Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	$ (63)		$ 42		$ (233)		$ 210
Foreign Exchange Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	19		(9)		15		8
All Other Futures Contracts And Options [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(15)		6		(55)		46
Convertibles and Bonds with Warrants Attached [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(17)	[1]	6	[1]	(13)	[1]	7	[1]
TBAs [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	0		1		0		1
Investment And Embedded Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(13)		4		(53)		62
Guaranteed Living Benefits [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(80)	[2]	134	[2]	(126)	[2]	563	[2]
Single-Stock Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(15)	[3]	(90)	[3]	(103)	[3]	(393)	[3]
Options On Equity Market Indices [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	0	[3]	(5)	[3]	(3)	[3]	(20)	[3]
Guaranteed Living Benefit And Other Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(50)		38		(180)		148
Other Derivatives [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	$ 45		$ (1)		$ 52		$ (2)

[1] (1) Includes embedded derivatives.

[2] (2) Excludes foreign exchange gains (losses) related to GLB

[3] (3) Related to GMDB and GLB blocks of business.