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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 2,325 $ 2,102
Work-in-process 1,850 1,719
Finished goods 4,698 4,576
Supplies 209 217
Total inventories $ 9,082 $ 8,614