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Long-Term Debt (Issuances of EFIH 6.875% Senior Secured Notes in 2012) (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Secured Debt [Member]
Dec. 31, 2011
Secured Debt [Member]
Sep. 30, 2012
Secured Debt [Member]
6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]
Dec. 31, 2011
Secured Debt [Member]
6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]
Sep. 30, 2012
Secured Debt [Member]
11.75% Senior Secured Second Lien Notes due March 1, 2022 [Member]
Dec. 31, 2011
Secured Debt [Member]
11.75% Senior Secured Second Lien Notes due March 1, 2022 [Member]
Sep. 30, 2012
Energy Future Intermediate Holding CO LLC [Member]
Secured Debt [Member]
6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]
Aug. 31, 2012
Energy Future Intermediate Holding CO LLC [Member]
Secured Debt [Member]
6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]
Sep. 30, 2012
Energy Future Intermediate Holding CO LLC [Member]
Secured Debt [Member]
11.75% Senior Secured Second Lien Notes due March 1, 2022 [Member]
Aug. 31, 2012
Energy Future Intermediate Holding CO LLC [Member]
Secured Debt [Member]
11.75% Senior Secured Second Lien Notes due March 1, 2022 [Member]
Feb. 29, 2012
Energy Future Intermediate Holding CO LLC [Member]
Secured Debt [Member]
11.75% Senior Secured Second Lien Notes due March 1, 2022 [Member]
Oct. 31, 2012
Energy Future Intermediate Holding CO LLC [Member]
Issuance of Debt [Member]
Secured Debt [Member]
6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]
Aug. 31, 2012
Energy Future Intermediate Holding CO LLC [Member]
Amounts in Escrow Related to August 2012 Debt Issuances [Member]
Secured Debt [Member]
11.75% Senior Secured Second Lien Notes due March 1, 2022 [Member]
Sep. 30, 2012
Energy Future Intermediate Holding CO LLC [Member]
Indirect Guarantee of Indebtedness [Member]
TCEH to EFH [Member]
Line of Credit [Member]
Dec. 31, 2011
Energy Future Intermediate Holding CO LLC [Member]
Indirect Guarantee of Indebtedness [Member]
TCEH to EFH [Member]
Line of Credit [Member]
Sep. 30, 2012
Energy Future Intermediate Holding CO LLC [Member]
Oncor Holdings [Member]
Secured Debt [Member]
6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]
Sep. 30, 2012
Energy Future Intermediate Holding CO LLC [Member]
Until February 15, 2015 [Member]
Secured Debt [Member]
6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]
Sep. 30, 2012
Energy Future Intermediate Holding CO LLC [Member]
February 15, 2015 and Thereafter [Member]
Secured Debt [Member]
6.875% Fixed Senior Secured First Lien Notes due August 15, 2017 [Member]
Debt Instrument [Line Items]                                        
Debt Instrument, Face Amount                   $ 250   $ 600 $ 1,150 $ 253            
Unamortized premium     14 0               14   8            
Restricted cash 680 0                         680          
Long-term debt, gross         $ 250 $ 0 $ 1,750 $ 0               $ 689 $ 1,592      
Pledged Ownership Membership Interest Percentage                                   100.00%    
Debt Instrument Redemption Percentage Maximum                                     35.00%  
Senior Notes Redemption Price Percentage Of Principal                                     106.875%  
Debt Instrument Redemption Price Percentage Of Principal Amount Plus Premium And Accrued Interest                                     100.00%  
Senior Notes Redemption Price Expressed As Percentage Of Principal Amount Redeemed, Plus Accrued Interest                                       101.00%
Debt Instrument, Registration Default, if not filed and declared effective after original issue date, days                 365   365                  
Debt Instrument, Registration Default, if not filed and declared effective after original issue date, variable interest rate increase for quarter                 0.25%   0.25%                  
Debt Instrument, Registration Default, if not filed and declared effective after original issue date, first quarter annual interest rate                 90   90                  
Debt Instrument, Registration Default, if not filed and declared effective after original issue date, variable interest rate increase after initial increase                 0.50%   0.50%