Goodwill and Intangible Assets-Goodwill by Business Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Goodwill [Roll Forward]
Beginning Balance	$ 18,075		$ 17,904
Foreign exchange translation	(159)		99
Other	4	[1]	(1)	[2]
Ending Balance	17,920		18,002
Investment Management
Goodwill [Roll Forward]
Beginning Balance	9,508		9,373
Foreign exchange translation	(108)		59
Other	4	[1]	(1)	[2]
Ending Balance	9,404		9,431
Investment Services
Goodwill [Roll Forward]
Beginning Balance	8,517		8,491
Foreign exchange translation	(51)		40
Other	0	[1]	(10)	[2]
Ending Balance	8,466		8,521
Other
Goodwill [Roll Forward]
Beginning Balance	50		40
Foreign exchange translation	0		0
Other	0	[1]	10	[2]
Ending Balance	$ 50		$ 50

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

[2] Other changes in goodwill include purchase price adjustments and certain other reclassifications