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Equity Method Investments - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investment in subsidiaries	$ 0	$ 0
Equity method investment ownership percentage	50.00%
Increase to carrying value of equity method investment	$ 0	11,000,000	$ 20,000,000
Equity method investee
Schedule of Equity Method Investments [Line Items]
Accounts receivable from equity method investments	52,000,000	47,000,000
Carrols Restaurant Group, Inc.
Schedule of Equity Method Investments [Line Items]
Quoted market price	$ 59,000,000
BK Brasil
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage	9.40%
Quoted market price	$ 47,000,000
Tim Hortons \| Wendy's Company TIMWEN Partnership
Schedule of Equity Method Investments [Line Items]
Cash distributions	8,000,000	13,000,000	13,000,000
Rent expense	$ 15,000,000	19,000,000	$ 20,000,000
Canadian \| Wendy's Company TIMWEN Partnership
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage	50.00%
United States \| Carrols Restaurant Group, Inc.
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage	15.30%
Other assets, net
Schedule of Equity Method Investments [Line Items]
Investment in subsidiaries	$ 205,000,000	$ 266,000,000