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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
Dec. 31, 2015
Dec. 31, 2014
Assets:    
Available-for-sale securities $ 271 $ 280
Trading securities 61 55
Liabilities:    
Contingent Value Right, Fair Value Disclosure 2 6
Carrying Amount Measurement [Member]    
Assets:    
Cash and cash equivalents 184 509
Available-for-sale securities 271 280
Trading securities 61 55
Liabilities:    
Contingent Value Right, Fair Value Disclosure 2 6
Carrying Amount Measurement [Member] | Credit Facility, Type of Debt [Member] | Credit Facility, Name [Member]    
Liabilities:    
Credit Facility, Fair Value Disclosure 7,217 7,165
Carrying Amount Measurement [Member] | Senior Notes [Member] | Senior Notes at 8.0, Due 2019 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 2,015 2,018
Carrying Amount Measurement [Member] | Senior Notes [Member] | Senior Notes at 7.125, Due 2020 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 1,200 1,200
Carrying Amount Measurement [Member] | Senior Notes [Member] | Senior Notes at 6.875, Due 2022 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 3,000 3,000
Carrying Amount Measurement [Member] | Senior Secured Notes [Member] | Senior Secured Notes At 5.125 Due 2018 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 1,600 1,600
Carrying Amount Measurement [Member] | Senior Secured Notes [Member] | Senior Secured Notes at 5.125, Due 2021 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 1,000 1,000
Carrying Amount Measurement [Member] | Receivables Facility and Other Debt, Type [Member] | Receivables Facility and Unsecured Debt [Member]    
Liabilities:    
Other Liabilities, Fair Value Disclosure 792 705
Estimate of Fair Value Measurement [Member]    
Assets:    
Cash and cash equivalents 184 509
Available-for-sale securities 271 280
Trading securities 61 55
Liabilities:    
Contingent Value Right, Fair Value Disclosure 2 6
Estimate of Fair Value Measurement [Member] | Credit Facility, Type of Debt [Member] | Credit Facility, Name [Member]    
Liabilities:    
Credit Facility, Fair Value Disclosure 7,115 7,143
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | Senior Notes at 8.0, Due 2019 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 2,018 2,139
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | Senior Notes at 7.125, Due 2020 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 1,193 1,282
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | Senior Notes at 6.875, Due 2022 [Member]    
Liabilities:    
Notes Payable, Fair Value Disclosure 2,858 3,194
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 1,610 1,655
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 997 1,041
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 $ 792 $ 705