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Intangible Assets - Amortization Expense (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
Years
Mar. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense $ 26 $ 26
The number of succeeding years for which amortization expense is disclosed | Years 4  
Amortization expense for the remainder of 2017 $ 73  
Amortization expense for Year Two 97  
Amortization expense for Year Three 96  
Amortization expense for Year Four 94  
Amortization expense for Year Five 92  
Amortization expense Thereafter 1,178  
Amortizable—Franchise agreements (a)    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense 17 17
Amortizable—License agreements (c)    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense 0 0
Amortizable—Customer relationships (d)    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense 6 7
Amortizable—Pendings and listings (f)    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense 1 0
Amortizable—Other (g)    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense $ 2 $ 2