Annual report pursuant to Section 13 and 15(d)

Intangible Assets (Amortization Expense of Amortizable Intangible Assets) (Details)

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Intangible Assets (Amortization Expense of Amortizable Intangible Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ 38 $ 31 $ 20
2019 37    
2020 37    
2021 35    
2022 35    
2023 34    
Franchise agreements      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense 27 22 16
Management agreements      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense 10 7 3
Trademarks, net      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense 0 1 1
Other      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ 1 $ 1 $ 0