Notional and Fair Value Amounts of Client-related and Trading Derivative Financial Instruments (Detail) (Client Related and Trading, USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Notional Value	$ 265,193.1	$ 248,136.7
Fair Value Asset	1,900.1	2,967.5
Fair Value Liability	1,898.1	2,963.2
Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	260,014.8	243,135.0
Fair Value Asset	1,784.3	2,844.7
Fair Value Liability	1,787.1	2,846.2
Interest Rate Contracts
Derivative [Line Items]
Notional Value	5,178.3	5,001.7
Fair Value Asset	115.8	122.8
Fair Value Liability	$ 111.0	$ 117.0