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Inventories, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 531 $ 483
Work in process 338 299
Finished goods 2,392 2,201
Inventories, net 3,261 2,983
Inventories reserves $ 200 $ 136