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Inventories - Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 1,396 $ 1,304
Raw materials and work in process 4,654 4,222
Supplies 175 155
Total (approximates current cost) 6,225 5,681
Increase to LIFO costs 258 302
Total current and noncurrent inventories 6,483 5,983
Recognized as:    
Inventories 5,407 4,866
Other Assets $ 1,076 $ 1,117