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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Inventory Disclosure [Abstract]    
Finished goods $ 142us-gaap_InventoryFinishedGoodsNetOfReserves $ 146us-gaap_InventoryFinishedGoodsNetOfReserves
Work in process 30us-gaap_InventoryWorkInProcessNetOfReserves 36us-gaap_InventoryWorkInProcessNetOfReserves
Raw materials, parts and supplies 193us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves 197us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Total $ 365us-gaap_InventoryNet $ 379us-gaap_InventoryNet