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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	Sep. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Notional Value	$ 216,707.0	$ 244,572.2
Fair Value Asset	2,281.5	3,250.8
Fair Value Liability	2,228.0	3,144.4
Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	211,742.5	239,901.3
Fair Value Asset	2,085.2	3,062.1
Fair Value Liability	2,037.9	2,959.8
Interest Rate Option Contracts
Derivative [Line Items]
Notional Value	32.1	100.5
Interest Rate Swap Contracts
Derivative [Line Items]
Notional Value	4,932.4	4,570.4
Fair Value Asset	196.3	188.7
Fair Value Liability	$ 190.1	$ 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