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Intangible Assets - Amortization Expense (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Years
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Years
Sep. 30, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense $ 19 $ 20 $ 56 $ 58
The number of succeeding years for which amortization expense is disclosed | Years 4   4  
Amortization expense for the remainder of the Year $ 18   $ 18  
Amortization expense for Year One 72   72  
Amortization expense for Year Two 70   70  
Amortization expense for Year Three 70   70  
Amortization expense for Year Four 70   70  
Amortization expense Thereafter 858   858  
Amortizable—Franchise agreements (a)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 17 17 51 51
Amortizable—License agreements (d)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 1 1 1 1
Amortizable—Customer relationships (e)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense 0 0 1 2
Amortizable—Other (g)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense $ 1 $ 2 $ 3 $ 4