Schedule I - CONDENSED BALANCE SHEETS (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 1,338	$ 2,806	$ 2,771	$ 1,758
Restricted cash	59	76
Prepayments and other current assets	128	225
Total current assets	1,771	3,668
Restricted cash	109	109
Deferred income taxes	28	16
Total assets	12,195	23,328
Liabilities and Stockholders’ Equity/(Deficit)
Accounts payable	179	349
Accrued expenses and other current liabilities	588	1,199
Interest payable	131	736
Current portion of long-term debt	187	15,779
Total current liabilities	2,006	18,063
Deferred credits and other	188	484
Deferred income taxes	991	2,293
Total liabilities	9,962	28,070
Total stockholders’ equity/(deficit)	987	(4,997)
Total liabilities and stockholders’ equity/(deficit)	12,195	23,328
Parent Company [Member]
Assets
Cash and cash equivalents	48	378	$ 113	$ 7
Restricted cash	0	11
Prepayments and other current assets	7	25
Intercompany receivables	18	10
Total current assets	73	424
Restricted cash	100	76
Deferred income taxes	0	4
Deferred charges and other	94	0
Intercompany receivables	0	40
Investment in subsidiary	1,871	0
Total assets	2,138	544
Liabilities and Stockholders’ Equity/(Deficit)
Accounts payable	4	0
Accrued expenses and other current liabilities	940	0
Interest payable	0	1
Intercompany payables	0	6
Current portion of long-term debt	0	13
Total current liabilities	944	20
Accumulated losses of subsidiaries in excess of investment	0	5,214
Deferred credits and other	53	2
Deferred income taxes	154	0
Intercompany payables	0	55
Total liabilities	1,151	5,291
Total stockholders’ equity/(deficit)	987	(4,747)
Total liabilities and stockholders’ equity/(deficit)	$ 2,138	$ 544