Reorganization Items (Details) - USD ($) $ in Millions	3 Months Ended		5 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reorganization Items [Abstract]
Noncash liability adjustment arising from termination of interest rate swaps (Note 13)	$ 0	$ 0	$ 277	$ 0	$ 277
Fees associated with completion of TCEH DIP Facility	0	(5)	87	0	87
Expenses related to legal advisory and representation services	25	30	51	75
Expenses related to other professional consulting and advisory services	12	20	52	46
Contract claims adjustments	0	0	0	28	0
Other	2	0	1	3
Total reorganization items	$ 39	$ 45	$ 468	$ 152	$ 468