Liabilities Subject to Compromise - Information Regarding Other Significant Outstanding Debt (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Secured Debt [Member] | 11.25%/12.25% Senior Toggle Notes due December 1, 2018 [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,566
Secured Debt [Member] | 6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 503
Pledged Ownership Membership Interest Percentage	100.00%
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]
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%
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]
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%