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Intangible Assets Amortization Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets $ 77 $ 93 $ 97
Expected amortization expense for 2021 87    
Expected amortization expense for 2022 86    
Expected amortization expense for 2023 86    
Expected amortization expense for 2024 85    
Expected amortization expense for 2025 85    
Expected amortization expense thereafter 827    
Amortizable—Franchise agreements      
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets 67 67 67
Amortizable—License agreements      
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets 1 1 1
Amortizable—Customer relationships      
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets 5 19 24
Amortizable—Other      
Schedule of Finite-Lived Intangible Assets, Amortization Expense [Line Items]      
Amortization of Intangible Assets $ 4 $ 6 $ 5