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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 726 $ 711
Finished product 1,987 1,975
Inventories, gross 2,713 2,686
Inventory reserves (121) (129)
Inventories, net $ 2,592 $ 2,557