Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		$ 48	$ (344)	$ (442)	$ (272)
Foreign currency forward contracts
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		(10)	15	(30)	30
All Other Futures Contracts And Options [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		8	(23)	(63)	(10)
Convertibles and Bonds with Warrants Attached [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative	[1]	3	(14)	8	(14)
Investment And Embedded Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		1	(22)	(85)	6
Guaranteed Living Benefits [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative	[2]	89	(396)	(270)	(337)
Single-Stock Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative	[3]	(45)	84	(88)	71
Options On Equity Market Indices [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative	[3]	0	(1)	0	(2)
Guaranteed Living Benefit And Other Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		47	(322)	(357)	(278)
Other Derivatives [Member]
Commitments Contingencies And Guarantees [Line Items]
Gain (Loss) on Derivative		$ 3	$ (9)	$ 1	$ (10)

[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.