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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventory, Gross [Abstract]      
Raw materials and supplies $ 760   $ 737
Work in process 157   139
Finished goods 514   509
Total inventories $ 1,431 $ 1,241 $ 1,385