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Intangible Assets - Amortization Expense (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Years
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Years
Sep. 30, 2015
USD ($)
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense $ 31 $ 33 $ 84 $ 90
The number of succeeding years for which amortization expense is disclosed | Years 4   4  
Amortization expense for the remainder of 2016 $ 27   $ 27  
Amortization expense for the next twelve months 102   102  
Amortization expense for Year Two 97   97  
Amortization expense for Year Three 96   96  
Amortization expense for Year Four 94   94  
Amortization expense Thereafter 1,270   1,270  
Amortizable—Franchise agreements (a)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 16 17 50 50
Amortizable—License agreements (c)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 0 0 1 1
Amortizable—Customer relationships (d)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 7 7 20 21
Amortizable—Pendings and listings (f)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 7 8 9 14
Amortizable—Other (g)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense $ 1 $ 1 $ 4 $ 4