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Intangible Assets - Amortization Expense (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Years
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Years
Jun. 30, 2020
USD ($)
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense $ 23 $ 18 $ 46 $ 37
The number of succeeding years for which amortization expense is disclosed | Years 4   4  
Amortization expense for the remainder of the Year $ 46   $ 46  
Amortization expense for Year One 90   90  
Amortization expense for Year Two 89   89  
Amortization expense for Year Three 89   89  
Amortization expense for Year Four 89   89  
Amortization expense Thereafter 807   807  
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 5 0 11 1
Amortizable—Other (f)        
Finite-Lived Intangible Assets [Line Items]        
Intangible asset amortization expense $ 1 $ 1 $ 1 $ 2