Segment Reporting - Revenues by Operating Segment and Country (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue, Major Customer [Line Items]
Total revenues	$ 1,400	$ 1,343	$ 2,666	$ 2,597
Canada
Revenue, Major Customer [Line Items]
Total revenues	764	746	1,440	1,438
United States
Revenue, Major Customer [Line Items]
Total revenues	479	450	923	871
Other
Revenue, Major Customer [Line Items]
Total revenues	157	147	303	288
Tim Hortons brand
Revenue, Major Customer [Line Items]
Total revenues	842	823	1,591	1,586
Burger King brand
Revenue, Major Customer [Line Items]
Total revenues	447	418	858	808
Popeyes brand
Revenue, Major Customer [Line Items]
Total revenues	$ 111	$ 102	$ 217	$ 203