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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 743 $ 711
Finished product 2,227 1,975
Inventories, gross 2,970 2,686
Inventory reserves (128) (129)
Inventories, net $ 2,842 $ 2,557