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Supplemental Financial Information - Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Disclosure Text Block Supplement [Abstract]    
Materials $ 248us-gaap_InventoryRawMaterialsNetOfReserves $ 226us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 260us-gaap_InventoryWorkInProcessNetOfReserves 258us-gaap_InventoryWorkInProcessNetOfReserves
Finished products 987us-gaap_InventoryFinishedGoodsNetOfReserves 918us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 1,495us-gaap_InventoryNet $ 1,402us-gaap_InventoryNet