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Leases - Future Minimum Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Leases [Abstract]    
Rent expense $ 111 $ 81
2019 120  
2020 100  
2021 86  
2022 68  
2023 56  
Beyond $ 53