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Intangible Assets - Amortization Expense (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Years
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Years
Jun. 30, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense $ 24 $ 25 $ 49 $ 51
The number of succeeding years for which amortization expense is disclosed | Years 4   4  
Amortization expense for the remainder of 2018 $ 49   $ 49  
Amortization expense for Year Two 97   97  
Amortization expense for Year Three 95   95  
Amortization expense for Year Four 93   93  
Amortization expense for Year Five 92   92  
Amortization expense Thereafter 1,085   1,085  
Amortizable—Franchise agreements (a)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 17 17 34 34
Amortizable—License agreements (c)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 0 0 0 0
Amortizable—Customer relationships (d)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 6 7 12 13
Amortizable—Pendings and listings (f)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 0 0 1 1
Amortizable—Other (g)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense $ 1 $ 1 $ 2 $ 3