Intangible Assets by Business Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Mar. 31, 2012 Investment Management	Mar. 31, 2011 Investment Management	Mar. 31, 2012 Investment Services		Mar. 31, 2011 Investment Services	Mar. 31, 2012 Other Operating Segment		Mar. 31, 2011 Other Operating Segment	Dec. 31, 2010 Other Operating Segment
Intangible Assets by Major Class [Line Items]
Beginning Balance	$ 5,152		$ 5,696	$ 2,382	$ 2,592	$ 1,922		$ 2,254	$ 848		$ 850	$ 850
Acquisitions			12					12
Amortization	(96)	(106)	(108)	(48)	(55)	(48)		(53)
Foreign exchange translation	16		20	13	13	3		7
Impairment			(3)					(3)
Other						(2)	[1]		2	[1]
Ending Balance	$ 5,072	$ 5,152	$ 5,617	$ 2,347	$ 2,550	$ 1,875		$ 2,217	$ 850		$ 850	$ 850

[1] Other changes in intangible assets include purchase price adjustments and certain other reclassifications.