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 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Schedule Of Trading Securities And Other Trading Assets [Line Items]        
Trading Securities, Change in Unrealized Holding Gain (Loss) $ (88) $ (283) $ (151) $ (254)
Net gains (losses) on derivatives related to trading securities $ 72 $ 278 $ 138 $ 252