Lines of Businesses- Contribution of Segments to Overall Profitability (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012
Segment Reporting Information [Line Items]
Net (income) attributable to noncontrolling interests	$ (16)		$ (11)		$ (12)
Fee and other revenue	2,878	[1]	2,881	[2]	2,870	[3]
Investment Management Funds
Segment Reporting Information [Line Items]
Income of consolidated investment management funds	50		42		43
Net (income) attributable to noncontrolling interests	(16)		(11)		(11)
Fee and other revenue	$ 34		$ 31		$ 32

[1] Total fee and other revenue includes income from consolidated investment management funds of $50 million, net of noncontrolling interests of $16 million, for a net impact of $34 million. Income before taxes includes noncontrolling interests of $16 million.

[2] Total fee and other revenue includes income from consolidated investment management funds of $42 million, net of noncontrolling interests of $11 million, for a net impact of $31 million. Income before taxes includes noncontrolling interests of $11 million.

[3] 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.