Revenue Recognition Accounting Policy (Details 2) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2021	Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred Revenue		$ 413	$ 415
Revenue recognized that was included in unamortized upfront fees received from franchisees at the beginning of the period		(34)
Increase for upfront fees associated with contracts that became effective during the period, net of amounts recognized as revenue during the period		34
Foreign Currency Gain (Loss) and Refranchising Gain (Loss) [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Other	[1]	$ (2)

[1] (a)    Primarily includes impact of foreign currency translation.