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Equity Method Investments - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Investment in subsidiaries	$ 0		$ 0		$ 0
Impairment, equity method investments			0
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Accounts receivable from equity method investments	64,000,000		64,000,000		47,000,000
Wendy's Company TIMWEN Partnership \| Tim Hortons brand
Schedule of Equity Method Investments [Line Items]
Cash distributions	2,000,000	$ 5,000,000	4,000,000	$ 7,000,000
Rent expense	3,000,000	$ 5,000,000	7,000,000	$ 9,000,000
Carrols Restaurant Group, Inc.
Schedule of Equity Method Investments [Line Items]
Quoted market price	$ 46,000,000		$ 46,000,000
BK Brasil
Schedule of Equity Method Investments [Line Items]
Joint-venture interest	9.80%		9.80%
Quoted market price	$ 47,000,000		$ 47,000,000
Canada \| Wendy's Company TIMWEN Partnership
Schedule of Equity Method Investments [Line Items]
Joint-venture interest	50.00%		50.00%
United States \| Carrols Restaurant Group, Inc.
Schedule of Equity Method Investments [Line Items]
Joint-venture interest	15.20%		15.20%
Other assets
Schedule of Equity Method Investments [Line Items]
Investment in subsidiaries	$ 216,000,000		$ 216,000,000		$ 266,000,000