Contribution of Segments to Overall Profitability (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended						6 Months Ended
	Jun. 30, 2012		Mar. 31, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Segment Reporting Information [Line Items]
Net (income) loss attributable to noncontrolling interests	$ (30)		$ (12)		$ (22)		$ (42)		$ (67)
Total fee and other revenue	2,854	[1]	2,870	[2]	3,098	[3]	5,724	[4]	6,002	[5]
Investment Management Funds
Segment Reporting Information [Line Items]
Income of consolidated investment management funds	57		43		63		100		173
Net (income) loss attributable to noncontrolling interests	(29)		(11)		(21)		(40)		(65)
Total fee and other revenue	$ 28		$ 32		$ 42		$ 60		$ 108

[1] Total fee and other revenue includes income from consolidated investment management funds of $57 million, net of noncontrolling interests of $29 million, for a net impact of $28 million. Income before taxes includes noncontrolling interests of $29 million.

[2] 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.

[3] Total fee and other revenue includes income from consolidated investment management funds of $63 million, net of noncontrolling interests of $21 million, for a net impact of $42 million. Income before taxes includes noncontrolling interests of $21 million.

[4] Total fee and other revenue includes income from consolidated investment management funds of $100 million, net of noncontrolling interests of $40 million, for a net impact of $60 million. Income before taxes includes noncontrolling interests of $40 million.

[5] Total fee and other revenue includes income from consolidated investment management funds of $173 million, net of noncontrolling interests of $65 million, for a net impact of $108 million. Income before taxes includes noncontrolling interests of $65 million.