Long-Term Debt (Schedule of Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt	$ 13,892	$ 13,913
Less: Current maturities	(37)	(33)
Long-term debt	13,855	13,880
Secured Debt [Member] \| Credit Facility, Term Loan G [Member]
Debt Instrument [Line Items]
Debt	1,037	1,037
Secured Debt [Member] \| Credit Facility, Term Loan H [Member]
Debt Instrument [Line Items]
Debt	1,903	1,903
Senior Notes [Member] \| Senior Notes at 8.0, Due 2019 [Member]
Debt Instrument [Line Items]
Debt	1,925	1,925
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	3,000
Senior Notes [Member] \| Senior Secured Notes at 6.25, Due 2023 [Member]
Debt Instrument [Line Items]
Debt	3,100	3,100
Senior Secured Notes [Member] \| Senior Secured Notes at 5.125, Due 2021 [Member]
Debt Instrument [Line Items]
Debt	1,000	1,000
Receivables Facility [Member] \| Receivables Facility, Name [Member]
Debt Instrument [Line Items]
Debt	538	565
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt	301	304
Unsecured Debt [Member]
Debt Instrument [Line Items]
Less: Unamortized deferred debt issuance costs and note premium	(164)	(169)
Debt	$ 52	$ 48

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-Name Accounting Standards Codification
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