Long-Term Debt (Schedule of Debt) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt	$ 16,998	$ 9,453
Current maturities of long-term debt	(199)	(167)
Long-term debt	16,799	9,286
Secured Debt [Member] | Credit Facility, Term Loan A [Member]
Debt Instrument [Line Items]
Debt	1,000	637
Secured Debt [Member] | Credit Facility, Term Loan B, Initial Funding [Member]
Debt Instrument [Line Items]
Debt		60
Secured Debt [Member] | Credit Facility, Term Loan C [Member]
Debt Instrument [Line Items]
Debt		3,353
Secured Debt [Member] | Credit Facility, Term Loan D [Member]
Debt Instrument [Line Items]
Debt	4,590
Secured Debt [Member] | Credit Facility, Term Loan E [Member]
Debt Instrument [Line Items]
Debt	1,672
Senior Notes [Member] | Senior Notes at 8.0, Due 2019 [Member]
Debt Instrument [Line Items]
Debt	2,020	2,020
Senior Notes [Member] | Senior Notes at 7.125, Due 2020 [Member]
Debt Instrument [Line Items]
Debt	1,200	1,200
Senior Notes [Member] | Senior Notes at 6.875, Due 2022 [Member]
Debt Instrument [Line Items]
Debt	3,000
Senior Secured Notes [Member] | Senior Secured Notes At 5.125 Due 2018 [Member]
Debt Instrument [Line Items]
Debt	1,600	1,600
Senior Secured Notes [Member] | Senior Secured Notes at 5.125, Due 2021 [Member]
Debt Instrument [Line Items]
Debt	1,000
Receivables Facility [Member] | Receivables Facility, Name [Member]
Debt Instrument [Line Items]
Debt	633	500
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt	214	46
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt	$ 69	$ 37