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Debt, Components of Long-Term Debt, Net of Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Total borrowings under long-term debt		$ 2,936		$ 2,940
Less: Long-term debt due within one year		(16)		(16)
Debt issuance costs		(33)		(36)
Long-term debt		$ 2,887		2,888
Average effective interest rate		5.00%	4.90%
Term Loan [Member]
Debt Instrument [Line Items]
Original principal	[1]	$ 1,500
Annual interest rate	[1]	Variable
Maturity date	[1]	Mar. 19, 2020
Total borrowings under long-term debt	[1]	$ 1,437		1,441
Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Original principal		$ 900
Annual interest rate		6.375%
Maturity date		Aug. 15, 2020
Total borrowings under long-term debt		$ 896		896
Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Original principal		$ 600
Annual interest rate		7.50%
Maturity date		Mar. 15, 2022
Total borrowings under long-term debt		$ 584		584
Lease Financing [Member]
Debt Instrument [Line Items]
Total borrowings under long-term debt		$ 19		$ 19
[1] Average effective interest rate of 5.0% and 4.9% during the three months ended March 31, 2017 and 2016, respectively.

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The description of variable rate of the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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The average effective interest rate during the reporting period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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