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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

Mar. 31, 2025

Mar. 31, 2024

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

$ 28

$ (140)

Foreign currency forward contracts

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

(14)

(52)

Options/Futures/Forward contracts on notes and bonds

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

(9)

6

Convertible securities

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

^[1]

0

3

Investment And Embedded Derivative Instruments [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

(23)

(43)

Futures contracts on equities

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

^[2]

54

(95)

Other derivative instruments

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

(3)

(2)

Other Derivative Instruments [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Gain (Loss) on Derivative

$ 51

$ (97)

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

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E

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