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Short-Term Borrowings And Long-Term Debt (Guarantees and Push Down of EFH Corp. Debt) (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Push Down Debt [Member]
Dec. 31, 2012
Push Down Debt [Member]
Sep. 30, 2013
Energy Future Holdings Corp. [Member]
Dec. 31, 2012
Energy Future Holdings Corp. [Member]
Sep. 30, 2013
Energy Future Holdings Corp. [Member]
Push Down Debt [Member]
Dec. 31, 2012
Energy Future Holdings Corp. [Member]
Push Down Debt [Member]
Sep. 30, 2013
Energy Future Competitive Holdings Company [Member]
Dec. 31, 2012
Energy Future Competitive Holdings Company [Member]
Sep. 30, 2013
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Senior Notes And Demand Notes Payable [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Senior Notes And Demand Notes Payable [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Senior Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Senior Notes [Member]
EFH Corp. 9.75% and 10% Senior Secured Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Senior Notes [Member]
Fixed Senior Secured 9.75% First Lien Notes due October 15, 2019 [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Senior Notes [Member]
EFH Corp. 10.875% Senior Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Senior Notes [Member]
EFH Corp. 11.25 / 12.00% Senior Toggle Notes [Member]
Sep. 30, 2013
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Demand Notes Payable [Member]
TCEH Demand Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Demand Notes Payable [Member]
TCEH Demand Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Held By EFIH [Member]
Senior Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Held By EFIH [Member]
Senior Notes [Member]
EFH Corp. 9.75% and 10% Senior Secured Notes [Member]
Dec. 31, 2011
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Held By EFIH [Member]
Senior Notes [Member]
Fixed Senior Secured 9.75% First Lien Notes due October 15, 2019 [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Held By EFIH [Member]
Senior Notes [Member]
EFH Corp. 10.875% Senior Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Held By EFIH [Member]
Senior Notes [Member]
EFH Corp. 11.25 / 12.00% Senior Toggle Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Subject to Push Down [Member]
Senior Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Subject to Push Down [Member]
Senior Notes [Member]
EFH Corp. 9.75% and 10% Senior Secured Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Subject to Push Down [Member]
Senior Notes [Member]
Fixed Senior Secured 9.75% First Lien Notes due October 15, 2019 [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Subject to Push Down [Member]
Senior Notes [Member]
EFH Corp. 10.875% Senior Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Subject to Push Down [Member]
Senior Notes [Member]
EFH Corp. 11.25 / 12.00% Senior Toggle Notes [Member]
Sep. 30, 2013
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Not Merger-Related [Member]
Senior Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Not Merger-Related [Member]
Senior Notes [Member]
Sep. 30, 2013
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Not Merger-Related [Member]
Senior Notes [Member]
EFH Corp. 9.75% and 10% Senior Secured Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Not Merger-Related [Member]
Senior Notes [Member]
EFH Corp. 9.75% and 10% Senior Secured Notes [Member]
Sep. 30, 2013
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Not Merger-Related [Member]
Senior Notes [Member]
Fixed Senior Secured 9.75% First Lien Notes due October 15, 2019 [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Not Merger-Related [Member]
Senior Notes [Member]
Fixed Senior Secured 9.75% First Lien Notes due October 15, 2019 [Member]
Sep. 30, 2013
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Not Merger-Related [Member]
Senior Notes [Member]
EFH Corp. 10.875% Senior Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Not Merger-Related [Member]
Senior Notes [Member]
EFH Corp. 10.875% Senior Notes [Member]
Sep. 30, 2013
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Not Merger-Related [Member]
Senior Notes [Member]
EFH Corp. 11.25 / 12.00% Senior Toggle Notes [Member]
Dec. 31, 2012
Financial guarantee [Member]
Energy Future Competitive Holdings Company [Member]
Not Merger-Related [Member]
Senior Notes [Member]
EFH Corp. 11.25 / 12.00% Senior Toggle Notes [Member]
Debt Instrument [Line Items]                                                                              
Debt and Capital Lease Obligations $ 103 $ 526 $ 30 $ 450         $ 73 $ 76                                                          
Securities Guaranteed (principal amounts)                         6,426 115 1,061 1,749 3,501     5,126 0 0 1,685 3,441 900 115 661 64 60   400   0   400   0   0
Intercompany payables         92 81                         698                                        
Total                       7,124                                                      
Debt Instrument, Principal Amounts Cancelled                                                           6,360   113   1,058   1,715   3,474  
Debt Instrument, Principal Amount Guarantee Obligations Of Subsidiaries Before Principal Amounts Cancelled                     $ 60             $ 0                       $ 60   $ 0   $ 0   $ 33   $ 27  
Debt Instrument, Percentage of principal plus unamortized premium of Parent Merger-related debt guaranteed by subsidiary             50.00% 50.00%