Annual report pursuant to Section 13 and 15(d)

Revenue Recognition (Narrative) (Details)

v3.19.3.a.u2
Revenue Recognition (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
hotel
Dec. 31, 2018
USD ($)
Capitalized Contract Cost [Line Items]    
Capitalized contract costs $ 33 $ 24
Number of hotels from hotel ownership portfolio earning revenue | hotel 2  
Franchise agreement, revenue recognition period (within) 12 years  
Co-branded credit card program, revenue recognition period (within) 1 year  
Period between performance obligation satisfaction and customer payment (or less) 1 year  
Other current assets    
Capitalized Contract Cost [Line Items]    
Capitalized contract costs $ 8 8
Other non-current assets    
Capitalized Contract Cost [Line Items]    
Capitalized contract costs $ 25 $ 16