Restructuring Charges by Business Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended													12 Months Ended	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Mar. 31, 2012 Operational Excellence Initiatives 2011	Dec. 31, 2011 Operational Excellence Initiatives 2011	Mar. 31, 2012 Operational Excellence Initiatives 2011 Investment Management	Dec. 31, 2011 Operational Excellence Initiatives 2011 Investment Management	Mar. 31, 2012 Operational Excellence Initiatives 2011 Investment Services	Dec. 31, 2011 Operational Excellence Initiatives 2011 Investment Services	Mar. 31, 2012 Operational Excellence Initiatives 2011 Other Operating Segment	Dec. 31, 2011 Operational Excellence Initiatives 2011 Other Operating Segment	Mar. 31, 2012 Global Location Strategy 2009	Mar. 31, 2011 Global Location Strategy 2009	Dec. 31, 2009 Global Location Strategy 2009	Mar. 31, 2012 Global Location Strategy 2009 Investment Management	Mar. 31, 2012 Global Location Strategy 2009 Investment Services	Dec. 31, 2011 Global Location Strategy 2009 Investment Services	Mar. 31, 2011 Global Location Strategy 2009 Investment Services	Mar. 31, 2012 Global Location Strategy 2009 Other Operating Segment	Dec. 31, 2011 Global Location Strategy 2009 Other Operating Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (9)	$ 107	$ (6)	$ (2)	$ 107		$ 17	$ (2)	$ 41		$ 49	$ (7)	$ (6)	$ 139	$ (1)	$ (7)	$ (1)	$ (6)	$ 1	$ 1
Total charges since inception				$ 105		$ 17		$ 39		$ 49		$ 152			$ 54	$ 69			$ 29