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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, 2025

Sep. 30, 2024

Sep. 30, 2025

Sep. 30, 2024

Other derivative instruments

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

$ (9)

$ (2)

$ (14)

$ (7)

Not Designated as Hedging Instrument [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

(153)

23

(62)

(158)

Not Designated as Hedging Instrument [Member] | Foreign currency forward contracts

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

(82)

52

51

(28)

Not Designated as Hedging Instrument [Member] | Options/Futures/Forward contracts on notes and bonds

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

(3)

12

(5)

30

Not Designated as Hedging Instrument [Member] | Convertible securities

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

^[1]

0

2

0

4

Not Designated as Hedging Instrument [Member] | Investment And Embedded Derivative Instruments [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

(85)

66

46

6

Not Designated as Hedging Instrument [Member] | Futures contracts on equities

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

^[2]

(59)

(41)

(94)

(157)

Not Designated as Hedging Instrument [Member] | Other derivative instruments

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

(9)

(2)

(14)

(7)

Not Designated as Hedging Instrument [Member] | Other Derivative Instruments [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

$ (68)

$ (43)

$ (108)

$ (164)

[1]	Includes embedded derivatives.
[2]	Related to MRB book of business.