Fair Value of Financial Instruments (Schedule of Estimated Fair Value of Financial Instruments, by Balance Sheet Grouping) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Assets:
Investments in equity securities	$ 149
Available-for-sale securities	119	$ 252
Trading securities		37
Liabilities:
Contingent Value Right, Fair Value Disclosure	3	2
Carrying Amount Measurement [Member]
Assets:
Cash and cash equivalents	424	563
Investments in equity securities	149
Available-for-sale securities	119	252
Trading securities		37
Liabilities:
Contingent Value Right, Fair Value Disclosure	3	2
Carrying Amount Measurement [Member] \| Credit Facility, Type of Debt [Member] \| Credit Facility, Name [Member]
Liabilities:
Credit Facility, Fair Value Disclosure	2,899	2,902
Carrying Amount Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 8.0, Due 2019 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	1,922	1,922
Carrying Amount Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 7.125, Due 2020 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	1,192	1,192
Carrying Amount Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 6.875, Due 2022 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	2,946	2,943
Carrying Amount Measurement [Member] \| Senior Secured Notes [Member] \| Senior Secured Notes at 5.125, Due 2021 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	979	978
Carrying Amount Measurement [Member] \| Senior Secured Notes [Member] \| Senior Secured Notes at 6.25, Due 2023 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	3,063	3,061
Carrying Amount Measurement [Member] \| Receivables Facility and Other Debt, Type [Member] \| Receivables Facility and Unsecured Debt [Member]
Liabilities:
Other Liabilities, Fair Value Disclosure	589	611
Estimate of Fair Value Measurement [Member]
Assets:
Cash and cash equivalents	424	563
Investments in equity securities	149
Available-for-sale securities	119	252
Trading securities		37
Liabilities:
Contingent Value Right, Fair Value Disclosure	3	2
Estimate of Fair Value Measurement [Member] \| Credit Facility, Type of Debt [Member] \| Credit Facility, Name [Member]
Liabilities:
Credit Facility, Fair Value Disclosure	2,848	2,826
Estimate of Fair Value Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 8.0, Due 2019 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	1,738	1,637
Estimate of Fair Value Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 7.125, Due 2020 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	978	897
Estimate of Fair Value Measurement [Member] \| Senior Notes [Member] \| Senior Notes at 6.875, Due 2022 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	1,743	1,729
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	933	902
Estimate of Fair Value Measurement [Member] \| Senior Secured Notes [Member] \| Senior Secured Notes at 6.25, Due 2023 [Member]
Liabilities:
Notes Payable, Fair Value Disclosure	2,855	2,800
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	$ 589	$ 611

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of notes payable.

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Fair value portion of other liabilities.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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