Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		$ (71)	$ (160)	$ 54	$ 223
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		(214)	(6)	(268)	(22)
All Other Futures Contracts, Options and equities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		134	(86)	236	39
Convertible securities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	[1]	(1)	1	(2)	1
Total investment and embedded derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		(81)	(91)	(34)	18
GLB
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		(143)	(8)	(108)	311
Futures contracts on equities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	[2]	144	(64)	186	(108)
Other
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		9	3	10	2
Guaranteed Living Benefit And Other Derivative Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		$ 10	$ (69)	$ 88	$ 205

[1] Includes embedded derivatives.

[2] Related to GMDB and GLB book of business.