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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 700 $ 726
Finished product 2,150 1,987
Inventories, gross 2,850 2,713
Inventory reserves (108) (121)
Inventories, net $ 2,742 $ 2,592