Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition (Narrative) (Details)

v3.19.1
Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
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 costs $ 25 $ 24
Other Current Assets    
Capitalized Contract Cost [Line Items]    
Capitalized contract costs 6 8
Other Noncurrent Assets    
Capitalized Contract Cost [Line Items]    
Capitalized contract costs $ 19 $ 16