Revenue Recognition Accounting Policy (Details 3) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total Revenues		$ 1,263	$ 1,254
Deferred Revenue		424		$ 441
Deferred Revenue, Revenue Recognized		(19)
Deferred Revenue, Additions		15
Foreign Currency Gain (Loss) and Refranchising Gain (Loss) [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred Revenue, Period Increase (Decrease)	[1]	$ (13)

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