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Investments - Components of Net Realized Gains and Losses (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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- Definition 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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