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Subsequent Events - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Oct. 03, 2019
Oct. 28, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Oct. 07, 2019
Sep. 24, 2019
May 22, 2015
Subsequent Event [Line Items]                      
Cash dividend declared by board (in usd per share)     $ 0.7 $ 0.63 $ 0.63 $ 0.56 $ 0.56 $ 0.55      
Subsequent Event                      
Subsequent Event [Line Items]                      
Cash dividend paid per common share (in usd per share) $ 0.50                    
Cash dividend declared by board (in usd per share)   $ 0.50                  
Partnership Exchangeable Units | Restaurant Brands International Limited Partnership | Subsequent Event                      
Subsequent Event [Line Items]                      
Cash dividend paid per exchangeable unit (in usd per unit) $ 0.50 $ 0.50                  
2019 3.875% Senior Notes (Due January 15, 2028)                      
Subsequent Event [Line Items]                      
Stated interest rate (as a percent)                   3.875%  
2015 4.625% Senior Notes (due January 15, 2022)                      
Subsequent Event [Line Items]                      
Stated interest rate (as a percent)                     4.625%
Revolving Credit Facility | Subsequent Event                      
Subsequent Event [Line Items]                      
Maximum borrowing capacity                 $ 1,000,000,000