Revenue Recognition - Contract Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Contract liabilities
Contract liabilities	$ 199	$ 208
Deferred Revenue Related To Prepaid Stored Value Products [Member]
Contract liabilities
Contract liabilities	133	134
Deferred Revenue Related To Upfront Franchise Fees [Member]
Contract liabilities
Contract liabilities	29	30
Deferred Revenue Related To Customer Loyalty Programs [Member]
Contract liabilities
Contract liabilities	22	25
Deferred Revenue Related To Privilege Membership Programs [Member]
Contract liabilities
Contract liabilities	14	18
Others [Member]
Contract liabilities
Contract liabilities	$ 1	$ 1