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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Jun. 29, 2014
Dec. 29, 2013
Summary of Inventories    
Raw materials and supplies $ 1,251 $ 1,224
Goods in process 2,136 2,612
Finished goods 4,768 4,042
Total inventories $ 8,155 $ 7,878