Restructuring Charges- by Business Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		36 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2014
Streamlining Actions
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	$ (2)	$ 6
Total charges since inception	182
Streamlining Actions | Investment Management
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	0	1
Total charges since inception	23
Streamlining Actions | Investment Services
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	2	(16)
Total charges since inception	85
Streamlining Actions | Other
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	(4)	21
Total charges since inception	74
Operational Efficiency Initiatives 2011
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	(2)	(6)	36
Total charges since inception	141
Operational Efficiency Initiatives 2011 | Investment Management
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	0	1
Total charges since inception	51
Operational Efficiency Initiatives 2011 | Investment Services
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	0	(2)
Total charges since inception	84
Operational Efficiency Initiatives 2011 | Other
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	(2)	(5)
Total charges since inception	$ 6