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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Jan. 23, 2015
Apr. 25, 2014
Inventory Disclosure [Abstract]    
Finished goods $ 1,202us-gaap_InventoryFinishedGoodsNetOfReserves $ 1,196us-gaap_InventoryFinishedGoodsNetOfReserves
Work in process 316us-gaap_InventoryWorkInProcessNetOfReserves 247us-gaap_InventoryWorkInProcessNetOfReserves
Raw materials 357us-gaap_InventoryRawMaterialsNetOfReserves 282us-gaap_InventoryRawMaterialsNetOfReserves
Total $ 1,875us-gaap_InventoryNet $ 1,725us-gaap_InventoryNet