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Notional and Fair Value Amounts of Client-related and Trading Derivative Financial Instruments (Detail) (Client Related and Trading, USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Notional Value	$ 252,982.1	$ 244,572.2
Fair Value Asset	3,310.0	3,250.8
Fair Value Liability	3,240.7	3,144.4
Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	248,231.5	239,901.3
Fair Value Asset	3,127.8	3,062.1
Fair Value Liability	3,063.6	2,959.8
Interest Rate Option Contracts
Derivative [Line Items]
Notional Value	104.4	100.5
Fair Value Asset	0.1
Fair Value Liability	0.1
Interest Rate Swap Contracts
Derivative [Line Items]
Notional Value	4,646.2	4,570.4
Fair Value Asset	182.1	188.7
Fair Value Liability	$ 177.0	$ 184.6

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details