debtor-In-Possession Borrowing Facilities (EFIH First-Lien Debtor-In-Possession Facility) (Details) (USD $)	3 Months Ended				1 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Interest paid/accrued on pre-petition debt	$237,000,000	[1]	$831,000,000	[1]
Cash and cash equivalents	2,437,000,000		733,000,000			3,428,000,000	1,217,000,000
Debtor-in-Possession Financing, Borrowings Outstanding	6,825,000,000					6,825,000,000
Energy Future Intermediate Holding CO LLC [Member]
Line of Credit Facility [Line Items]
Cash and cash equivalents	392,000,000
Energy Future Intermediate Holding CO LLC [Member] | First-Lien Debtor-in-Possession Facility [Member]
Line of Credit Facility [Line Items]
Debtor-in-Possession Financing, Extension Fee, Twenty-Fifth Through Thirtieth Month	0.25%
Debtor-In-Possession Financing, Incremental Junior Lien Debt Allowed, Maximum	3,000,000,000
Energy Future Intermediate Holding CO LLC [Member] | First-Lien Debtor-in-Possession Facility [Member] | Senior Secured Super-Priority First Lien Term Loan [Member]
Line of Credit Facility [Line Items]
Debtor-in-Possession Financing, Amount Arranged	5,400,000,000
Debtor-In-Possession Financing, Borrowings Used In Exchange Transaction For Pre-Petition Debt					1,836,000,000
Debtor-In-Possession Financing, Borrowings Used to Repay Pre-Petition Debt					2,438,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	1.00%
Debt Instrument, Basis Spread on Variable Rate	3.25%
Debtor-in-Possession Financing, Borrowings Outstanding	5,400,000,000
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding	4.25%
Debtor In Possession Financing, Liquidity Covenant, Unrestricted Cash Balance, Minimum	150,000,000
Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | Fixed Senior Secured First Lien 6.875% Notes and Fixed Senior Secured First Lien 10% Notes [Member]
Line of Credit Facility [Line Items]
Principal Amount Of Affiliate Debt Acquired In Exchange Transaction					1,673,000,000
Principal Amount Of Affiliate Debt Repurchased					2,312,000,000
Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | Fixed Senior Secured Second Lien 11% Notes and Fixed Senior Secured Second Lien 11.75% Notes [Member] [Member]
Line of Credit Facility [Line Items]
Repayment of Debt And Pre-Petition And Post-Petition Interest	750,000,000
Repayments of Debt	445,000,000
Pre-Petition Interest Paid and Accrued On Pre-Petition Debt	55,000,000
Interest paid/accrued on pre-petition debt	235,000,000
RSA First Lien Note Parties And Qualifying Holders of EFIH First Lien Notes Tendered By Participation Date [Member] | Energy Future Intermediate Holding CO LLC [Member] | First-Lien Debtor-in-Possession Facility [Member] | Debtor-in-Possession Financing, First Lien Debt Facility Agreement [Member]
Line of Credit Facility [Line Items]
Debtor-in-Possession Financing, Debt Settlement, Settlement Price, Percentage of Principal and Percentage of Accrued and Unpaid Interest, Percentage of Principal					105.00%
Debtor-in-Possession Financing, Debt Settlement, Settlement Price, Percentage of Principal and Percentage of Accrued and Unpaid Interest, Percentage of Accrued and Unpaid Interest					101.00%
RSA First Lien Note Parties And Qualifying Holders of EFIH First Lien Notes Tendered By Participation Date [Member] | Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | Fixed Senior Secured First Lien 6.875% Notes and Fixed Senior Secured First Lien 10% Notes [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Increase, Accrued Interest					78,000,000
Non-Settling Holders Of EFIH First Lien Notes [Member] | Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | Fixed Senior Secured First Lien 6.875% Notes and Fixed Senior Secured First Lien 10% Notes [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Increase, Accrued Interest					$128,000,000
[1]	For the three months ended March 31, 2015, amounts include $235 million in post-petition interest related to the EFIH Second Lien Notes (see Note 10). Includes amounts related to interest rate swaps totaling zero and $146 million for the three months ended March 31, 2015 and 2014, respectively.

DebtorInPossession_Borrowing_F4

Debtor-In-Possession Borrowing Facilities (Long-Term Debt Not Subject to Compromise) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$157		$167
Long-term debt due currently (Note 9)	-36		-39
Long-term debt, less amounts due currently (Note 9)	121		128
EFH Corp. [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	45		47
Energy Future Competitive Holdings Company [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	45		47
Debt Instrument, Unamortized premium (discount) fair value adjustments recorded under purchase accounting	-3	[1]	-3	[1]
Texas Competitive Electric Holdings Company LLC [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	67		73
Capital lease obligations	43		44
Other Long-term Debt	2		2
Debt Instrument, Unamortized Discount	-1		-2
8.82% Building Financing due semiannually through February 11, 2022 [Member] | EFH Corp. [Member] | Building Financing [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	38		40
Debt Instrument, Unamortized premium (discount) fair value adjustments recorded under purchase accounting	7	[1]	7	[1]
Debt Instrument, Interest Rate, Stated Percentage	8.82%
Fixed 9.58% Notes due in annual installments through December 4, 2019 [Member] | Energy Future Competitive Holdings Company [Member] | Fixed Notes [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	21	[2]	21	[2]
Debt Instrument, Interest Rate, Stated Percentage	9.58%
Fixed 8.254% Notes due in quarterly installments through December 31, 2021 [Member] | Energy Future Competitive Holdings Company [Member] | Fixed Notes [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	27	[2]	29	[2]
Debt Instrument, Interest Rate, Stated Percentage	8.25%
Fixed 7.48% Secured Facility Bonds With Amortizing Payments Through January 2017 [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Fixed Secured Facility Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	23	[3]	25	[3]
Debt Instrument, Interest Rate, Stated Percentage	7.48%
7.46% Fixed Secured Facility Bonds with amortizing payments through January 2015 [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Fixed Secured Facility Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$0	[3]	$4	[3]
Debt Instrument, Interest Rate, Stated Percentage	7.46%
[1]	Amount represents unamortized fair value adjustments recorded under purchase accounting.
[2]	Approved by the Bankruptcy Court for repayment.
[3]	Debt issued by trust and secured by assets held by the trust.

Liabilities_Subject_to_Comprom2

Liabilities Subject to Compromise (Liabilities Subject to Compromise) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Liabilities Subject to Compromise [Abstract]
Liabilities Subject To Compromise, Debt	$34,679	$35,124
Accrued interest on notes, loans and other debt	749	804
Net liability under terminated TCEH interest rate swap and natural gas hedging agreements	1,235	1,235
Trade accounts payable and other expected allowed claims	272	269
Total liabilities subject to compromise	$36,935	$37,432

Liabilities_Subject_to_Comprom3

Liabilities Subject to Compromise (Pre-Petition Notes, Loans and Other Debt Reported as Liabilities Subject to Compromise) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	$34,679		$35,124
Consolidation, Eliminations [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,664		1,664
Deferred Debt Issuance And Extension Costs [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	733		733
EFH Corp. [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	529		529
EFH Corp. [Member] | Senior Secured Debt [Member] | 9.75% Fixed Senior Secured First Lien Notes due October 15, 2019 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	2		2
Debt Instrument, Interest Rate, Stated Percentage	9.75%
EFH Corp. [Member] | Senior Secured Debt [Member] | 10% Fixed Senior Secured First Lien Notes due January 15, 2020 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	3		3
Debt Instrument, Interest Rate, Stated Percentage	10.00%
EFH Corp. [Member] | Fixed Senior Notes [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	60
EFH Corp. [Member] | Fixed Senior Notes [Member] | 10.875% Fixed Senior Notes due November 1, 2017 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	33		33
Debt Instrument, Interest Rate, Stated Percentage	10.88%
EFH Corp. [Member] | Fixed Senior Notes [Member] | 11.25 / 12.00% Senior Toggle Notes due November 1, 2017 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	27		27
EFH Corp. [Member] | Fixed Senior Notes [Member] | 11.25 / 12.00% Senior Toggle Notes due November 1, 2017 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	11.25%
EFH Corp. [Member] | Fixed Senior Notes [Member] | 11.25 / 12.00% Senior Toggle Notes due November 1, 2017 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	12.00%
EFH Corp. [Member] | Fixed Senior Notes [Member] | 5.55% Fixed Series P Senior Notes due November 15, 2014 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	90	[1]	90	[1]
Debt Instrument, Interest Rate, Stated Percentage	5.55%	[1]
EFH Corp. [Member] | Fixed Senior Notes [Member] | 5.55% Fixed Series P Senior Notes due November 15, 2014 [Member] | Consolidation, Eliminations [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	281		281
EFH Corp. [Member] | Fixed Senior Notes [Member] | 6.50% Fixed Series Q Senior Notes due November 15, 2024 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	201	[1]	201	[1]
Debt Instrument, Interest Rate, Stated Percentage	6.50%	[1]
EFH Corp. [Member] | Fixed Senior Notes [Member] | 6.50% Fixed Series Q Senior Notes due November 15, 2024 [Member] | Consolidation, Eliminations [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	545		545
EFH Corp. [Member] | Fixed Senior Notes [Member] | 6.55% Fixed Series R Senior Notes due November 15, 2034 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	291	[1]	291	[1]
Debt Instrument, Interest Rate, Stated Percentage	6.55%	[1]
EFH Corp. [Member] | Fixed Senior Notes [Member] | 6.55% Fixed Series R Senior Notes due November 15, 2034 [Member] | Consolidation, Eliminations [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	456		456
EFH Corp. [Member] | Building Financing [Member] | 8.82% Building Financing due semiannually through February 11, 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.82%
EFH Corp. [Member] | Unamortized Fair Value Discount [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	-118	[2]	-118	[2]
Energy Future Intermediate Holding CO LLC [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	3,401		3,846
Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | 9.75% Fixed Senior Secured First Lien Notes due October 15, 2019 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	2		2
Debt Instrument, Interest Rate, Stated Percentage	9.75%
Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | 11% Fixed Senior Secured Second Lien Notes due October 1, 2021 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	322		406
Debt Instrument, Interest Rate, Stated Percentage	11.00%
Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | 11.75% Fixed Senior Secured Second Lien Notes due March 1, 2022 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,389		1,750
Debt Instrument, Interest Rate, Stated Percentage	11.75%
Energy Future Intermediate Holding CO LLC [Member] | Fixed Senior Notes [Member] | 11.25%/ 12.25% Senior Toggle Notes due December 1, 2018 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,566		1,566
Energy Future Intermediate Holding CO LLC [Member] | Fixed Senior Notes [Member] | 11.25%/ 12.25% Senior Toggle Notes due December 1, 2018 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	11.25%
Energy Future Intermediate Holding CO LLC [Member] | Fixed Senior Notes [Member] | 11.25%/ 12.25% Senior Toggle Notes due December 1, 2018 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	12.25%
Energy Future Intermediate Holding CO LLC [Member] | Unamortized Premium [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	243		243
Energy Future Intermediate Holding CO LLC [Member] | Unamortized Discount [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	-121		-121
Energy Future Competitive Holdings Company [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	8		8
Energy Future Competitive Holdings Company [Member] | Unamortized Fair Value Discount [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	-1	[2]	-1	[2]
Energy Future Competitive Holdings Company [Member] | Fixed Notes [Member] | Fixed 9.58% Notes due in annual installments through December 4, 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.58%
Energy Future Competitive Holdings Company [Member] | Fixed Notes [Member] | Fixed 8.254% Notes due in quarterly installments through December 31, 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.25%
Energy Future Competitive Holdings Company [Member] | Junior Subordinated Debentures [Member] | Floating Rate Junior Subordinated Debentures, Series D due January 30, 2037 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1		1
Energy Future Competitive Holdings Company [Member] | Junior Subordinated Debentures [Member] | 8.175% Fixed Junior Subordinated Debentures, Series E due January 30, 2037 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	8		8
Debt Instrument, Interest Rate, Stated Percentage	8.18%
Texas Competitive Electric Holdings Company LLC [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	31,474		31,474
Texas Competitive Electric Holdings Company LLC [Member] | Senior Secured Debt [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,571
Texas Competitive Electric Holdings Company LLC [Member] | Senior Secured Debt [Member] | 11.5% Fixed Senior Secured Notes due October 1, 2020 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,750		1,750
Debt Instrument, Interest Rate, Stated Percentage	11.50%
Texas Competitive Electric Holdings Company LLC [Member] | Senior Secured Debt [Member] | 15% Fixed Senior Secured Second Lien Notes due April 1, 2021 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	336		336
Debt Instrument, Interest Rate, Stated Percentage	15.00%
Texas Competitive Electric Holdings Company LLC [Member] | Senior Secured Debt [Member] | 15% Fixed Senior Secured Second Lien Notes due April 1, 2021, Series B [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,235		1,235
Debt Instrument, Interest Rate, Stated Percentage	15.00%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed Senior Notes [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	4,874
Texas Competitive Electric Holdings Company LLC [Member] | Fixed Senior Notes [Member] | 10.25% Fixed Senior Notes due November 1, 2015 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,833	[1]	1,833	[1]
Debt Instrument, Interest Rate, Stated Percentage	10.25%	[1]
Texas Competitive Electric Holdings Company LLC [Member] | Fixed Senior Notes [Member] | 10.25% Fixed Senior Notes due November 1, 2015 [Member] | Consolidation, Eliminations [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	213		213
Texas Competitive Electric Holdings Company LLC [Member] | Fixed Senior Notes [Member] | 10.25% Fixed Senior Notes due November 1, 2015, Series B [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,292	[1]	1,292	[1]
Debt Instrument, Interest Rate, Stated Percentage	10.25%	[1]
Texas Competitive Electric Holdings Company LLC [Member] | Fixed Senior Notes [Member] | 10.25% Fixed Senior Notes due November 1, 2015, Series B [Member] | Consolidation, Eliminations [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	150		150
Texas Competitive Electric Holdings Company LLC [Member] | Fixed Senior Notes [Member] | 10.50 / 11.25% Senior Toggle Notes due November 1, 2016 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,749		1,749
Texas Competitive Electric Holdings Company LLC [Member] | Fixed Senior Notes [Member] | 10.50 / 11.25% Senior Toggle Notes due November 1, 2016 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	10.50%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed Senior Notes [Member] | 10.50 / 11.25% Senior Toggle Notes due November 1, 2016 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	11.25%
Texas Competitive Electric Holdings Company LLC [Member] | Unamortized Discount [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	-91		-91
Texas Competitive Electric Holdings Company LLC [Member] | Unamortized Fair Value Discount [Member] | Pollution control revenue bonds [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	-103	[2]	-103	[2]
Texas Competitive Electric Holdings Company LLC [Member] | Term loan Facilities [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	22,616
Texas Competitive Electric Holdings Company LLC [Member] | Term loan Facilities [Member] | Term Loan Facilities maturing October 10, 2014 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	3,809		3,809
Texas Competitive Electric Holdings Company LLC [Member] | Term loan Facilities [Member] | Term Loan Facilities maturing October 10, 2017 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	15,691	[1]	15,691	[1]
Texas Competitive Electric Holdings Company LLC [Member] | Term loan Facilities [Member] | Term Loan Facilities maturing October 10, 2017 [Member] | Consolidation, Eliminations [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	19		19
Texas Competitive Electric Holdings Company LLC [Member] | Letter of Credit [Member] | Letter of Credit Facility maturing October 2014 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	42		42
Texas Competitive Electric Holdings Company LLC [Member] | Letter of Credit [Member] | Letter of Credit Facility maturing October 10, 2017 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,020		1,020
Texas Competitive Electric Holdings Company LLC [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility maturing October 2016 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	2,054		2,054
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 5.40% Fixed Series 1994A due May 1, 2029 [Member] | Brazos River Authority [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	39		39
Debt Instrument, Interest Rate, Stated Percentage	5.40%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 7.70% Fixed Series 1999A due April 1, 2033 [Member] | Brazos River Authority [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	111		111
Debt Instrument, Interest Rate, Stated Percentage	7.70%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 7.70% Fixed Series 1999C due March 1, 2032 [Member] | Brazos River Authority [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	50		50
Debt Instrument, Interest Rate, Stated Percentage	7.70%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 8.25% Fixed Series 2001A due October 1, 2030 [Member] | Brazos River Authority [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	71		71
Debt Instrument, Interest Rate, Stated Percentage	8.25%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 8.25% Fixed Series 2001D-1 due May 1, 2033 [Member] | Brazos River Authority [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	171		171
Debt Instrument, Interest Rate, Stated Percentage	8.25%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 6.30% Fixed Series 2003B due July 1, 2032 [Member] | Brazos River Authority [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	39		39
Debt Instrument, Interest Rate, Stated Percentage	6.30%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 6.75% Fixed Series 2003C due October 1, 2038 [Member] | Brazos River Authority [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	52		52
Debt Instrument, Interest Rate, Stated Percentage	6.75%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 5.40% Fixed Series 2003D due October 1, 2029, remarketing date October 1, 2014 [Member] | Brazos River Authority [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	31		31
Debt Instrument, Interest Rate, Stated Percentage	5.40%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 5.00% Fixed Series 2006 due March 1, 2041 [Member] | Brazos River Authority [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	100		100
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 6.45% Fixed Series 2000A due June 1, 2021 [Member] | Sabine River Authority of Texas [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	51		51
Debt Instrument, Interest Rate, Stated Percentage	6.45%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 5.20% Fixed Series 2001C due May 1, 2028 [Member] | Sabine River Authority of Texas [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	70		70
Debt Instrument, Interest Rate, Stated Percentage	5.20%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 5.80% Fixed Series 2003A due July 1, 2022 [Member] | Sabine River Authority of Texas [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	12		12
Debt Instrument, Interest Rate, Stated Percentage	5.80%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 6.15% Fixed Series 2003B due August 1, 2022 [Member] | Sabine River Authority of Texas [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	45		45
Debt Instrument, Interest Rate, Stated Percentage	6.15%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed/Floating Series [Member] | 6.25% Fixed Series 200A due May 1, 2028 [Member] | Trinity River Authority of Texas [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	14		14
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed Secured Facility Bonds [Member] | Fixed 7.48% Secured Facility Bonds With Amortizing Payments Through January 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.48%
Texas Competitive Electric Holdings Company LLC [Member] | Fixed Secured Facility Bonds [Member] | 7.46% Fixed Secured Facility Bonds with amortizing payments through January 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.46%
Texas Competitive Electric Holdings Company LLC [Member] | Other Debt Obligations [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	$1		$1
[1]	Excludes the following principal amounts of debt held by EFIH or EFH Corp. (parent entity) and eliminated in consolidation. March 31, 2015 December 31, 2014EFH Corp. 5.55% Fixed Series P Senior Notes due November 15, 2014$281 $281EFH Corp. 6.50% Fixed Series Q Senior Notes due November 15, 2024545 545EFH Corp. 6.55% Fixed Series R Senior Notes due November 15, 2034456 456TCEH Floating Rate Term Loan Facilities due October 10, 201719 19TCEH 10.25% Fixed Senior Notes due November 1, 2015213 213TCEH 10.25% Fixed Senior Notes due November 1, 2015, Series B150 150Total$1,664 $1,664
[2]	Amount represents unamortized fair value adjustments recorded under purchase accounting.

Liabilities_Subject_to_Comprom4

Liabilities Subject to Compromise (Information Regarding Significant Outstanding Pre-Petition Debt) (Details) (USD $)	3 Months Ended				12 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014		Jul. 31, 2014
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	$34,679				$35,124
Restricted cash (Note 17)	873				901
Interest paid/accrued on pre-petition debt	237	[1]	831	[1]
Consolidation, Eliminations [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,664				1,664
Texas Competitive Electric Holdings Company LLC [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	31,474				31,474
Letters of Credit Drawn By Nonaffiliated Counterparties	45				245
Letters of Credit Drawn By Executive Officers To Satisfy Payments Related To Long-Term Incentive Awards	20
Texas Competitive Electric Holdings Company LLC [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	22,616
Texas Competitive Electric Holdings Company LLC [Member] | Line of Credit [Member] | Term Loan Facilities maturing October 10, 2014 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	3,809				3,809
Debt Instrument, Basis Spread on Variable Rate	3.50%
Texas Competitive Electric Holdings Company LLC [Member] | Line of Credit [Member] | Term Loan Facilities maturing October 10, 2017 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	15,691	[2]			15,691	[2]
Debt Instrument, Basis Spread on Variable Rate	4.50%
Texas Competitive Electric Holdings Company LLC [Member] | Line of Credit [Member] | Term Loan Facilities maturing October 10, 2017 [Member] | Consolidation, Eliminations [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	19				19
Texas Competitive Electric Holdings Company LLC [Member] | Letter of Credit [Member] | Letter of Credit Facility maturing October 10, 2014 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	42				42
Debt Instrument, Basis Spread on Variable Rate	3.50%
Texas Competitive Electric Holdings Company LLC [Member] | Letter of Credit [Member] | Letter of Credit Facility maturing October 10, 2017 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,020				1,020
Debt Instrument, Basis Spread on Variable Rate	4.50%
Restricted cash (Note 17)	506
Restricted Cash, Amount supported in letters of credit outstanding	7
Restricted Cash, Amount Supported in Letters of Credit No Longer Available	499
Letters Of Credit Issued To Affiliated Party			157
Letters Of Credit Drawn By Affiliated Party	150
Letters of Credit Issued To Affiliated Party Remaining At Expiration Date							7
Texas Competitive Electric Holdings Company LLC [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility maturing October 2016 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	2,054				2,054
Texas Competitive Electric Holdings Company LLC [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	4,874
Texas Competitive Electric Holdings Company LLC [Member] | Senior Notes [Member] | Consolidation, Eliminations [Member] | Financial guarantee [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	363
Texas Competitive Electric Holdings Company LLC [Member] | Senior Secured Debt [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,571
Texas Competitive Electric Holdings Company LLC [Member] | Senior Secured Debt [Member] | 11.5% Fixed Senior Secured Notes due October 1, 2020 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,750				1,750
Energy Future Intermediate Holding CO LLC [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	3,401				3,846
Energy Future Intermediate Holding CO LLC [Member] | Senior Notes [Member] | 11.25%/ 12.25% Senior Toggle Notes due December 1, 2018 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,566				1,566
Debt Instrument, Registration Default, if not filed and declared effective after original issue date, variable interest rate increase for first ninety days	0.25%
Debt Instrument, Registration Default, if not filed and declared effective after original issue date, total variable interest rate increase after first ninety day period	0.25%
Debt Instrument Registration Default If Not Fled And Declared Effective After Original Issue Date, Total Interest Rate Percentage For First Ninety Days	11.50%
Debt Instrument Registration Default If Not Registered Within One Year Of Original Issue Date, Total Interest Rate Percentage After First Ninety Days	11.75%
Energy Future Intermediate Holding CO LLC [Member] | Senior Notes [Member] | 11.25%/ 12.25% Senior Toggle Notes due December 1, 2018 [Member] | Until June 1, 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Options to Pay Interest, Percentage Allowed in Cash	50.00%
Debt Instrument, Options to Pay Interest, Percentage Allowed in PIK Interest	50.00%
Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | Fixed Senior Secured Second Lien 11% Notes and Fixed Senior Secured Second Lien 11.75% Notes [Member] [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	735
Debt Repurchase Fees And Expenses	15
Percent Of Lenders Consenting To Debt Repurchase Transaction	97.00%
Consent Fee Related To Debt Repurchase Transaction	13
Repayments of Debt	445
Interest paid/accrued on pre-petition debt	235
Pre-Petition Interest Paid and Accrued On Pre-Petition Debt	55
Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | 6.875% Senior Secured First Lien Notes due August 15, 2017 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	0
Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | 6.875% Senior Secured First Lien Notes due August 15, 2017 [Member] | Oncor Holdings [Member]
Debt Instrument [Line Items]
Pledged Ownership Membership Interest Percentage	100.00%
Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | 10% Fixed Senior Secured First Lien Notes due December 1, 2020 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	0
Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | 11% Fixed Senior Secured Second Lien Notes due October 1, 2021 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	322				406
Repayments of Debt	84
Energy Future Intermediate Holding CO LLC [Member] | Senior Secured Debt [Member] | 11.75% Fixed Senior Secured Second Lien Notes due March 1, 2022 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,389				1,750
Repayments of Debt	361
Debt Instrument, Registration Default, if not filed and declared effective after original issue date, variable interest rate increase for first ninety days	0.25%
Debt Instrument, Registration Default, if not filed and declared effective after original issue date, total variable interest rate increase after first ninety day period	0.25%
Debt Instrument Registration Default If Not Fled And Declared Effective After Original Issue Date, Total Interest Rate Percentage For First Ninety Days	12.00%
Debt Instrument Registration Default If Not Registered Within One Year Of Original Issue Date, Total Interest Rate Percentage After First Ninety Days	12.25%
EFH Corp. [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	529				529
EFH Corp. [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	60
Energy Future Competitive Holdings Company [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	$8				$8
[1]	For the three months ended March 31, 2015, amounts include $235 million in post-petition interest related to the EFIH Second Lien Notes (see Note 10). Includes amounts related to interest rate swaps totaling zero and $146 million for the three months ended March 31, 2015 and 2014, respectively.
[2]	Excludes the following principal amounts of debt held by EFIH or EFH Corp. (parent entity) and eliminated in consolidation. March 31, 2015 December 31, 2014EFH Corp. 5.55% Fixed Series P Senior Notes due November 15, 2014$281 $281EFH Corp. 6.50% Fixed Series Q Senior Notes due November 15, 2024545 545EFH Corp. 6.55% Fixed Series R Senior Notes due November 15, 2034456 456TCEH Floating Rate Term Loan Facilities due October 10, 201719 19TCEH 10.25% Fixed Senior Notes due November 1, 2015213 213TCEH 10.25% Fixed Senior Notes due November 1, 2015, Series B150 150Total$1,664 $1,664

Commitments_And_Contingencies_

Commitments And Contingencies (Narrative) (Details) (USD $)	3 Months Ended	1 Months Ended
	Mar. 31, 2015	Feb. 29, 2012
Pending Litigation [Member] | EFIH First-Lien Makewhole Claim [Member]
Commitments and Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$432,000,000
Pending Litigation [Member] | EFIH Second-Lien Makewhole Claim [Member]
Commitments and Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	539,000,000
Pending Litigation [Member] | EFIH PIK Notes Makewhole Claim [Member]
Commitments and Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	100,000,000
Pending Litigation [Member] | EPA Versus Luminant and Big Brown Power Company (Big Brown and Martin Lake Generation Facilities) [Member] | Minimum [Member]
Commitments and Contingencies [Line Items]
Loss Contingency Damages Sought Value Per Day	32,500
Pending Litigation [Member] | EPA Versus Luminant and Big Brown Power Company (Big Brown and Martin Lake Generation Facilities) [Member] | Maximum [Member]
Commitments and Contingencies [Line Items]
Loss Contingency Damages Sought Value Per Day	37,500
CSAPR [Member]
Commitments and Contingencies [Line Items]
Emissions budget generation assets lower sulfur dioxide requirements (as a percent)		6.00%
Emissions budget generation assets higher annual nitrogen oxides requirements (as a percent)		3.00%
Emissions budget generation assets higher seasonal nitrogen oxides requirements (as a percent)		2.00%
Financial Standby Letter of Credit [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Commitments and Contingencies [Line Items]
Letters of Credit	374,000,000
Financial Standby Letter of Credit [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Support risk management and trading margin requirements, including over-the-counter hedging transactions and collateral postings with ERCOT [Member]
Commitments and Contingencies [Line Items]
Letters of Credit	200,000,000
Financial Standby Letter of Credit [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Support Executory Contracts And Insurance Agreements [Member]
Commitments and Contingencies [Line Items]
Letters of Credit	80,000,000
Financial Standby Letter of Credit [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Support Retail Electric Provider's financial requirements with the PUCT [Member]
Commitments and Contingencies [Line Items]
Letters of Credit	62,000,000
Financial Standby Letter of Credit [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Miscellaneous credit support requirements [Member]
Commitments and Contingencies [Line Items]
Letters of Credit	$32,000,000

Equity_Narrative_Details

Equity (Narrative) (Details)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Equity
Common stock, shares authorized	2,000,000,000		2,000,000,000
Common stock, shares outstanding	1,669,861,379	1,669,861,379	1,669,861,383	1,669,861,383

Equity_Changes_to_Equity_Detai

Equity (Changes to Equity) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014		Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	($19,723)		($13,255)
Net loss	-1,527		-609
Effects of stock-based incentive compensation plans			2
Change in unrecognized losses related to pension and OPEB plans	-2		-1
Net effects of cash flow hedges	1		0
Net effects related to Oncor	1		0
Investments by noncontrolling interest			1
Other			-2
Ending balance	-21,250		-13,864
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance					2	[1]	2	[2]
Ending balance	2	[1]	2	[2]	2	[1]	2	[2]
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			7,962		7,968
Effects of stock-based incentive compensation plans			2
Ending balance	7,968		7,964		7,968
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	-27,563		-21,157
Net loss	-1,527		-609
Ending balance	-29,090		-21,766
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	-130		-63
Change in unrecognized losses related to pension and OPEB plans	-2		-1
Net effects of cash flow hedges	1
Net effects related to Oncor	1
Ending balance	-130		-64
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1		0
Investments by noncontrolling interest			1
Other			-2
Ending balance	$0		$0		$0
[1]	Authorized shares totaled 2,000,000,000 at March 31, 2015. Outstanding shares totaled 1,669,861,379 and 1,669,861,379 at March 31, 2015 and December 31, 2014, respectively.
[2]	Authorized shares totaled 2,000,000,000 at March 31, 2014. Outstanding shares totaled 1,669,861,383 and 1,669,861,383 at March 31, 2014 and December 31, 2013, respectively.

Equity_Accumulated_Other_Compr

Equity (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	($130)	($63)
Amounts reclassified from accumulated other comprehensive income (loss) and reported in:
Depreciation and amortization	-218	-330
Selling, general and administrative expenses	-179	-218
Interest expense and related charges	-609	-863
Income Tax Expense (Benefit)	401	360
Equity in earnings of unconsolidated subsidiaries (net of tax) (Note 3)	75	80
Total other comprehensive income (loss)	0	-1
Ending balance	-130	-64
Dedesignated Cash Flow Hedges – Interest Rate Swaps [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			-53	-56
Amounts reclassified from accumulated other comprehensive income (loss) and reported in:
Ending balance	-51	-56	-53	-56
Pension and Other Postretirement Employee Benefit Liabilities Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			-77	-7
Amounts reclassified from accumulated other comprehensive income (loss) and reported in:
Ending balance	-79	-8	-77	-7
Reclassification out of Accumulated Other Comprehensive Income [Member]
Amounts reclassified from accumulated other comprehensive income (loss) and reported in:
Operating costs	-1	-1
Depreciation and amortization	1	-1
Selling, general and administrative expenses	-1	-1
Interest expense and related charges		1
Income Tax Expense (Benefit)	0	1
Equity in earnings of unconsolidated subsidiaries (net of tax) (Note 3)	1
Total other comprehensive income (loss)	0	-1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Dedesignated Cash Flow Hedges – Interest Rate Swaps [Member]
Amounts reclassified from accumulated other comprehensive income (loss) and reported in:
Operating costs	0	0
Depreciation and amortization	1	-1
Selling, general and administrative expenses	0	0
Interest expense and related charges		1
Income Tax Expense (Benefit)	0	0
Equity in earnings of unconsolidated subsidiaries (net of tax) (Note 3)	1
Total other comprehensive income (loss)	2	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension and Other Postretirement Employee Benefit Liabilities Adjustments [Member]
Amounts reclassified from accumulated other comprehensive income (loss) and reported in:
Operating costs	-1	-1
Depreciation and amortization	0	0
Selling, general and administrative expenses	-1	-1
Interest expense and related charges		0
Income Tax Expense (Benefit)	0	1
Equity in earnings of unconsolidated subsidiaries (net of tax) (Note 3)	0
Total other comprehensive income (loss)	($2)	($1)

Fair_Value_Measurements_Schedu

Fair Value Measurements (Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Assets:
Nuclear decommissioning trust	$905		$893
Equity securities [Member]
Assets:
Nuclear decommissioning trust	597	[1]	592	[1]
Debt securities [Member]
Assets:
Nuclear decommissioning trust	308	[2]	301	[2]
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Total assets	739		777
Liabilities:
Total liabilities	173		278
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity securities [Member]
Assets:
Nuclear decommissioning trust	378	[3]	375	[3]
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commodity contracts [Member]
Assets:
Derivative Assets	361		402
Liabilities:
Derivative Liabilities	173		278
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets:
Total assets	581		564
Liabilities:
Total liabilities	22		25
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity securities [Member]
Assets:
Nuclear decommissioning trust	219	[3]	217	[3]
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Debt securities [Member]
Assets:
Nuclear decommissioning trust	308	[3]	301	[3]
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commodity contracts [Member]
Assets:
Derivative Assets	54		46
Liabilities:
Derivative Liabilities	22		25
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets:
Total assets	69		49
Liabilities:
Total liabilities	9		14
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commodity contracts [Member]
Assets:
Derivative Assets	69		49
Liabilities:
Derivative Liabilities	9		14
Total [Member]
Assets:
Total assets	1,389		1,390
Liabilities:
Total liabilities	204		317
Total [Member] | Equity securities [Member]
Assets:
Nuclear decommissioning trust	597	[3]	592	[3]
Total [Member] | Debt securities [Member]
Assets:
Nuclear decommissioning trust	308	[3]	301	[3]
Total [Member] | Commodity contracts [Member]
Assets:
Derivative Assets	484		497
Liabilities:
Derivative Liabilities	$204		$317
[1]	The investment objective for equity securities is to invest tax efficiently and to match the performance of the S&P 500 Index.
[2]	The investment objective for debt securities is to invest in a diversified tax efficient portfolio with an overall portfolio rating of AA or above as graded by S&P or Aa2 by Moody's Investors Services, Inc. The debt securities are heavily weighted with municipal bonds. The debt securities had an average coupon rate of 4.32% and 4.35% at March 31, 2015 and December 31, 2014, respectively, and an average maturity of 6 years at both March 31, 2015 and December 31, 2014.
[3]	The nuclear decommissioning trust investment is included in the other investments line in the condensed consolidated balance sheets.

Fair_Value_Measurements_Schedu1

Fair Value Measurements (Schedule of Fair Value of the Level 3 Assets and Liabilities by Major Contract Type (All Related to Commodity Contracts) and the Significant Unobservable Inputs Used in the Valuations) (Details) (Derivative financial instruments, assets and liabilities [Member], Level 3 [Member], USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets	$69,000,000	[1]	$49,000,000	[1]
Liabilities	-9,000,000	[1]	-14,000,000	[1]
Derivative Assets (Liabilities), at Fair Value, Net	60,000,000	[1]	35,000,000	[1]
Electricity purchases and sales [Member] | Valuation Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets	11,000,000	[1]	4,000,000	[1]
Liabilities	-2,000,000	[1]	-5,000,000	[1]
Derivative Assets (Liabilities), at Fair Value, Net	9,000,000	[1]	-1,000,000	[1]
Electricity spread options [Member] | Option Pricing Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets	4,000,000	[1]	2,000,000	[1]
Liabilities	-2,000,000	[1]	-1,000,000	[1]
Derivative Assets (Liabilities), at Fair Value, Net	2,000,000	[1]	1,000,000	[1]
Electricity congestion revenue rights [Member] | Market Approach [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets	42,000,000	[1],[2]	38,000,000	[1],[2]
Liabilities	-3,000,000	[1],[2]	-4,000,000	[1],[2]
Derivative Assets (Liabilities), at Fair Value, Net	39,000,000	[1],[2]	34,000,000	[1],[2]
Coal purchases [Member] | Market Approach [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets	0	[1],[2]	0	[1],[2]
Liabilities	-2,000,000	[1],[2]	-4,000,000	[1],[2]
Derivative Assets (Liabilities), at Fair Value, Net	-2,000,000	[1],[2]	-4,000,000	[1],[2]
Other [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets	12,000,000	[1],[3]	5,000,000	[1],[3]
Liabilities	0	[1],[3]	0	[1],[3]
Derivative Assets (Liabilities), at Fair Value, Net	12,000,000	[1],[3]	5,000,000	[1],[3]
Minimum [Member] | Electricity purchases and sales [Member] | Valuation Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Illiquid pricing locations (in usd per MWh)	25	[1],[4],[5]	30	[1],[4],[5]
Hourly price curve shape (in usd per MWh)	20	[1],[5],[6]	20	[1],[5],[6]
Minimum [Member] | Electricity spread options [Member] | Option Pricing Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Gas to power correlation (as a percent)	20.00%	[1],[5],[7]	15.00%	[1],[5],[7]
Power volatility (as a percent)	10.00%	[1],[5],[8]	10.00%	[1],[5],[8]
Minimum [Member] | Electricity congestion revenue rights [Member] | Market Approach [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Illiquid price differences between settlement points	0	[1],[2],[5],[9]	0	[1],[2],[5],[9]
Minimum [Member] | Coal purchases [Member] | Market Approach [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Illiquid price variances between mines			0	[1],[10],[2],[5]
Fair Value Inputs, Illiquid Pricing Variances Between Heat Content	0	[1],[11],[2],[5]	0.3	[1],[11],[2],[5]
Maximum [Member] | Electricity purchases and sales [Member] | Valuation Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Illiquid pricing locations (in usd per MWh)	45	[1],[4],[5]	50	[1],[4],[5]
Hourly price curve shape (in usd per MWh)	60	[1],[5],[6]	70	[1],[5],[6]
Maximum [Member] | Electricity spread options [Member] | Option Pricing Model [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Gas to power correlation (as a percent)	95.00%	[1],[5],[7]	95.00%	[1],[5],[7]
Power volatility (as a percent)	30.00%	[1],[5],[8]	30.00%	[1],[5],[8]
Maximum [Member] | Electricity congestion revenue rights [Member] | Market Approach [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Illiquid price differences between settlement points	20	[1],[2],[5],[9]	20	[1],[2],[5],[9]
Maximum [Member] | Coal purchases [Member] | Market Approach [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Illiquid price variances between mines			1	[1],[10],[2],[5]
Fair Value Inputs, Illiquid Pricing Variances Between Heat Content	$0.50	[1],[11],[2],[5]	$0.40	[1],[11],[2],[5]
[1]	Electricity purchase and sales contracts include hedging positions in the ERCOT regions, as well as power contracts, the valuations of which include unobservable inputs related to the hourly shaping of the price curve. Electricity spread option contracts consist of physical electricity call options. Electricity congestion revenue rights contracts consist of forward purchase contracts (swaps and options) used to hedge electricity price differences between settlement points within ERCOT. Coal purchase contracts relate to western (Powder River Basin) coal.
[2]	While we use the market approach, there is either insufficient market data to consider the valuation liquid or the significance of credit reserves or non-performance risk adjustments results in a Level 3 designation.
[3]	Other includes contracts for ancillary services, natural gas, diesel options, coal options and weather dependent power options.
[4]	Based on the historical range of forward average monthly ERCOT hub and load zone prices.
[5]	The range of the inputs may be influenced by factors such as time of day, delivery period, season and location.
[6]	Based on the historical range of forward average hourly ERCOT North Hub prices.
[7]	Estimate of the historical range based on forward natural gas and on-peak power prices for the ERCOT hubs most relevant to our spread options.
[8]	Based on historical forward price changes.
[9]	Based on the historical price differences between settlement points within the ERCOT hubs and load zones.
[10]	Based on the historical range of price variances between mine locations.
[11]	Based on historical ranges of forward average prices between different heat contents (potential energy in coal for a given mass).

Fair_Value_Measurements_Schedu2

Fair Value Measurements (Schedule of Changes in Fair Value of the Level 3 Assets and Liabilities (All Related to Commodity Contracts)) (Details) (Level 3 [Member], Commodity contracts [Member], Derivative financial instruments, assets and liabilities [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Level 3 [Member] | Commodity contracts [Member] | Derivative financial instruments, assets and liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net asset (liability) balance at beginning of period	$35		($973)
Total unrealized valuation gains (losses)	16		-85
Purchases, issuances and settlements:
Purchases	19	[1]	9	[1]
Issuances	-3	[1]	-1	[1]
Settlements	-8	[1]	151	[1]
Transfers into Level 3	0	[2]	0	[2]
Transfers out of Level 3	1	[2]	2	[2]
Net change	25	[3]	76	[3]
Net asset (liability) balance at end of period	60		-897
Unrealized valuation gains (losses) relating to instruments held at end of period	$15		($71)
[1]	Settlements reflect reversals of unrealized mark-to-market valuations previously recognized in net income. Purchases and issuances reflect option premiums paid or received.
[2]	Includes transfers due to changes in the observability of significant inputs. Transfers in and out occur at the end of each quarter, which is when the assessments are performed. All Level 3 transfers during the periods presented are in and out of Level 2.
[3]	Substantially all changes in values of commodity contracts are reported in the condensed statements of consolidated income (loss) in net gain (loss) from commodity hedging and trading activities. Activity excludes changes in fair value in the month the positions settled as well as amounts related to positions entered into and settled in the same month.

Commodity_And_Other_Derivative2

Commodity And Other Derivative Contractual Assets And Liabilities (Termination of Commodity Hedges and Interest Rate Swaps) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	2-May-14
Termination of Commodity Hedges and Interest Rate Swaps [Line Items]
Net Liability, Interest Rate and Commodity Contract Positions Terminated			$1,108
Net Liability, Accounts Payable Related To Matured Interest Rate Swaps Secured By First-Lien Secured Interest	127
Net liability under terminated TCEH interest rate swap and natural gas hedging agreements	1,235	1,235
Texas Competitive Electric Holdings Company LLC [Member] | Commodity Contract [Member]
Termination of Commodity Hedges and Interest Rate Swaps [Line Items]
Realized Gain (Loss) On Terminated Commodity Related Derivatives	117
Texas Competitive Electric Holdings Company LLC [Member] | Interest Rate Swap [Member]
Termination of Commodity Hedges and Interest Rate Swaps [Line Items]
Realized Gain (Loss) On Terminated Interest Rate Derivatives	$1,225

Commodity_And_Other_Derivative3

Commodity And Other Derivative Contractual Assets And Liabilities (Financial Statement Effects of Derivatives) (Details) (Commodity contracts [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]
Derivative asset, Fair Value, Gross Asset	$484	$497
Derivative liabilities, Fair Value, Gross Liability	-204	-317
Derivative asset, Fair Value, Net	484	497
Derivative liabilities, Fair Value, Net	-204	-317
Current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, Fair Value, Gross Asset	466	492
Derivative liabilities, Fair Value, Gross Asset	0	0
Noncurrent assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, Fair Value, Gross Asset	18	5
Derivative liabilities, Fair Value, Gross Asset	0	0
Current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, Fair Value, Gross Liability	0	0
Derivative liabilities, Fair Value, Gross Liability	-202	-316
Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, Fair Value, Gross Liability	0	0
Derivative liabilities, Fair Value, Gross Liability	($2)	($1)

Commodity_And_Other_Derivative4

Commodity And Other Derivative Contractual Assets And Liabilities (Derivative (Income Statement Presentation) and Derivative type (Income Statement Presentation of Loss Reclassified from Accumulated OCI into Income)) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss)	$125		($261)
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	35				36
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	-2
Net gain from commodity hedging and trading activities [Member] | Commodity contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss)	125	[1]	-179	[1]
Interest expense and related charges [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss)	$0	[2]	($82)	[2]
[1]	Amount represents changes in fair value of positions in the derivative portfolio during the period, as realized amounts related to positions settled are assumed to equal reversals of previously recorded unrealized amounts.
[2]	Includes unrealized mark-to-market net gain (loss) as well as the net realized effect on interest paid/accrued, both reported in Interest Expense and Related Charges

Commodity_And_Other_Derivative5

Commodity And Other Derivative Contractual Assets And Liabilities (Derivative Assets and Liabilities From Balance Sheet to Net Amounts After Consideration Netting Arrangements with Counterparties and Financial Collateral) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$280		$180
Derivative (Assets) Liability, Fair Value of Collateral, Net	-92	[1]	-14	[1]
Derivative Assets (Liability), Fair Value, Amount Offset Against Collateral	188		166
Commodity contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets: Amounts Presented in Balance Sheet	484		497
Derivative assets: Offsetting Financial Instruments	-195	[2]	-298	[2]
Derivative assets: Financial Collateral (Received) Pledged	-93	[1]	-16	[1]
Derivative assets: Net Amounts	196		183
Derivative liabilities: Amounts Presented in Balance Sheet	-204		-317
Derivative liabilities: Offsetting Financial Instruments	195	[2]	298	[2]
Derivative liabilities: Financial Collateral (Received) Pledged	1	[1]	2	[1]
Derivative liabilities: Net Amounts	($8)		($17)
[1]	Financial collateral consists entirely of cash margin deposits.
[2]	Amounts presented exclude trade accounts receivable and payable related to settled financial instruments.

Commodity_And_Other_Derivative6

Commodity And Other Derivative Contractual Assets And Liabilities (Derivative Volumes) (Details)	Mar. 31, 2015		Dec. 31, 2014
	MMBTU		MMBTU
Natural Gas Derivative [Member]
Derivatives, Fair Value [Line Items]
Nonmonetary Notional Volume	2,115,000,000	[1]	1,687,000,000	[1]
Electricity (in GWh) [Member]
Derivatives, Fair Value [Line Items]
Nonmonetary Notional Volume	30,814		22,820
Congestion Revenue RIghts (in GWh) [Member]
Derivatives, Fair Value [Line Items]
Nonmonetary Notional Volume	89,637	[2]	89,484	[2]
Coal (in tons) [Member]
Derivatives, Fair Value [Line Items]
Nonmonetary Notional Volume	8,000,000		10,000,000
Fuel oil (in gallons) [Member]
Derivatives, Fair Value [Line Items]
Nonmonetary Notional Volume	38,000,000		36,000,000
Uranium (in pounds) [Member]
Derivatives, Fair Value [Line Items]
Nonmonetary Notional Volume	252,000		150,000
[1]	Represents gross notional forward sales, purchases and options transactions, locational basis swaps and other natural gas transactions.
[2]	Represents gross forward purchases associated with instruments used to hedge electricity price differences between settlement points within ERCOT.

Commodity_And_Other_Derivative7

Commodity And Other Derivative Contractual Assets And Liabilities (Credit Risk-Related Contingent Features of Derivatives) (Details) (Cross-default credit derivative [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Cross-default credit derivative [Member]
Credit Derivatives [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	$0	$0

Commodity_And_Other_Derivative8

Commodity And Other Derivative Contractual Assets And Liabilities (Concentrations of Credit Risk Related to Derivatives) (Details) (Texas Competitive Electric Holdings Company LLC [Member], Credit Risk Contract [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Texas Competitive Electric Holdings Company LLC [Member] | Credit Risk Contract [Member]
Derivative [Line Items]
Total credit risk exposure to all counterparties related to derivative contracts	$535
Net exposure to those counterparties after taking into effect master netting arrangements, setoff provisions and collateral	229
Largest net exposure to single counterparty	$49
Credit risk exposure to Banking and financial sector percentage	72.00%
Net exposure to banking and financial sector percentage	46.00%

Related_Party_Transactions_Nar

Related Party Transactions (Narrrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	$34,679		$35,124
Oncor [Member]
Related Party Transaction [Line Items]
Selling, general and administrative expenses from transactions with related party	6	9
Related party tax expense, due from affiliates, current	0	0
Accounts receivable, related parties, noncurrent	47		47
Oncor Holdings [Member]
Related Party Transaction [Line Items]
Related party tax expense, due from affiliates, current	6	5
Sponsor Group [Member]
Related Party Transaction [Line Items]
Selling, general and administrative expenses from transactions with related party	10	10
Related Party Transaction, Selling, General and Administrative Cost Paid in Transactions With Related Party	0	0
Texas Competitive Electric Holdings Company LLC [Member]
Related Party Transaction [Line Items]
Selling, general and administrative expenses from transactions with related party	51	56
Related party transaction, amounts of transaction	15
EFH Corp. [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	529		529
EFH Corp. [Member] | Senior Notes [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	60
EFH Corp. [Member] | 9.75% Fixed Senior Secured First Lien Notes due October 15, 2019 [Member] | Senior Secured Debt [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	2		2
EFH Corp. [Member] | 10.875% Fixed Senior Notes due November 1, 2017 [Member] | Senior Notes [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	33		33
EFH Corp. [Member] | 10% Fixed Senior Secured First Lien Notes due January 15, 2020 [Member] | Senior Secured Debt [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	3		3
Energy Future Intermediate Holding CO LLC [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	3,401		3,846
Energy Future Intermediate Holding CO LLC [Member] | 10% Fixed Senior Secured First Lien Notes due December 1, 2020 [Member] | Senior Secured Debt [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	0
Energy Future Intermediate Holding CO LLC [Member] | 9.75% Fixed Senior Secured First Lien Notes due October 15, 2019 [Member] | Senior Secured Debt [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	2		2
Texas Competitive Electric Holdings Company LLC [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	31,474		31,474
Texas Competitive Electric Holdings Company LLC [Member] | Oncor [Member]
Related Party Transaction [Line Items]
Related party transaction, amounts of transaction	236	241
Due to Affiliate	128		118
Delivery fee surcharge remitted to related party	4	4
Event of credit rating downgrade, letter of credit required to be posted to secure payment obligations	170
Event of credit rating downgrade, minimum number of rating agencies downgrade below investment grade (in credit agencies downgrades)	2
Texas Competitive Electric Holdings Company LLC [Member] | Senior Secured Debt [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	1,571
Texas Competitive Electric Holdings Company LLC [Member] | Senior Notes [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	4,874
Texas Competitive Electric Holdings Company LLC [Member] | Line of Credit [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	22,616
Texas Competitive Electric Holdings Company LLC [Member] | Term Loan Facilities maturing October 10, 2014 [Member] | Line of Credit [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	3,809		3,809
Debt held by related party [Member] | Senior Notes [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	303			303
Debt held by related party [Member] | Energy Future Intermediate Holding CO LLC [Member] | Senior Notes [Member] | EFH Corp. [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	1,282			1,282
Debt held by related party [Member] | Energy Future Intermediate Holding CO LLC [Member] | Senior Notes [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	79			79
Decommisioning liablity [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Oncor [Member]
Related Party Transaction [Line Items]
Due to affiliate, noncurrent	485		479
Payable Attributable To Income Taxes [Member] | Oncor [Member]
Related Party Transaction [Line Items]
Due to affiliate, noncurrent	69		64
Due to Affiliate, Current	48		120
Payable Attributable To Income Taxes [Member] | Oncor Holdings [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	49		120
Due from Affiliate, Noncurrent	4
Collateral posted [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Oncor [Member]
Related Party Transaction [Line Items]
Cash and letters of credit posted as collateral	9		9
State and Local Jurisdiction [Member] | Receivable Attributable to Income Taxes [Member] | Oncor [Member]
Related Party Transaction [Line Items]
Due from affiliate, current	31		24
Internal Revenue Service (IRS) [Member] | Payable Attributable To Income Taxes [Member] | Oncor [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	79		144
Pension Plan, Defined Benefit [Member]
Related Party Transaction [Line Items]
Defined Benefit Plan Contributions By Employer Excluding Affiliated Supplemental Plan		84
Pension Plan, Defined Benefit [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Related Party Transaction [Line Items]
Defined Benefit Plan, Contributions by Employer		20
Oncor [Member] | Pension Plan, Defined Benefit [Member] | Majority-Owned Subsidiary, Unconsolidated [Member]
Related Party Transaction [Line Items]
Defined Benefit Plan, Contributions by Employer		64
Consolidation, Eliminations [Member]
Related Party Transaction [Line Items]
Liabilities Subject To Compromise, Debt	$1,664		$1,664

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	Reportable_segment
Segment Reporting Information [Line Items]
Number of reportable segments (in reportable segments)	2
Operating revenues (all Competitive Electric)	$1,272	$1,517
Equity in earnings of unconsolidated subsidiaries (net of tax) — Regulated Delivery (net of noncontrolling interests of $20 and $21)	75	80
Net income (loss):	-1,527	-609
Competitive Electric [Member]
Segment Reporting Information [Line Items]
Operating revenues (all Competitive Electric)	1,272	1,517
Net income (loss):	-1,336	-567
Regulated Delivery [Member]
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated subsidiaries (net of tax) — Regulated Delivery (net of noncontrolling interests of $20 and $21)	75	80
Net income (loss):	75	80
Corp. and Other [Member]
Segment Reporting Information [Line Items]
Net income (loss):	-266	-122
Noncontrolling Interest [Member]
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated subsidiaries (net of tax) — Regulated Delivery (net of noncontrolling interests of $20 and $21)	$20	$21

Supplementary_Financial_Inform2

Supplementary Financial Information (Other Income and Deductions) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Other income:
Office space rental income	$3	[1]	$3	[1]
Mineral rights royalty income	1	[2]	1	[2]
All other	4		5
Total other income	8		9
Other deductions:
All other	1		0
Total other deductions	60		0
Favorable purchase and sales contracts [Member]
Other deductions:
Impairment of Intangible Assets (Excluding Goodwill)	8	[2]	0
Environmental allowances and credits [Member]
Other deductions:
Impairment of Intangible Assets (Excluding Goodwill)	$51	[2]	$0
[1]	Reported in Corporate and Other.
[2]	Reported in Competitive Electric segment.

Supplementary_Financial_Inform3

Supplementary Financial Information (Restricted Cash) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Restricted Cash and Investments, Current	$6	$6
Restricted Cash and Investments, Noncurrent	873	901
Other Restricted Cash [Member]
Restricted Cash and Investments, Current	6	6
Restricted Cash and Investments, Noncurrent	0	0
Texas Competitive Electric Holdings Company LLC [Member] | Amount Related To Texas Competitive Electric Company LLC Debtor-In-Possession Facility [Member]
Restricted Cash and Investments, Current	0	0
Restricted Cash and Investments, Noncurrent	367	350
Texas Competitive Electric Holdings Company LLC [Member] | Amounts Related to TCEH's Letter of Credit Facility [Member]
Restricted Cash and Investments, Current	0	0
Restricted Cash and Investments, Noncurrent	$506	$551

Supplementary_Financial_Inform4

Supplementary Financial Information (Trade Accounts Receivable and Allowance for Doubtful Accounts) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Supplementary Financial Information [Abstract]
Wholesale and retail trade accounts receivable	$554		$604
Allowance for uncollectible accounts	-15	-17
Trade accounts receivable — net	539		589
Unbilled Receivables, Current	198		239
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for uncollectible accounts receivable at beginning of period	15	14
Increase for bad debt expense	9	10
Decrease for account write-offs	-9	-7
Allowance for uncollectible accounts receivable at end of period	$15	$17

Supplementary_Financial_Inform5

Supplementary Financial Information (Inventories by Major Category and Other Investments) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Inventories by Major Category
Materials and supplies	$215	$214
Fuel stock	230	215
Natural gas in storage	25	39
Total inventories	470	468
Other Investments
Nuclear plant decommissioning trust	905	893
Assets related to employee benefit plans, including employee savings programs, net of distributions	62	61
Land	36	37
Miscellaneous other	4	4
Total other investments	$1,007	$995

Supplementary_Financial_Inform6

Supplementary Financial Information (Nuclear Decommissioning Trust) (Details) (USD $)	3 Months Ended			12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Schedule of Schedule of Decommissioning Fund Investments [Line Items]
Cost	$576	[1]		$564	[1]
Unrealized gain	334			333
Unrealized loss	-5			-4
Fair market value	905			893
Realized gains	0		1
Realized losses	-1		0
Proceeds from sales of securities	23		33
Investments in securities	-27		-37
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	244	[2]		243	[2]
Debt securities [Member]
Schedule of Schedule of Decommissioning Fund Investments [Line Items]
Cost	295	[1],[3]		288	[1],[3]
Unrealized gain	13	[3]		13	[3]
Unrealized loss	0	[3]		0	[3]
Fair market value	308	[3]		301	[3]
Debt, Weighted Average Interest Rate	4.32%			4.35%
Decommissioning Fund Investments, Debt securities, average maturity	6 years			6 years
Decommissioning Fund Investments, debt maturities, one through five years, fair value	80
Decommissioning Fund Investments, debt maturities, five through ten years, fair value	72
Decommissioning Fund Investments, debt maturities, after ten years, fair value	156
Equity securities [Member]
Schedule of Schedule of Decommissioning Fund Investments [Line Items]
Cost	281	[1],[4]		276	[1],[4]
Unrealized gain	321	[4]		320	[4]
Unrealized loss	-5	[4]		-4	[4]
Fair market value	597	[4]		592	[4]
Oncor [Member]
Schedule of Schedule of Decommissioning Fund Investments [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	$47			$47
[1]	Includes realized gains and losses on securities sold.
[2]	Includes $47 million at both March 31, 2015 and December 31, 2014, representing pension liabilities related to Oncor
[3]	The investment objective for debt securities is to invest in a diversified tax efficient portfolio with an overall portfolio rating of AA or above as graded by S&P or Aa2 by Moody's Investors Services, Inc. The debt securities are heavily weighted with municipal bonds. The debt securities had an average coupon rate of 4.32% and 4.35% at March 31, 2015 and December 31, 2014, respectively, and an average maturity of 6 years at both March 31, 2015 and December 31, 2014.
[4]	The investment objective for equity securities is to invest tax efficiently and to match the performance of the S&P 500 Index.

Supplementary_Financial_Inform7

Supplementary Financial Information (Property, Plant and Equipment) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment — net (Note 17)	11,590,000,000	$12,397,000,000
Less accumulated amortization/depreciation	4,700,000,000	$5,300,000,000
Minimum [Member] | Lignite- And Nuclear-Fueled Generation Operations [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	17 years
Maximum [Member] | Lignite- And Nuclear-Fueled Generation Operations [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	54 years

Supplementary_Financial_Inform8

Supplementary Financial Information (Asset Retirement and Mining Reclamation Obligations) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance, Liability	$614
Additions:
Accretion	12
Reductions:
Payments	-14
Ending balance, Liability	612
Less amounts due currently	-58
Noncurrent liability at end of period	554		560
Nuclear Plant Decommissioning [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance, Liability	413
Additions:
Accretion	6
Reductions:
Payments	0
Ending balance, Liability	419
Less amounts due currently	0
Noncurrent liability at end of period	419
Mining Land Reclamation [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance, Liability	165
Additions:
Accretion	5
Reductions:
Payments	-14
Ending balance, Liability	156
Less amounts due currently	-58
Noncurrent liability at end of period	98
Other Asset Retirement Obligations [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance, Liability	36
Additions:
Accretion	1
Reductions:
Payments	0
Ending balance, Liability	37
Less amounts due currently	0
Noncurrent liability at end of period	37
Environmental Protection Agency [Member]
Asset Retirement Obligations [Line Items]
Estimated Capital Expenditures 2015-2020 Due To Disposal Of Coal Combustion Residuals From Electric Utilities Rule		$100

Supplementary_Financial_Inform9

Supplementary Financial Information (Other Noncurrent Liabilities and Deferred Credits) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Other Noncurrent Liabilities Noncurrent and Deferred Credits [Line Items]
Uncertain tax positions, including accrued interest	$75			$74
Retirement plan and other employee benefits	244	[1]		243	[1]
Asset retirement and mining reclamation obligations	554			560
Unfavorable purchase and sales contracts	560			566
Nuclear decomissioning cost over-recovery	485			479
Other	181			155
Total other noncurrent liabilities and deferred credits	2,099			2,077
Income tax benefit	-401		-360
Amortization of Deferred Charges
Amortization of Unfavorable Purchase and Sales Contracts	6		6
Estimated Future Amortization Expense
2015	24
2016	24
2017	24
2018	24
2019	24
Oncor [Member]
Other Noncurrent Liabilities Noncurrent and Deferred Credits [Line Items]
Retirement plan and other employee benefits	$47			$47
[1]	Includes $47 million at both March 31, 2015 and December 31, 2014, representing pension liabilities related to Oncor

Recovered_Sheet1

Supplementary Financial Information (Fair Value of Debt) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Debtor-In-Possession Facility [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure	$6,825	$6,825
Pre-Petition Notes, Loans And Other Debt (Reported As Liabilities Subject To Compromise) [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure	35,411	35,857
Long-Term Debt, Including Amounts Due Currently [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure	114	123
Fair Value, Inputs, Level 2 [Member] | Debtor-In-Possession Facility [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure	6,852	6,830
Fair Value, Inputs, Level 2 [Member] | Pre-Petition Notes, Loans And Other Debt (Reported As Liabilities Subject To Compromise) [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure	19,633	21,411
Fair Value, Inputs, Level 2 [Member] | Long-Term Debt, Including Amounts Due Currently [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure	$115	$119

Recovered_Sheet2

Supplementary Financial Information (Supplemental Cash Flow Information) (Details) (USD $)	3 Months Ended				1 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Jun. 30, 2014
Cash payments related to:
Interest paid	$671	[1]	$622	[1]
Capitalized interest	-3		-7
Interest paid (net of capitalized interest)	668	[1]	615	[1]
Income taxes	0		0
Reorganization items	89	[2]	0
Noncash investing and financing activities:
Construction expenditures	65	[3]	30	[3]
Senior Secured Debt [Member] | Fixed Senior Secured First Lien 6.875% Notes and Fixed Senior Secured First Lien 10% Notes [Member] | Energy Future Intermediate Holding CO LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Principal Amount Of Affiliate Debt Acquired In Exchange Transaction					1,673
First-Lien Debtor-in-Possession Facility [Member] | Senior Secured Super-Priority First Lien Term Loan [Member] | Energy Future Intermediate Holding CO LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Debtor-In-Possession Financing, Borrowings Used In Exchange Transaction For Pre-Petition Debt					1,836
RSA First Lien Note Parties And Qualifying Holders of EFIH First Lien Notes Tendered By Participation Date [Member] | Senior Secured Debt [Member] | Fixed Senior Secured First Lien 6.875% Notes and Fixed Senior Secured First Lien 10% Notes [Member] | Energy Future Intermediate Holding CO LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Debt Instrument, Increase, Accrued Interest					$78
[1]	Net of amounts received under interest rate swap agreements. For the three months ended March 31, 2015, this amount also includes amounts paid for adequate protection.
[2]	Represents cash payments for legal and other consulting services.
[3]	Represents end-of-period accruals.