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Leases-Lessee (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Future minimum annual rentals under noncancelable operating leases      
2019 $ 32    
2020 31    
2021 28    
2022 24    
2023 15    
Thereafter 86    
Total 216    
Operating leases [Abstract]      
Total rent expense $ 73 $ 62 $ 64