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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, 2013	Dec. 31, 2012
Derivative [Line Items]
Notional Value	$ 239,715.5	$ 218,193.3
Fair Value Asset	2,504.0	1,915.9
Fair Value Liability	2,440.0	1,904.4
Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	234,808.9	213,246.7
Fair Value Asset	2,337.1	1,735.3
Fair Value Liability	2,280.2	1,730.4
Interest Rate Option Contracts
Derivative [Line Items]
Notional Value	23.9	31.4
Interest Rate Swap Contracts
Derivative [Line Items]
Notional Value	4,882.7	4,915.2
Fair Value Asset	166.9	180.6
Fair Value Liability	$ 159.8	$ 174.0

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