Liabilities Subject to Compromise - EFIH 11.75% Senior Secured Second Lien Notes (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Dec. 31, 2013
Debt Disclosure [Abstract]
Liabilities Subject To Compromise, Debt	$ 3,843
Secured Debt [Member]
Debt Disclosure [Abstract]
Liabilities Subject To Compromise, Debt	3,846
Secured Debt [Member] | 10% Fixed Senior Secured First Lien Notes due December 1, 2020 [Member]
Debt Disclosure [Abstract]
Liabilities Subject To Compromise, Debt	0	[1]
Debt Instrument [Line Items]
Debt Instrument, Registration Default, if not filed and declared effective after original issue date, variable interest rate increase for first ninety days	0.25%
Long-term debt, gross			3,482
Debt Instrument Registration Default If Not Fled And Declared Effective After Original Issue Date, Total Interest Rate Percentage For First Ninety Days	10.25%
Debt Instrument Registration Default If Not Registered Within One Year Of Original Issue Date, Total Interest Rate Percentage After First Ninety Days	10.50%
Secured Debt [Member] | 11.75% Senior Secured Second Lien Notes due March 1, 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, gross			1,750
Secured Debt [Member] | Senior Toggle 11 Point 25 Percent/ 12 Point 25 Percent Notes due December 1, 2018 [Member]
Debt Instrument [Line Items]
Long-term debt, gross			1,566
Energy Future Intermediate Holding CO LLC [Member] | Secured Debt [Member] | 11.75% Senior Secured Second Lien Notes due March 1, 2022 [Member]
Debt Disclosure [Abstract]
Liabilities Subject To Compromise, Debt	1,750
Debt Instrument [Line Items]
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	0.25%
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	12.50%
Energy Future Intermediate Holding CO LLC [Member] | Senior Notes [Member] | Senior Toggle 11 Point 25 Percent/ 12 Point 25 Percent Notes due December 1, 2018 [Member]
Debt Disclosure [Abstract]
Liabilities Subject To Compromise, Debt	$ 1,566
Debt Instrument [Line Items]
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 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%

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