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Inventories - Inventories at Lower of Cost or Market (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials, components and sub-assemblies $ 127us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves $ 164us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Work in process 97us-gaap_InventoryWorkInProcessNetOfReserves 124us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 64us-gaap_InventoryFinishedGoodsNetOfReserves 78us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 288us-gaap_InventoryNet $ 366us-gaap_InventoryNet