Annual report pursuant to Section 13 and 15(d)

Revenue Recognition (Contract Liabilities) (Details)

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Revenue Recognition (Contract Liabilities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Contract liabilities $ 235 $ 229
Deferred initial franchise fee revenue    
Disaggregation of Revenue [Line Items]    
Contract liabilities 145 136
Deferred loyalty program revenue    
Disaggregation of Revenue [Line Items]    
Contract liabilities 76 75
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress   16
Product and Service, Other [Member]    
Disaggregation of Revenue [Line Items]    
Contract liabilities $ 14 $ 18
Maximum    
Disaggregation of Revenue [Line Items]    
Standard Management Agreement, Term 20 years  
Minimum    
Disaggregation of Revenue [Line Items]    
Standard Management Agreement, Term 10 years