Fair Value Measurements and Disclosures - Schedule of Amounts Recognized From Non-recurring Fair Value Measurements (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total expense recognized from non-recurring fair value measurements		$ 3	$ 12
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total expense recognized from non-recurring fair value measurements			9
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Restaurant-level impairment [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total expense recognized from non-recurring fair value measurements	[1]		$ 9

[1] Restaurant-level impairment charges are recorded in Closures and impairment expenses, net and resulted primarily from our semi-annual impairment evaluation of long-lived assets of individual restaurants that were being operated at the time of impairment and had not been offered for refranchising. We performed an additional impairment evaluation in the first quarter of 2020, considering the adverse effects of the COVID-19 pandemic as an impairment indicator. The fair value of assets as of the relevant measurement date, after considering the impairment charges recorded during the quarter ended March 31, 2020, was $29 million.