Restructuring Charges- by Business Segment (Detail) (Operational Efficiency Initiatives 2011, USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended	18 Months Ended	33 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2011	Jun. 30, 2013	Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	$ 15	$ 2	$ 107	$ 5
Total charges since inception					127
Investment Management
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	(2)	(1)
Total charges since inception					46
Investment Services
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	16	4
Total charges since inception					80
Other
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	1	(1)
Total charges since inception					$ 1