Name:	efh_EquityMethodInvestmentAvailableDistributionUnderRegulatoryRestrictions
Namespace Prefix:	efh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of trade accounts and other receivables from affiliates reported by an equity method investment of the entity.

No definition available.

Name:	efh_EquityMethodInvestmentSummarizedFinancialInformationTradeAccountsAndOtherReceivablesFromAffiliates
Namespace Prefix:	efh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Ratio of regulatory capitalization, debt percentage, of an unconsolidated subsidary as of the period end date.

No definition available.

Name:	efh_PublicUtilitiesRatioOfRegulatoryCapitalizationDebtPercentage
Namespace Prefix:	efh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Ratio of regulatory capitalization, equity percentage, of an unconsolidated subsidary as of the period end date.

No definition available.

Name:	efh_PublicUtilitiesRatioOfRegulatoryCapitalizationEquityPercentage
Namespace Prefix:	efh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Ratio of debt to equity, debt percentage, established periodically by the Public Utility Commission of Texas for an unconsolidated subsidiary's ratemaking purposes.

No definition available.

Name:	efh_PuctRequirementsRatioOfDebtToEquityDebtPercentage
Namespace Prefix:	efh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Ratio of debt to equity, equity percentage, established periodically by the Public Utility Commission of Texas for an unconsolidated subsidiary's ratemaking purposes.

No definition available.

Name:	efh_PuctRequirementsRatioOfDebtToEquityEquityPercentage
Namespace Prefix:	efh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Article 5

Name:	us-gaap_EquityMethodInvestmentDividendsOrDistributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570