Supplemental Guarantor Condensed Financial Information (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities			$ 203	$ 383
Cash flows – financing activities:
Proceeds from TCEH DIP Facility before fees paid (Note 8)			0	1,425
Fees paid for TCEH DIP Facility			0	(87)
Notes/advances due to affiliates			0	0
Repayments/repurchases of debt			(24)	(224)
Contributions from noncontrolling interests				1
Cash provided by (used in) financing activities			(24)	1,115
Cash flows – investing activities:
Capital expenditures			(275)	(254)
Nuclear fuel purchases			(77)	(76)
Settlements of notes/advances due from affiliates			0	(17)
Changes in restricted cash			33	194
Proceeds from sales of nuclear decommissioning trust fund securities (Note 15)	$ 242	$ 165	315	250
Investments in nuclear decommissioning trust fund securities (Note 15)	(247)	(170)	(328)	(263)
Other, net			12	0
Cash provided by (used in) investing activities			(320)	(166)
Net change in cash and cash equivalents			(141)	1,332
Cash and cash equivalents – beginning balance			1,843	746
Cash and cash equivalents – ending balance	1,702	2,078	1,702	2,078
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities			(6)	(4)
Cash flows – financing activities:
Proceeds from TCEH DIP Facility before fees paid (Note 8)				0
Fees paid for TCEH DIP Facility				0
Notes/advances due to affiliates			10	8
Repayments/repurchases of debt			(4)	(4)
Contributions from noncontrolling interests				0
Cash provided by (used in) financing activities			6	4
Cash flows – investing activities:
Capital expenditures			0	0
Nuclear fuel purchases			0	0
Settlements of notes/advances due from affiliates			0	0
Changes in restricted cash			0	0
Proceeds from sales of nuclear decommissioning trust fund securities (Note 15)			0	0
Investments in nuclear decommissioning trust fund securities (Note 15)			0	0
Other, net			0
Cash provided by (used in) investing activities			0	0
Net change in cash and cash equivalents			0	0
Cash and cash equivalents – beginning balance			0	0
Cash and cash equivalents – ending balance	0	0	0	0
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities			(1,159)	(1,122)
Cash flows – financing activities:
Proceeds from TCEH DIP Facility before fees paid (Note 8)				1,425
Fees paid for TCEH DIP Facility				(87)
Notes/advances due to affiliates			985	1,121
Repayments/repurchases of debt			0	(203)
Contributions from noncontrolling interests				0
Cash provided by (used in) financing activities			985	2,256
Cash flows – investing activities:
Capital expenditures			(15)	0
Nuclear fuel purchases			0	0
Settlements of notes/advances due from affiliates			0	0
Changes in restricted cash			31	194
Proceeds from sales of nuclear decommissioning trust fund securities (Note 15)			0	0
Investments in nuclear decommissioning trust fund securities (Note 15)			0	0
Other, net			0
Cash provided by (used in) investing activities			16	194
Net change in cash and cash equivalents			(158)	1,328
Cash and cash equivalents – beginning balance			1,826	725
Cash and cash equivalents – ending balance	1,668	2,053	1,668	2,053
Other Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities			1,369	1,514
Cash flows – financing activities:
Proceeds from TCEH DIP Facility before fees paid (Note 8)				0
Fees paid for TCEH DIP Facility				0
Notes/advances due to affiliates			0	0
Repayments/repurchases of debt			(20)	(17)
Contributions from noncontrolling interests				0
Cash provided by (used in) financing activities			(20)	(17)
Cash flows – investing activities:
Capital expenditures			(260)	(254)
Nuclear fuel purchases			(77)	(76)
Settlements of notes/advances due from affiliates			(997)	(1,146)
Changes in restricted cash			2	0
Proceeds from sales of nuclear decommissioning trust fund securities (Note 15)			315	250
Investments in nuclear decommissioning trust fund securities (Note 15)			(328)	(263)
Other, net			3
Cash provided by (used in) investing activities			(1,342)	(1,489)
Net change in cash and cash equivalents			7	8
Cash and cash equivalents – beginning balance			16	16
Cash and cash equivalents – ending balance	23	24	23	24
Non-guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities			(1)	(5)
Cash flows – financing activities:
Proceeds from TCEH DIP Facility before fees paid (Note 8)				0
Fees paid for TCEH DIP Facility				0
Notes/advances due to affiliates			2	0
Repayments/repurchases of debt			0	0
Contributions from noncontrolling interests				1
Cash provided by (used in) financing activities			2	1
Cash flows – investing activities:
Capital expenditures			0	0
Nuclear fuel purchases			0	0
Settlements of notes/advances due from affiliates			0	0
Changes in restricted cash			0	0
Proceeds from sales of nuclear decommissioning trust fund securities (Note 15)			0	0
Investments in nuclear decommissioning trust fund securities (Note 15)			0	0
Other, net			9
Cash provided by (used in) investing activities			9	0
Net change in cash and cash equivalents			10	(4)
Cash and cash equivalents – beginning balance			1	5
Cash and cash equivalents – ending balance	11	1	11	1
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities			0	0
Cash flows – financing activities:
Proceeds from TCEH DIP Facility before fees paid (Note 8)				0
Fees paid for TCEH DIP Facility				0
Notes/advances due to affiliates			(997)	(1,129)
Repayments/repurchases of debt			0	0
Contributions from noncontrolling interests				0
Cash provided by (used in) financing activities			(997)	(1,129)
Cash flows – investing activities:
Capital expenditures			0	0
Nuclear fuel purchases			0	0
Settlements of notes/advances due from affiliates			997	1,129
Changes in restricted cash			0	0
Proceeds from sales of nuclear decommissioning trust fund securities (Note 15)			0	0
Investments in nuclear decommissioning trust fund securities (Note 15)			0	0
Other, net			0
Cash provided by (used in) investing activities			997	1,129
Net change in cash and cash equivalents			0	0
Cash and cash equivalents – beginning balance			0	0
Cash and cash equivalents – ending balance	$ 0	$ 0	$ 0	$ 0