Description of Business and Organization - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) restaurant country	Sep. 30, 2019 USD ($)
Basis Of Presentation [Line Items]
Number of franchised or owned restaurants	27,027
Number of countries in which company and franchise restaurants operated (more than) | country	100
Percentage of franchised Tim Hortons, Burger King, and Popeyes restaurants	100.00%
Bad debt expense | $	$ 27	$ 3
Tim Hortons brand
Basis Of Presentation [Line Items]
Number of franchised or owned restaurants	4,934
Burger King brand
Basis Of Presentation [Line Items]
Number of franchised or owned restaurants	18,675
Popeyes brand
Basis Of Presentation [Line Items]
Number of franchised or owned restaurants	3,418