Schedule I - CONDENSED STATEMENT OF COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net revenues	$ 1,119	$ 1,141	$ 1,141	$ 1,253	$ 2,131	$ 2,212	$ 2,140	$ 2,033	$ 4,654	$ 8,516	$ 8,220
Operating expenses
Corporate expense									176	282	161
Other operating costs									152	236	203
Total operating expenses									4,081	8,968	10,246
Loss from operations	$ 104	$ 139	$ 186	$ 144	$ (402)	$ (328)	$ 127	$ 151	573	(452)	(2,026)
Interest expense									(684)	(2,670)	(2,252)
Gain on investment in subsidiaries and other									6,115	(95)	28
Income/(loss) from operations before income taxes									6,004	(3,217)	(4,250)
Income tax benefit									55	543	1,517
Net income/(loss)									6,059	(2,674)	(2,733)
Other comprehensive income, net of income taxes									0	(2)	(38)
Comprehensive income/(loss)									5,920	(2,785)	(2,986)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues									12	0	0
Operating expenses
Income on interests in non-consolidated affiliates									0	(1)	(1)
(Gain)/loss on interests in subsidiaries									(144)	2,765	2,923
Corporate expense									95	14	16
Other operating costs									111	10	0
Total operating expenses									62	2,788	2,938
Loss from operations									(50)	(2,788)	(2,938)
Interest expense									(4)	(3)	2
Gain on investment in subsidiaries and other									6,110	15	23
Income/(loss) from operations before income taxes									6,056	(2,776)	(2,913)
Income tax benefit									(136)	(7)	0
Net income/(loss)									5,920	(2,783)	(2,913)
Other comprehensive income, net of income taxes									0	0	0
Comprehensive income/(loss)									$ 5,920	$ (2,783)	$ (2,913)