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Derivatives and Hedge Accounting - Derivatives not Designated as Hedging Instruments (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total | $ (75) | $ (49)
Net realized gains (losses) - Excluding Fortitude Re Funds Withheld Assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total | $ (28) | $ (42)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Realized Investment Gains (Losses) | Realized Investment Gains (Losses)
Net Realized Gains (Losses) On Fortitude Re funds Withheld Assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total | $ (47) | $ (7)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Realized Investment Gains (Losses) | Realized Investment Gains (Losses)
Interest rate contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total | $ (1) | $ (2)
Foreign exchange contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total | (33) | (39)
Credit contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total | 0 | 1
Embedded derivatives |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Total | $ (41) | $ (9)

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- 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 + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative. + 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 + Details
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- Definition 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. + References No definition available. + Details
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