Equity (Narrative) (Details) (Texas Competitive Electric Holdings Company LLC [Member])	Sep. 30, 2013
Texas Competitive Electric Holdings Company LLC [Member]
Equity
Consolidated total debt to Adjusted EBITDA ratio related to dividend restrictions, threshold ratio (as a ratio)	6.5
Consolidated total debt to Adjusted EBITDA ratio related to dividend restrictions, actual ratio (as a ratio)	10.6

Consolidated total debt to Adjusted EBITDA ratio threshold related to a debt covenant restriciting the entity's ability to pay dividends or make other distributions in respect of the entity's common shares.

No definition available.

Name:	efh_ConsolidatedTotalDebtToAdjustedEbitdaRatioRelatedToDividendRestrictionsThresholdRatio
Namespace Prefix:	efh_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant