Quarterly report pursuant to Section 13 or 15(d)

Franchising, Marketing and Reservation Activities (Details)

v3.10.0.1
Franchising, Marketing and Reservation Activities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]          
Net Revenues $ 604 $ 347 $ 1,341 $ 967 $ 1,280
Interest earned on unpaid franchising development advance notes 0 0 1 1  
Bad debt expense (less than $1 million for both the three and nine months ended September 30, 2018 and 2017)     1 1  
Proceeds from development advance notes (less than $1 million for three months ended September 30, 2017) 1 1 11 4  
Development advances 11 1 22 5  
Franchisees and hotel owners          
Disaggregation of Revenue [Line Items]          
Development advance notes 76   $ 76   $ 64
Minimum          
Disaggregation of Revenue [Line Items]          
Franchise/management agreement term     10 years    
Maximum          
Disaggregation of Revenue [Line Items]          
Franchise/management agreement term     20 years    
Initial franchise fee revenue          
Disaggregation of Revenue [Line Items]          
Net Revenues 5 4 $ 14 11  
Forgiveness of note receivable          
Disaggregation of Revenue [Line Items]          
Net Revenues $ 2 $ 2 $ 5 $ 5