Quarterly report pursuant to Section 13 or 15(d)

Trading Assets (Detail)

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Trading Assets (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Apr. 02, 2011
Marketable Equity Securities [Member]
Mar. 31, 2012
Marketable Debt Instruments [Member]
Apr. 02, 2011
Marketable Debt Instruments [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]          
Total trading assets $ 4,312 $ 4,591      
Trading Securities, Change in Unrealized Holding Gain (Loss)     144 (20) 61
Net gains (losses) on derivatives and intercompany loans related to trading securities       $ 28 $ (50)