Debtor-in-Possession Borrowings Facilities (Details) (USD $)	3 Months Ended	5 Months Ended	9 Months Ended			1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jan. 31, 2013 Secured Debt [Member]	Sep. 30, 2014 Energy Future Intermediate Holding CO LLC [Member] Debtor-In-Possession Facility [Member]	Jun. 30, 2014 Energy Future Intermediate Holding CO LLC [Member] Senior Secured Super-Priority First Lien Term Loan [Member] First-Lien Debtor-in-Possession Facility [Member]	Sep. 30, 2014 Energy Future Intermediate Holding CO LLC [Member] Senior Secured Super-Priority First Lien Term Loan [Member] First-Lien Debtor-in-Possession Facility [Member]	Jun. 30, 2014 Energy Future Intermediate Holding CO LLC [Member] Fixed Senior Secured First Lien 6.875% Notes and Fixed Senior Secured First Lien 10% Notes [Member] Secured Debt [Member]	Jun. 30, 2014 RSA First Lien Note Parties And Qualifying Holders of EFIH First Lien Notes Tendered By Participation Date [Member] Energy Future Intermediate Holding CO LLC [Member] Fixed Senior Secured First Lien 6.875% Notes and Fixed Senior Secured First Lien 10% Notes [Member] Secured Debt [Member]	Jun. 30, 2014 RSA First Lien Note Parties And Qualifying Holders of EFIH First Lien Notes Tendered By Participation Date [Member] Energy Future Intermediate Holding CO LLC [Member] Debtor-in-Possession Financing, First Lien Debt Facility Agreement [Member] First-Lien Debtor-in-Possession Facility [Member]	Jun. 30, 2014 Non-Settling Holders Of EFIH First Lien Notes [Member] Energy Future Intermediate Holding CO LLC [Member] Fixed Senior Secured First Lien 6.875% Notes and Fixed Senior Secured First Lien 10% Notes [Member] Secured Debt [Member]
Line of Credit Facility [Line Items]
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding									4.25%
Principal Amount Of Affiliate Debt Repurchased										$ 2,312,000,000
Debtor-in-Possession Financing, Amount Arranged									5,400,000,000
Debtor-In-Possession Financing, Borrowings Used In Exchange Transaction For Pre-Petition Debt								1,836,000,000
Principal Amount Of Affiliate Debt Acquired In Exchange Transaction						1,310,000,000				1,673,000,000
Debt Instrument, Increase, Accrued Interest											78,000,000		128,000,000
Debtor-in-Possession Financing, Debt Settlement, Settlement Price, Percentage of Principal and Percentage of Accrued and Unpaid Interest, Percentage of Principal												105.00%
Debtor-in-Possession Financing, Debt Settlement, Settlement Price, Percentage of Principal and Percentage of Accrued and Unpaid Interest, Percentage of Accrued and Unpaid Interest												101.00%
Debtor-In-Possession Financing, Borrowings Used to Repay Pre-Petition Debt								2,438,000,000
Debtor-In-Possession Financing, Borrowings Issued And Held As Cash								1,038,000,000
Loss on exchange and settlement of EFIH First Lien Notes (Notes 5 and 6)	0	108,000,000	108,000,000	0					108,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum									1.00%
Debt Instrument, Basis Spread on Variable Rate									3.25%
Borrowings under debtor-in-possession credit facilities (Note 5)	5,400,000,000	5,400,000,000	5,400,000,000		0				5,400,000,000
Debtor In Possession Financing, Liquidity Covenant, Unrestricted Cash Balance, Minimum									150,000,000
Debtor-In-Possession Financing, Incremental Junior Lien Debt Allowed, Maximum							$ 3,000,000,000