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Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Oct. 05, 2020	Apr. 07, 2020	Nov. 19, 2019	Sep. 24, 2019	May 17, 2017
Debt Instrument [Line Items]
TH Facility and other	$ 175	$ 178
Less: unamortized deferred financing costs and deferred issue discount	(138)	(155)
Total debt, net	12,460	12,476
Less: current maturities of debt	(81)	(79)
Total long-term debt	12,379	12,397
Term Loan B (due November 19, 2026)
Debt Instrument [Line Items]
Term loan facility	5,256	5,297
Term Loan A (due October 7, 2024)
Debt Instrument [Line Items]
Term loan facility	$ 717	731
2017 4.25% Senior Notes (due May 15, 2024)
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.25%						4.25%
Senior notes	$ 0	775
3.875% First Lien Senior Notes (due January 15, 2028)
Debt Instrument [Line Items]
Stated interest rate (as a percent)	3.875%					3.875%
Senior notes	$ 1,550	750
2020 5.75% Senior Notes (due April 15, 2025)
Debt Instrument [Line Items]
Stated interest rate (as a percent)	5.75%			5.75%
Senior notes	$ 500	500
2020 3.50% Senior Notes (due February 15, 2029)
Debt Instrument [Line Items]
Stated interest rate (as a percent)	3.50%
Senior notes	$ 750	750
2019 4.375% Senior Notes (due January 15, 2028)
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.375%				4.375%
Senior notes	$ 750	750
2020 4.00% Senior Notes (due October 15, 2030)
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.00%		4.00%
Senior notes	$ 2,900	$ 2,900