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Inventories - Inventories, Net of Reserve (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 73us-gaap_InventoryRawMaterialsNetOfReserves $ 84us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 795us-gaap_InventoryWorkInProcessNetOfReserves 885us-gaap_InventoryWorkInProcessNetOfReserves
Finished products 401us-gaap_InventoryFinishedGoodsNetOfReserves 367us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 1,269us-gaap_InventoryNet $ 1,336us-gaap_InventoryNet