Contribution of Segments to Overall Profitability (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011
Segment Reporting Information [Line Items]
Net (income) loss attributable to noncontrolling interests	$ (12)		$ 27		$ (45)
Total fee and other revenue	2,870	[1]	2,788	[2]	2,904	[3]
Investment Management Funds
Segment Reporting Information [Line Items]
Income of consolidated investment management funds	43		(5)		110
Net (income) loss attributable to noncontrolling interests	(11)		28		(44)
Total fee and other revenue	$ 32		$ 23		$ 66

[1] Total fee and other revenue includes income from consolidated investment management funds of $43 million, net of noncontrolling interests of $11 million, for a net impact of $32 million. Income before taxes includes noncontrolling interests of $11 million.

[2] Total fee and other revenue includes a loss from consolidated investment management funds of $5 million, net of loss attributable to noncontrolling interests of $28 million, for a net impact of $23 million. Income before taxes includes a loss attributable to noncontrolling interests of $28 million.

[3] Total fee and other revenue includes income from consolidated investment management funds of $110 million, net of noncontrolling interests of $44 million, for a net impact of $66 million. Income before taxes includes noncontrolling interests of $44 million.