Liabilities Subject to Compromise - EFIH 6.875% Senior Secured Notes (Details) (USD $) In Millions, unless otherwise specified						9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Secured Debt [Member]	Sep. 30, 2014 Secured Debt [Member] 6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]		Dec. 31, 2013 Secured Debt [Member] 6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]	Sep. 30, 2014 Energy Future Intermediate Holding CO LLC [Member] Secured Debt [Member] 6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	$ 3,843	$ 3,846	$ 0	[1]
Long-term debt, gross					$ 503
Pledged Ownership Membership Interest Percentage			100.00%
Stated interest rate (as a percent)						6.875%
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, incremental variable interest rate increase after first ninety day period						0.50%
Debt Instrument Registration Default If Not Fled And Declared Effective After Original Issue Date, Total Interest Rate Percentage For First Ninety Days						7.125%
Debt Instrument Registration Default If Not Registered Within One Year Of Original Issue Date, Total Interest Rate Percentage After First Ninety Days						7.375%

[1] The EFIH First Lien Notes were exchanged or settled in June 2014 (see Note 5).