Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Other	$ 80		$ 150
Less: unamortized deferred financing costs and deferred issue discount	(133)		(145)
Total debt, net	11,802		11,893
Less: current maturities of debt	(65)		(70)
Total long-term debt	11,737	$ 11,758	11,823
Term Loan Facility (due February 17, 2024)
Debt Instrument [Line Items]
Term Loan Facility (due February 17, 2024)	6,305		6,338
2017 4.25% Senior Notes (due May 15, 2024)
Debt Instrument [Line Items]
Senior notes	$ 1,500		1,500
Stated interest rate (as a percent)	4.25%
2015 4.625% Senior Notes (due January 15, 2022)
Debt Instrument [Line Items]
Senior notes	$ 1,250		1,250
Stated interest rate (as a percent)	4.625%
2017 5.00% Senior Notes (due October 15, 2025)
Debt Instrument [Line Items]
Senior notes	$ 2,800		$ 2,800
Stated interest rate (as a percent)	5.00%

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt classified as other.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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