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Cash and Investments, Trading Assets (Detail) (Marketable Debt Instruments [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Marketable Debt Instruments [Member]
       
Schedule Of Trading Securities And Other Trading Assets [Line Items]        
Trading Securities, Change in Unrealized Holding Gain (Loss) $ (283) $ 96 $ (254) $ 43
Net gains (losses) on derivatives related to trading securities $ 278 $ (97) $ 252 $ (40)