Liabilities Subject to Compromise - Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 3,843		$ 7,877
Liabilities Subject To Compromise, Debt	3,843
Percentage of securities guaranteed by and push down debt	50.00%
Secured Debt [Member]
Debt Instrument [Line Items]
Unamortized premium			284
Unamortized discount			(146)
Total debt			7,847
Liabilities Subject To Compromise, Debt	3,846
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
Liabilities Subject To Compromise, Debt	0	[1]
Secured Debt [Member] | 10% Fixed Senior Secured First Lien Notes due December 1, 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, gross			3,482
Liabilities Subject To Compromise, Debt	0	[1]
Secured Debt [Member] | 11% Senior Secured Second Lien Notes due October 1, 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, gross			406
Stated interest rate (as a percent)	11.00%
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
Stated interest rate (as a percent)	11.75%
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] | 9.75% Fixed Senior Secured First Lien Notes due October 15, 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, gross			2
Liabilities Subject To Compromise, Debt	2
Stated interest rate (as a percent)	9.75%
Unamortized Discount [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	(121)
Unamortized Premium [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	243
Push Down Debt [Member]
Debt Instrument [Line Items]
Total debt			30	[2]
Liabilities Subject To Compromise, Debt	30	[2]
Push Down Debt [Member] | 10% Fixed Senior Secured First Lien Notes due December 1, 2020 [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	10.00%
Push Down Debt [Member] | Fixed Senior Secured First Lien 10% Notes due January 15, 2020 [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	10.00%
Push Down Debt [Member] | 9.75% Fixed Senior Secured First Lien Notes due October 15, 2019 [Member]
Debt Instrument [Line Items]
Stated interest rate (as a percent)	9.75%
Push Down Debt [Member] | 10.875% EFH Corp. Fixed Senior Notes due November 1, 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross			17	[2]
Liabilities Subject To Compromise, Debt	17	[2]
Stated interest rate (as a percent)	10.875%
Push Down Debt [Member] | 11.25/12.00% EFH Corp. Senior Toggle Notes due November 1, 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross			13	[2]
Liabilities Subject To Compromise, Debt	13	[2]
Deferred Debt Issuance And Extension Costs [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	(33)	[3]	0
Minimum [Member] | Push Down Debt [Member] | 11.25/12.00% EFH Corp. Senior Toggle Notes due November 1, 2017 [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	11.25%
Maximum [Member] | Push Down Debt [Member] | 11.25/12.00% EFH Corp. Senior Toggle Notes due November 1, 2017 [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	12.00%
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]
Stated interest rate (as a percent)	6.875%
Energy Future Intermediate Holding CO LLC [Member] | Secured Debt [Member] | 11% Senior Secured Second Lien Notes due October 1, 2021 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	406
Energy Future Intermediate Holding CO LLC [Member] | Secured Debt [Member] | 11.75% Senior Secured Second Lien Notes due March 1, 2022 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	1,750
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]
Liabilities Subject To Compromise, Debt	$ 1,566
Energy Future Intermediate Holding CO LLC [Member] | Minimum [Member] | Senior Notes [Member] | 11.25%/12.25% Senior Toggle Notes due December 1, 2018 [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	11.25%
Energy Future Intermediate Holding CO LLC [Member] | Maximum [Member] | Senior Notes [Member] | 11.25%/12.25% Senior Toggle Notes due December 1, 2018 [Member]
Debt Instrument [Line Items]
Effective interest rate (as a percent)	12.25%

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

[2] Represents 50% of the amount of these EFH Corp. securities guaranteed by EFIH and pushed down per the discussion below under "Guarantees and Push Down of EFH Corp. Pre-Petition Debt."

[3] or the nine months ended September 30, 2014, represents $1.836 billion principal amount of loans issued under the EFIH DIP Facility in excess of $1.673 billion principal amount of EFIH First Lien Notes exchanged and $78 million of related accrued interest (see Note 5). For the nine months ended September 30, 2013 represents $1.302 billion principal amount of EFIH debt issued in exchange for $1.310 billion principal amount of EFH Corp. and EFIH debt and $89 million principal amount of EFIH debt issued in exchange for $95 million principal amount of EFH Corp. debt.