Schedule I - CONDENSED STATEMENT OF CASH FLOWS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by/(used in) operating activities	$ 120	$ (735)	$ (99)
Cash flows from investing activities
Increase in restricted cash	(82)	(3,936)	(2,022)
Decrease in restricted cash	61	4,176	2,796
Other	(3)	68	(31)
Cash flows provided by/(used in) investing activities	(1,333)	(689)	65
Cash flows from financing activities
Issuance of common stock, net of fees	0	136	217
Proceeds from the issuance of long-term debt	310	4,436	6,039
Repayments of long-term debt	(450)	(2,833)	(6,605)
Other	25	(37)	(45)
Cash flows provided by/(used in) financing activities	(248)	1,514	651
Net increase in cash and cash equivalents	(1,468)	35	1,009
Cash and cash equivalents, beginning of period	2,806	2,771	1,758
Cash and cash equivalents, end of period	1,338	2,806	2,771
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows provided by/(used in) operating activities	(276)	152	408
Cash flows from investing activities
Increase in restricted cash	(44)	(56)	(140)
Decrease in restricted cash	20	20	89
Purchase of additional interest in subsidiary	0	0	(581)
Purchase of LINQ/Octavius	0	0	(81)
Proceeds paid for sale of assets	0	0	(29)
Other	40	0	0
Cash flows provided by/(used in) investing activities	16	(36)	(742)
Cash flows from financing activities
Issuance of common stock, net of fees	0	136	217
Proceeds from the issuance of long-term debt	0	13	0
Repayments of long-term debt	(68)	0	0
Transfer to affiliates	0	0	223
Other	(2)	0	0
Cash flows provided by/(used in) financing activities	(70)	149	440
Net increase in cash and cash equivalents	(330)	265	106
Cash and cash equivalents, beginning of period	378	113	7
Cash and cash equivalents, end of period	$ 48	$ 378	$ 113