Segment Reporting - Reconciliation of Segment Income to Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Adjusted EBITDA	$ 561			$ 602			$ 1,363	$ 1,682
Impact of equity method investments	18			(11)			36	(11)
Other operating expenses (income), net	54			(30)			59	(44)
EBITDA	465			618			1,188	1,635
Depreciation and amortization	48			47			139	139
Income from operations	417			571			1,049	1,496
Interest expense, net	129			137			376	406
Loss on early extinguishment of debt	0			4			0	4
Income tax expense	65			79			62	232
Net income	223	$ 164	$ 224	351	$ 257	$ 246	611	854
Unallocated Management G&A
Segment Reporting, Revenue Reconciling Item [Line Items]
Share-based compensation and non-cash incentive compensation expense	19			18			63	62
Corporate restructuring and tax advisory fees	3			5			11	22
Office centralization and relocation costs	0			0			0	6
Impact of equity method investments	20			(9)			42	1
Other operating expenses (income), net	54			(30)			59	(44)
Tim Hortons | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Adjusted EBITDA	258			301			594	825
Burger King | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Adjusted EBITDA	245			254			605	728
Popeyes | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Adjusted EBITDA	$ 58			$ 47			$ 164	$ 129