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Intangible Assets - Amortization Expense (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
Years
Mar. 31, 2020
USD ($)
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense $ 23 $ 19
The number of succeeding years for which amortization expense is disclosed | Years 4  
Amortization expense for the remainder of the Year $ 68  
Amortization expense for Year One 90  
Amortization expense for Year Two 89  
Amortization expense for Year Three 89  
Amortization expense for Year Four 89  
Amortization expense Thereafter 809  
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 1
Amortizable—Other (f)    
Finite-Lived Intangible Assets [Line Items]    
Intangible asset amortization expense $ 0 $ 1