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Intangible Assets - Amortization Expense (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
Years
Mar. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense $ 24 $ 25
The number of succeeding years for which amortization expense is disclosed | Years 4  
Amortization expense for the remainder of 2018 $ 73  
Amortization expense for Year Two 95  
Amortization expense for Year Three 93  
Amortization expense for Year Four 92  
Amortization expense for Year Five 91  
Amortization expense Thereafter 994  
Amortizable—Franchise agreements (a)    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense 17 17
Amortizable—Customer relationships (d)    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense 6 6
Amortizable—Pendings and listings (f)    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense 0 1
Amortizable—Other (f)    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense $ 1 $ 1