Other Operating Expenses (Income), net - Other Operating Expenses (Income), Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Income and Expenses [Abstract]
Net losses (gains) on disposal of assets, restaurant closures, and refranchisings	$ 4	$ 6	$ 2	$ (1)
Litigation settlements (gains) and reserves, net	4	1	5	1
Net losses (gains) on foreign exchange	44	(35)	54	(38)
Other, net	2	(2)	(2)	(6)
Other operating expenses (income), net	$ 54	$ (30)	$ 59	$ (44)