Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition (Narrative) (Details)

v3.20.2
Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]      
Franchise agreement, revenue recognition period (within)   12 years  
Co-branded credit card program, revenue recognition period (within)   1 year  
Capitalized Contract Cost [Line Items]      
Capitalized contract cost, net   $ 31 $ 33
Other Current Assets      
Capitalized Contract Cost [Line Items]      
Capitalized contract cost, net   6 8
Other Noncurrent Assets      
Capitalized Contract Cost [Line Items]      
Capitalized contract cost, net   $ 25 $ 25
Deferred loyalty program revenues      
Capitalized Contract Cost [Line Items]      
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress $ 16