Schedule I Schedule I - CONDENSED STATEMENT OF CASH FLOWS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			48 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ (735)	$ (99)	$ 33	$ 772
Cash flows from investing activities
Change in restricted cash	240	774	(681)
Payments to acquire businesses, net of transaction costs and cash acquired	(23)	(20)	(38)
Other	25	(51)	(34)
Cash flows from investing activities	(689)	65	(1,225)
Cash flows from financing activities
Issuance of common stock, net of fees	136	217	17
Other	(37)	(45)	(27)
Cash flows from financing activities	1,514	651	1,473
Net increase/(decrease) in cash and cash equivalents	35	1,009	858
Cash and cash equivalents, beginning of period	2,771	1,758	891
Cash and cash equivalents, end of period	2,806	2,771	1,758	2,806
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	152	408	259
Cash flows from investing activities
Change in restricted cash	(36)	(51)	0
Purchase of additional interests in subsidiaries	0	(581)	(233)
Purchase of LINQ/Octavius from non-guarantor	0	(81)	0
Proceeds paid for sale of assets	0	(29)	0
Other	0	0	(1)
Cash flows from investing activities	(36)	(742)	(234)
Cash flows from financing activities
Issuance of common stock, net of fees	136	217	17
Other	13	0	0
Transfer to affiliates	0	223	(39)
Cash flows from financing activities	149	440	(22)
Net increase/(decrease) in cash and cash equivalents	265	106	3
Cash and cash equivalents, beginning of period	113	7	4
Cash and cash equivalents, end of period	$ 378	$ 113	$ 7	$ 378