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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases      
Rental expense $ 60 $ 51 $ 53
Minimum lease payments due on leases      
2019 53    
2020 44    
2021 40    
2022 27    
2023 22    
Balance thereafter $ 27