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Amount of unamortized debt discount (premium) and debt issuance 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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Debt - Summary of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2016	Sep. 19, 2016	Dec. 31, 2015	Sep. 19, 2013
Debt Instrument [Line Items]
Gross Carrying Amount	$ 4,940		$ 4,119
Unamortized Discount and Deferred Financing Costs	(53)		(45)
Net Carrying Amount	4,887		4,074
Original 2021 Notes
Debt Instrument [Line Items]
Gross Carrying Amount				$ 1,500
2023 Notes
Debt Instrument [Line Items]
Gross Carrying Amount				$ 750
Credit Facilities \| Original Term Loan
Debt Instrument [Line Items]
Gross Carrying Amount			1,869
Unamortized Discount and Deferred Financing Costs			(11)
Net Carrying Amount			1,858
Credit Facilities \| 2016 TLA
Debt Instrument [Line Items]
Gross Carrying Amount	2,690
Unamortized Discount and Deferred Financing Costs	(27)
Net Carrying Amount	2,663
Unsecured Notes \| New 2021 Notes
Debt Instrument [Line Items]
Gross Carrying Amount	650	$ 650
Unamortized Discount and Deferred Financing Costs	(5)
Net Carrying Amount	645
Unsecured Notes \| Original 2021 Notes
Debt Instrument [Line Items]
Gross Carrying Amount			1,500
Unamortized Discount and Deferred Financing Costs			(22)
Net Carrying Amount			1,478
Unsecured Notes \| 2023 Notes
Debt Instrument [Line Items]
Gross Carrying Amount	750		750
Unamortized Discount and Deferred Financing Costs	(11)		(12)
Net Carrying Amount	739		$ 738
Unsecured Notes \| 2026 Notes
Debt Instrument [Line Items]
Gross Carrying Amount	850	$ 850
Unamortized Discount and Deferred Financing Costs	(10)
Net Carrying Amount	$ 840