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 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]          
Net Revenues $ 435 $ 331 $ 737 $ 620 $ 1,280
Bad debt expense (less than) 1 1 1 1  
Proceeds from development advance notes 2 2 10 4  
Development advances 8 1 11 4  
Franchisees and hotel owners          
Disaggregation of Revenue [Line Items]          
Development advance notes 69   $ 69   $ 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 6 3 $ 9 7  
Forgiveness of note receivable          
Disaggregation of Revenue [Line Items]          
Net Revenues $ 2 $ 2 $ 3 $ 3