Fair Value of Financial Instruments - Liabilities, Recurring (Details) (USD $) In Millions, unless otherwise specified									12 Months Ended	65 Months Ended	12 Months Ended	24 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Fair Value, Measurements, Recurring Total Carrying Value in Consolidated Balance Sheet	Dec. 31, 2012 Fair Value, Measurements, Recurring Total Carrying Value in Consolidated Balance Sheet	Dec. 31, 2013 Fair Value, Measurements, Recurring Unadjusted quoted prices in active markets for identical assets or liabilities (Level 1)	Dec. 31, 2012 Fair Value, Measurements, Recurring Unadjusted quoted prices in active markets for identical assets or liabilities (Level 1)	Dec. 31, 2013 Fair Value, Measurements, Recurring Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Fair Value, Measurements, Recurring Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Tranche A Term Loan [Member]	Jul. 31, 2012 Tranche A Term Loan [Member]	Dec. 31, 2011 Tranche B II Term Loan Six Hundred Fifty Million Dollars [Member]	Oct. 04, 2013 Tranche B II Term Loan Six Hundred Fifty Million Dollars [Member]	Sep. 30, 2012 Tranche B III Term Loan Five Hundred Fifty Million Dollars [Member]	Dec. 31, 2011 Tranche B III Term Loan Five Hundred Fifty Million Dollars [Member]	Dec. 31, 2013 Tranche B 2016 Term Loan [Member]	Aug. 01, 2013 Tranche B 2016 Term Loan [Member]	Dec. 31, 2013 Tranche B 2019 Term Loan [Member]	Aug. 01, 2013 Tranche B 2019 Term Loan [Member]	Dec. 31, 2013 TrancheBII2019TermLoan [Member]	Oct. 04, 2013 TrancheBII2019TermLoan [Member]
Fair Value Disclosures [Abstract]
Carrying value of long-term debt, including current portion	$ 8,362	$ 8,732
Liabilities measured on a recurring basis
Debt Instrument, Description of Variable Rate Basis									LIBOR		LIBOR			LIBOR	LIBOR		LIBOR		LIBOR
Debt Instrument, Basis Spread on Variable Rate										2.25%		4.25%	4.25%			3.25%		3.75%		3.25%
Liabilities Recorded at Fair Value in the Financial Statements:
Interest Rate Swap Liabilities (included in other non-current liabilities)			12	56	0	0	12	56
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements			12	56	0	0	12	56
Long-term Debt, including the current portion:
Term Loans			2,604	2,603	2,633	2,631	0	0
Senior Notes			5,198	5,185	5,673	5,712	0	0
Convertible Notes			474	846	0	286	647	748
Capital Leases and Other			86	98	0	0	86	98
Total Long-term Debt, including the current portion:			$ 8,362	$ 8,732	$ 8,306	$ 8,629	$ 733	$ 846
Debt Instrument, Basis Floor											1.50%			1.50%	1.50%		1.50%		1.50%