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Operating Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leases      
Rent expense attributable to warehouse, office buildings and equipment operating leases $ 84 $ 80 $ 72
Minimum future rentals under operating leases      
2018 73    
2019 55    
2020 40    
2021 29    
2022 24    
2023 and thereafter $ 37