Liabilities Subject to Compromise - EFIH 10% Senior Secured Debt (Details) (USD $) In Millions, unless otherwise specified		1 Months Ended		1 Months Ended	9 Months Ended			9 Months Ended
	Sep. 30, 2014	Jan. 31, 2013 Secured Debt [Member]	Sep. 30, 2014 Secured Debt [Member]	Jan. 31, 2013 Secured Debt [Member] 10% Fixed Senior Secured First Lien Notes due December 1, 2020 [Member]	Sep. 30, 2014 Secured Debt [Member] 10% Fixed Senior Secured First Lien Notes due December 1, 2020 [Member]		Dec. 31, 2013 Secured Debt [Member] 10% Fixed Senior Secured First Lien Notes due December 1, 2020 [Member]	Sep. 30, 2013 Energy Future Intermediate Holding CO LLC [Member] Secured Debt [Member] Senior 10 Percent Secured Notes Due 2020 [Member]	Sep. 30, 2014 Energy Future Intermediate Holding CO LLC [Member] Secured Debt [Member] 10% Fixed Senior Secured First Lien Notes due December 1, 2020 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	$ 3,843		$ 3,846		$ 0	[1]
Long Term Debt And Capital Leases Issued, Principal Amount		89		1,302				1,302
Long-term debt, gross							$ 3,482
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, total 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					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%

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