Derivative Instruments- Revenue from Foreign Exchange and Other Trading (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Trading Activity, Gains and Losses, Net [Line Items]
Foreign exchange	$ 149	$ 106	$ 136
Other trading revenue	12	33	55
Foreign exchange and other trading revenue	161	139	191
Fixed Income
Trading Activity, Gains and Losses, Net [Line Items]
Other trading revenue	8	25	47
Credit Derivatives/Other
Trading Activity, Gains and Losses, Net [Line Items]
Other trading revenue	$ 4	$ 8	$ 8

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

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The net gain (loss) on trading activities (including both derivative and nonderivative instruments) recognized in the statement of financial performance.

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