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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Dec. 28, 2014
Dec. 29, 2013
Summary of Inventories    
Raw materials and supplies $ 1,214us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves $ 1,224us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Goods in process 2,461us-gaap_InventoryWorkInProcessNetOfReserves 2,612us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 4,509us-gaap_InventoryFinishedGoodsNetOfReserves 4,042us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventories $ 8,184us-gaap_InventoryNet $ 7,878us-gaap_InventoryNet