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Fair Value of Financial Instruments (Schedule of Estimated Fair Value of Financial Instruments, by Balance Sheet Grouping) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Assets:    
Available-for-sale securities $ 268 $ 271
Trading securities 63 61
Liabilities:    
Contingent Value Right, Fair Value Disclosure 2 2
Carrying Amount Measurement [Member]    
Assets:    
Cash and cash equivalents 181 184
Available-for-sale securities 268 271
Trading securities 63 61
Liabilities:    
Contingent Value Right, Fair Value Disclosure 2 2
Carrying Amount Measurement [Member] | Credit Facility, Type of Debt [Member] | Credit Facility, Name [Member]    
Liabilities:    
Credit Facility, Fair Value Disclosure 7,255 7,114
Carrying Amount Measurement [Member] | Senior Notes [Member] | Senior Notes at 8.0, Due 2019 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 1,993 1,992
Carrying Amount Measurement [Member] | Senior Notes [Member] | Senior Notes at 7.125, Due 2020 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 1,187 1,186
Carrying Amount Measurement [Member] | Senior Notes [Member] | Senior Notes at 6.875, Due 2022 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 2,924 2,921
Carrying Amount Measurement [Member] | Senior Secured Notes [Member] | Senior Secured Notes At 5.125 Due 2018 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 1,588 1,587
Carrying Amount Measurement [Member] | Senior Secured Notes [Member] | Senior Secured Notes at 5.125, Due 2021 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 968 967
Carrying Amount Measurement [Member] | Receivables Facility and Other Debt, Type [Member] | Receivables Facility and Unsecured Debt [Member]    
Liabilities:    
Other Liabilities, Fair Value Disclosure 780 791
Estimate of Fair Value Measurement [Member]    
Assets:    
Cash and cash equivalents 181 184
Available-for-sale securities 268 271
Trading securities 63 61
Liabilities:    
Contingent Value Right, Fair Value Disclosure 2 2
Estimate of Fair Value Measurement [Member] | Credit Facility, Type of Debt [Member] | Credit Facility, Name [Member]    
Liabilities:    
Credit Facility, Fair Value Disclosure 7,255 7,115
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | Senior Notes at 8.0, Due 2019 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 1,954 2,018
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | Senior Notes at 7.125, Due 2020 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 1,141 1,193
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | Senior Notes at 6.875, Due 2022 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 2,715 2,858
Estimate of Fair Value Measurement [Member] | Senior Secured Notes [Member] | Senior Secured Notes At 5.125 Due 2018 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 1,615 1,610
Estimate of Fair Value Measurement [Member] | Senior Secured Notes [Member] | Senior Secured Notes at 5.125, Due 2021 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 1,010 997
Estimate of Fair Value Measurement [Member] | Receivables Facility and Other Debt, Type [Member] | Receivables Facility and Unsecured Debt [Member]    
Liabilities:    
Other Liabilities, Fair Value Disclosure $ 780 $ 791