Quarterly report pursuant to Section 13 or 15(d)

Cash and Investments, Trading Assets (Detail)

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Cash and Investments, Trading Assets (Detail) - Debt Securities [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Schedule Of Trading Securities And Other Trading Assets [Line Items]        
Trading Securities, Change in Unrealized Holding Gain (Loss) $ 48 $ (11) $ (85) $ 54
Net gains (losses) on derivatives related to trading securities $ (45) $ 9 $ 81 $ (56)