Investments - Components of Net Realized Gains and Losses (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Components of net realized capital gains (losses)
Sales of fixed maturity securities	$ (619)	$ (735)	$ (648)
Change in allowance for credit losses on loans			13
Net realized gains (losses)	(548)	(1,078)	827
Excluding Fortitude Re Funds Withheld Assets
Components of net realized capital gains (losses)
Net realized gains (losses)	(434)	(734)	(207)
Fortitude Re Funds Withheld Assets
Components of net realized capital gains (losses)
Net realized gains (losses)	(114)	(344)	1,034
Excluding modified coinsurance and funds withheld embedded derivative
Components of net realized capital gains (losses)
Sales of fixed maturity securities	(619)	(735)	(648)
Intent to sell	0	0	(66)
Change in allowance for credit losses on fixed maturity securities	(25)	(44)	(72)
Foreign exchange transactions	247	129	256
All other derivatives and hedge accounting	(55)	(173)	156
Sales of alternative investments	(16)	29	15
Other	18	14	37
Net realized gains (losses)	(473)	(805)	(306)
Excluding modified coinsurance and funds withheld embedded derivative \| Loans Receivable
Components of net realized capital gains (losses)
Change in allowance for credit losses on loans	(23)	(25)	16
Excluding modified coinsurance and funds withheld embedded derivative \| Excluding Fortitude Re Funds Withheld Assets
Components of net realized capital gains (losses)
Sales of fixed maturity securities	(583)	(668)	(565)
Intent to sell	0	0	(66)
Change in allowance for credit losses on fixed maturity securities	(25)	(44)	(72)
Foreign exchange transactions	256	124	266
All other derivatives and hedge accounting	(62)	(165)	159
Sales of alternative investments	(16)	29	15
Other	19	18	37
Net realized gains (losses)	(434)	(734)	(207)
Excluding modified coinsurance and funds withheld embedded derivative \| Excluding Fortitude Re Funds Withheld Assets \| Loans Receivable
Components of net realized capital gains (losses)
Change in allowance for credit losses on loans	(23)	(28)	19
Excluding modified coinsurance and funds withheld embedded derivative \| Fortitude Re Funds Withheld Assets
Components of net realized capital gains (losses)
Sales of fixed maturity securities	(36)	(67)	(83)
Intent to sell	0	0
Change in allowance for credit losses on fixed maturity securities	0	0
Foreign exchange transactions	(9)	5	(10)
All other derivatives and hedge accounting	7	(8)	(3)
Sales of alternative investments	0	0
Other	(1)	(4)
Net realized gains (losses)	(39)	(71)	(99)
Excluding modified coinsurance and funds withheld embedded derivative \| Fortitude Re Funds Withheld Assets \| Loans Receivable
Components of net realized capital gains (losses)
Change in allowance for credit losses on loans	0	3	(3)
Fortitude Re funds withheld embedded derivative
Components of net realized capital gains (losses)
Net realized gains (losses)	(75)	(273)	1,133
Fortitude Re funds withheld embedded derivative \| Excluding Fortitude Re Funds Withheld Assets
Components of net realized capital gains (losses)
Net realized gains (losses)	0	0
Fortitude Re funds withheld embedded derivative \| Fortitude Re Funds Withheld Assets
Components of net realized capital gains (losses)
Net realized gains (losses)	$ (75)	$ (273)	$ 1,133

Gain Loss On Sale Of Alternative Investments

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Represents other investment charges not specified in the taxonomy.

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- Definition

Realized Gains (Losses), Change In Intent

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Amount, excluding accrued interest, of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

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- Definition

Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction.

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Amount of realized and unrealized gain (loss) on investment.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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