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Goodwill and Intangible Assets Estimated Future Amoritzation (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Depreciation and amortization [Member]    
Finite-Lived Intangible Assets [Line Items]    
2019 (remaining) $ 141  
2019   $ 279
2020 250 236
2021 110 97
2022 81 66
2023 51 48
Thereafter 144 137
Total intangible assets 777 863
Franchise fee and base and other management fee revenues [Member]    
Finite-Lived Intangible Assets [Line Items]    
2019 (remaining) 13  
2019   27
2020 26 25
2021 25 24
2022 23 22
2023 23 22
Thereafter 330 304
Total intangible assets $ 440 $ 424