Shareholders' Equity - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Jul. 28, 2021
Stockholders Equity [Line Items]
Number of shares authorized to be repurchased (in shares)			1,000,000,000
Number of shares repurchased and cancelled (in shares)	2,860,002
Amount of shares repurchased and cancelled	$ 161
Remaining authorized repurchase amount	$ 288
Partnerships Exchangeable Units
Stockholders Equity [Line Items]
Exchange of partnership exchangeable units for RBI common shares (in shares)	1,525,900
Restaurant Brands International Limited Partnership
Stockholders Equity [Line Items]
Partnership exchangeable units economic interest	31.70%	31.90%
Partnership exchangeable units economic interest (in shares)	143,467,558	144,993,458