Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition (Narrative) (Details)

v3.10.0.1
Revenue Recognition (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
performance_obligations
hotel
Dec. 31, 2017
USD ($)
Revenue from Contract with Customer [Abstract]    
Number of performance obligations | performance_obligations 2  
Standard management agreement term (up to) 25 years  
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  
Capitalized contract costs | $ $ 27 $ 26
Period between performance obligation satisfaction and customer payment (or less) 1 year