Goodwill and Intangible Assets-Intangible Assets by Business Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Intangible Assets by Major Class [Line Items]
Impairment of intangible assets		$ 8
Intangible Assets [Roll Forward]
Beginning Balance				4,809		5,152
Disposition of Intangible Assets				(8)
Amortization	(81)	(93)	(95)	(260)		(288)
Foreign exchange translation				0		18
Other				(14)	[1]	0	[1]
Ending Balance	4,527		4,882	4,527		4,882
Investment Management
Intangible Assets [Roll Forward]
Beginning Balance				2,228		2,382
Disposition of Intangible Assets				(7)
Amortization				(113)		(144)
Foreign exchange translation				(1)		16
Other				(13)	[1]	0	[1]
Ending Balance	2,094		2,254	2,094		2,254
Investment Services
Intangible Assets [Roll Forward]
Beginning Balance				1,732		1,922
Disposition of Intangible Assets				(1)
Amortization				(147)	[2]	(144)
Foreign exchange translation				1		2
Other				(1)	[1]	(1)	[1]
Ending Balance	1,584		1,779	1,584		1,779
Other
Intangible Assets [Roll Forward]
Beginning Balance				849		848
Disposition of Intangible Assets				0
Amortization				0		0
Foreign exchange translation				0		0
Other				0	[1]	1	[1]
Ending Balance	849		849	849		849
Customer Contracts
Intangible Assets by Major Class [Line Items]
Impairment of intangible assets		$ 8

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

[2] Includes an $8 million intangible asset impairment recorded in the second quarter of 2013.