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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished products $ 1,235 $ 1,083
Work in process 200 177
Raw materials 493 437
Supplies 35 33
Total $ 1,963 $ 1,730