Consolidating Guarantor Financial Information Income Statement (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues	$ 1,427	$ 1,483	$ 1,178	$ 863	$ 677	$ 665	$ 639	$ 540	$ 4,951	$ 2,521	$ 2,000
Costs and Expenses									4,968	2,466	1,970
Operating Income (Loss)	(218)	144	35	22	12	24	34	(15)	(17)	55	30
Income from unconsolidated affiliates									195	135	105
Interest expense, net									(304)	(164)	(122)
Loss on debt refinancing, net									(25)	(7)	(8)
Equity in Earnings of Subsidiaries									0	0	0
Other income and deductions, net									12	7	29	[1]
Income (Loss) from Continuing Operations before Income Taxes, Domestic									(139)	26	34
Income tax expense (benefit)									3	(1)	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									(142)	27	34
Net Income (Loss) Attributable to Noncontrolling Interest									(15)	(8)	(2)
Net Income (Loss) Attributable to Parent	(261)	103	(8)	9	(1)	39	10	(29)	(157)	19	32
Other Comprehensive Income (Loss), Net of Tax									0	0	2
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									(142)	27	36
Comprehensive income attributable to noncontrolling interest									15	8	2
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									(157)	19	34
Parent Company [Member]
Revenues									0	0	0
Costs and Expenses									0	3	10
Operating Income (Loss)									0	(3)	(10)
Income from unconsolidated affiliates									0	0	0
Interest expense, net									(290)	(148)	(104)
Loss on debt refinancing, net									(24)	(7)	(8)
Equity in Earnings of Subsidiaries									166	172	141
Other income and deductions, net									3	7	14
Income (Loss) from Continuing Operations before Income Taxes, Domestic									(145)	21	33
Income tax expense (benefit)									4	1	1
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									(149)	20	32
Net Income (Loss) Attributable to Noncontrolling Interest									0	0	0
Net Income (Loss) Attributable to Parent									(149)	20	32
Other Comprehensive Income (Loss), Net of Tax									0	0	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									(149)	20	32
Comprehensive income attributable to noncontrolling interest									0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									(149)	20	32
Guarantor Subsidiaries [Member]
Revenues									4,888	2,489	1,985
Costs and Expenses									4,942	2,448	1,951
Operating Income (Loss)									(54)	41	34
Income from unconsolidated affiliates									195	135	105
Interest expense, net									(14)	(16)	(18)
Loss on debt refinancing, net									(1)	0	0
Equity in Earnings of Subsidiaries									0	0	0
Other income and deductions, net									9	0	15
Income (Loss) from Continuing Operations before Income Taxes, Domestic									135	160	136
Income tax expense (benefit)									(2)	(2)	(1)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									137	162	137
Net Income (Loss) Attributable to Noncontrolling Interest									0	(8)	(2)
Net Income (Loss) Attributable to Parent									137	154	135
Other Comprehensive Income (Loss), Net of Tax									0	0	2
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									137	162	139
Comprehensive income attributable to noncontrolling interest									0	8	2
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									137	154	137
Non-Guarantor Subsidiaries [Member]
Revenues									66	32	15
Costs and Expenses									35	15	9
Operating Income (Loss)									31	17	6
Income from unconsolidated affiliates									0	0	0
Interest expense, net									0	0	0
Loss on debt refinancing, net									0	0	0
Equity in Earnings of Subsidiaries									0	0	0
Other income and deductions, net									0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic									31	17	6
Income tax expense (benefit)									1	0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									30	17	6
Net Income (Loss) Attributable to Noncontrolling Interest									0	0	0
Net Income (Loss) Attributable to Parent									30	17	6
Other Comprehensive Income (Loss), Net of Tax									0	0	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									30	17	6
Comprehensive income attributable to noncontrolling interest									0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									30	17	6
Consolidation, Eliminations [Member]
Revenues									(3)	0	0
Costs and Expenses									(9)	0	0
Operating Income (Loss)									6	0	0
Income from unconsolidated affiliates									0	0	0
Interest expense, net									0	0	0
Loss on debt refinancing, net									0	0	0
Equity in Earnings of Subsidiaries									(166)	(172)	(141)
Other income and deductions, net									0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic									(160)	(172)	(141)
Income tax expense (benefit)									0	0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									(160)	(172)	(141)
Net Income (Loss) Attributable to Noncontrolling Interest									(15)	0	0
Net Income (Loss) Attributable to Parent									(175)	(172)	(141)
Other Comprehensive Income (Loss), Net of Tax									0	0	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									(160)	(172)	(141)
Comprehensive income attributable to noncontrolling interest									15	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									$ (175)	$ (172)	$ (141)

[1] *Other income and deductions, net for the year ended December 31, 2012, included a one-time producer payment of $16 million related to an assignment of certain contracts.