Segment Reporting - Revenues by Operating Segment and Country (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue, Major Customer [Line Items]
Total revenues	$ 1,337	$ 1,458	$ 3,610	$ 4,124
Canada
Revenue, Major Customer [Line Items]
Total revenues	691	805	1,837	2,245
United States
Revenue, Major Customer [Line Items]
Total revenues	499	489	1,392	1,412
Other
Revenue, Major Customer [Line Items]
Total revenues	147	164	381	467
Tim Hortons
Revenue, Major Customer [Line Items]
Total revenues	762	881	2,028	2,472
Burger King
Revenue, Major Customer [Line Items]
Total revenues	433	457	1,168	1,315
Popeyes
Revenue, Major Customer [Line Items]
Total revenues	$ 142	$ 120	$ 414	$ 337