Acquisitions (Details)	3 Months Ended	12 Months Ended				12 Months Ended			12 Months Ended
	Dec. 31, 2010 EUR (€)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Jun. 30, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 Pulse Trading, Inc. [Member]	Dec. 31, 2011 Bank Of Ireland's Asset Management [Member] USD ($)	Dec. 31, 2011 Intesa Sanpaolo's Securities Services [Member] USD ($)	Dec. 31, 2011 Complementa Investment Controlling AG And Pulse Trading Inc [Member] USD ($)	Jun. 30, 2010 Mourant International Finance Administration [Member] USD ($)
Business Acquisition [Line Items]
Assessment for taxes, penalties and interest	€ 130,000,000
Goodwill resulting from acquisition							31,000,000	932,000,000	68,000,000	73,000,000
Other intangible assets		2,459,000,000	2,593,000,000		1,810,000,000		27,000,000	848,000,000	67,000,000	59,000,000
Contingent asset		53,000,000	72,000,000
Acquired BIAM assets under management							23,000,000,000			122,000,000,000
Date of acquisition						November 3, 2011			October 3, 2011
Other assets		$ 17,139,000,000	$ 13,841,000,000	$ 564,000,000,000