Segment Reporting - Reconciliation of Segment Income to Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Adjusted EBITDA	$ 358		$ 580		$ 802	$ 1,080
Impact of equity method investments	16		2		18	0
Other operating expenses (income), net	21		3		5	(14)
EBITDA	289		536		723	1,017
Depreciation and amortization	46		45		91	92
Income from operations	243		491		632	925
Interest expense, net	128		137		247	269
Income tax (benefit) expense	(49)		97		(3)	153
Net income	164	$ 224	257	$ 246	388	503
Unallocated Management G&A
Segment Reporting, Revenue Reconciling Item [Line Items]
Share-based compensation and non-cash incentive compensation expense	23		19		44	44
Corporate restructuring and tax advisory fees	7		11		8	17
Office centralization and relocation costs	0		2		0	6
Impact of equity method investments	18		9		22	10
Other operating expenses (income), net	21		3		5	(14)
Tim Hortons | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Adjusted EBITDA	147		287		336	524
Burger King | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Adjusted EBITDA	160		252		360	474
Popeyes | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Adjusted EBITDA	$ 51		$ 41		$ 106	$ 82