Derivative Financial Instruments (Details 10) (USD $) In Billions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Interest rate	$ 3,014.3	$ 2,782.6
Foreign Exchange	961.6	865.2
Commodities, equities and precious metals	72.1	75.5
Credit derivatives	571.0	657.3
Total	4,619.0	4,380.6
Futures and forwards [Member]
Derivative [Line Items]
Interest rate	271.6	320.3
Swaps [Member]
Derivative [Line Items]
Interest rate	2,580.1	2,325.1
Swaps, futures and forwards [Member]
Derivative [Line Items]
Foreign Exchange	791.2	725.0
Commodities, equities and precious metals	47.2	50.2
Options written [Member]
Derivative [Line Items]
Interest rate	81.4	69.9
Foreign Exchange	42.5	39.7
Commodities, equities and precious metals	7.0	8.2
Options purchased [Member]
Derivative [Line Items]
Interest rate	81.2	67.3
Foreign Exchange	43.9	40.4
Commodities, equities and precious metals	17.9	17.1
Spot [Member]
Derivative [Line Items]
Foreign Exchange	$ 84.0	$ 60.1