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Intangible Assets - Amortization Expense (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Years
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Years
Jun. 30, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense $ 24 $ 24 $ 48 $ 49
The number of succeeding years for which amortization expense is disclosed | Years 4   4  
Amortization expense for the remainder of 2019 $ 49   $ 49  
Amortization expense for Year Two 95   95  
Amortization expense for Year Three 93   93  
Amortization expense for Year Four 92   92  
Amortization expense for Year Five 91   91  
Amortization expense Thereafter 994   994  
Amortizable—Franchise agreements (a)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 17 17 34 34
Amortizable—Customer relationships (d)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 6 6 12 12
Amortizable—Other (f)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense $ 1 $ 1 $ 2 $ 3