Shareholders' Equity - Additional Information (Detail) - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Partnerships Exchangeable Units
Stockholders Equity [Line Items]
Exchange of partnership exchangeable units for RBI common shares, shares	155,986
Restaurant Brands International Limited Partnership
Stockholders Equity [Line Items]
Partnership exchangeable units economic interest	48.90%	49.20%
Partnership exchangeable units economic interest, shares	226,839,418	226,995,404