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Inventory (Details) (USD $)
In Millions, unless otherwise specified
Dec. 26, 2014
Sep. 26, 2014
Inventory Disclosure [Abstract]    
Purchased materials and manufactured parts $ 172us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves $ 159us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves
Work in process 88us-gaap_InventoryWorkInProcessNetOfReserves 86us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 398us-gaap_InventoryFinishedGoodsNetOfReserves 383us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 658us-gaap_InventoryNet $ 628us-gaap_InventoryNet