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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw Materials $ 708 $ 466
Work in Process 505 328
Finished Goods 1,758 1,419
Inventories 2,971 2,213
LIFO Method Inventories [Abstract]    
Value of inventories maintained using the LIFO method 219 207
Excess of estimated replacement cost over stated LIFO value $ 31 $ 28