Restructuring Charges - by Business Segment (Detail) - USD ($) $ in Millions	3 Months Ended		60 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2015
Streamlining Actions
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	$ 0	$ (5)
Total charges since inception	200
Streamlining Actions | Investment Management
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	1	0
Total charges since inception	36
Streamlining Actions | Investment Services
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	(1)	(4)
Total charges since inception	84
Streamlining Actions | Other
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	0	(1)
Total charges since inception	80
Operational Efficiency Initiatives 2011
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	(1)	1	$ 27
Total charges since inception	133
Operational Efficiency Initiatives 2011 | Investment Management
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	0	1
Total charges since inception	49
Operational Efficiency Initiatives 2011 | Investment Services
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	0	0
Total charges since inception	82
Operational Efficiency Initiatives 2011 | Other
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	(1)	$ 0
Total charges since inception	$ 2