Fair Value Measurements and Disclosures - Schedule of Amounts Recognized From Non-recurring Fair Value Measurements (Details) - Fair Value, Measurements, Nonrecurring [Member] - Level 3 [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total expense recognized from non-recurring fair value measurements		$ 52	$ 121	$ 39
ASU 2016-02 [Member] | Cumulative Adjustment to Impairment on ROU Due to Adoption of New Accounting Pronouncement [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
ROU impairment prior to the adoption of ASC 842	[1]		82
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	[2]	$ 52	28	27
Daojia Impairment [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total expense recognized from non-recurring fair value measurements	[3]		$ 11	$ 12

[1] ROU impairment prior to the adoption of ASC 842 represents an impairment charge on operating lease ROU assets arising from existing operating leases as of January 1, 2019. After netting with the related impact on deferred taxes of $19 million and the impact on noncontrolling interests of $3 million, we recorded a cumulative adjustment of $60 million to retained earnings in accordance with the transition guidance for the new lease standard. For those restaurants under operating leases with full impairment on their long-lived assets (primarily property, plant and equipment) before January 1, 2019, an additional impairment charge would have been recorded before January 1, 2019 had the operating lease ROU assets been recognized at the time of impairment.

[2] 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. A trend of continuing operating losses for certain restaurants due to the COVID-19 pandemic resulted in higher impairment during 2020. We also performed an additional impairment evaluation upon adoption of ASC 842 in the first quarter of 2019. The remaining net book value of assets measured at fair value as of each relevant measurement date, after considering the impairment charges recorded during the years ended December 31, 2020 was $157 million. The remaining net book value of assets measured at fair value as of each relevant measurement date, after considering the impairment charges recorded during the years ended December 31, 2019 and December 2018, was insignificant.

[3] See Note 5 for further discussion.