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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventory, Gross [Abstract]      
Raw materials and supplies $ 871   $ 737
Work in process 155   139
Finished goods 613   509
Total inventories $ 1,639 $ 1,241 $ 1,385