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Components of Inventories (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Inventory [Line Items] |  |
Raw materials | $ 711 | $ 722
Finished product | 1,975 | 1,865
Inventories, gross | 2,686 | 2,587
Inventory reserves | (129) | (118)
Inventories, net | $ 2,557 | $ 2,469

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