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Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Other	$ 150			$ 89
Less: unamortized deferred financing costs and deferred issuance discount	(145)			(170)
Total debt, net	11,893			11,858
Less: current maturities of debt	(70)			(57)
Total long-term debt	11,823		$ 11,801	11,801
Term Loan Facility (due February 17, 2024)
Debt Instrument [Line Items]
Term loan facility	6,338			6,389
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%