Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) restaurant	Dec. 31, 2019 USD ($) restaurant	Dec. 31, 2018 USD ($)
Summary Of Accounting Policies [Line Items]
Investment in other affiliates	50.00%
Goodwill and brand impairment	$ 0	$ 0	$ 0
Advertising expense, net of franchisee contributions	$ 857,000,000	$ 858,000,000	$ 793,000,000
Buildings and improvements
Summary Of Accounting Policies [Line Items]
Estimated useful life of assets (up to)	40 years
Restaurant equipment
Summary Of Accounting Policies [Line Items]
Estimated useful life of assets (up to)	17 years
Furniture, fixtures, and other
Summary Of Accounting Policies [Line Items]
Estimated useful life of assets (up to)	10 years
Manufacturing equipment
Summary Of Accounting Policies [Line Items]
Estimated useful life of assets (up to)	25 years
Restaurant VIEs
Summary Of Accounting Policies [Line Items]
Number of consolidated restaurants | restaurant	38	35