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Fair Value Measurements - Changes in Level 3 Recurring Fair Value Measurements, Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative liabilities, net: |  |  |
Fair Value Beginning of Year | $ (28) | $ (479) | $ (512)
Net Realized and Unrealized (Gains) Losses Included in Income | 114 | 311 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | 302 | (278) |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | 0 | 0 |
Other | 35 | 0 |
Fair Value End of Period | (28) | (479) |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | (27) | (96) |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | $ 0 | $ 0 |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Adjusted Revenues | Adjusted Revenues |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] | Other comprehensive income (loss) | Other comprehensive income (loss) |
Net realized gains/(losses) |  |  |
Derivative liabilities, net: |  |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Total net realized gains (losses) | Total net realized gains (losses) |
Derivative liabilities, net |  |  |
Derivative liabilities, net: |  |  |
Fair Value Beginning of Year | $ (453) | $ (583) |
Net Realized and Unrealized (Gains) Losses Included in Income | 41 | 28 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | 377 | 102 |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | 0 | 0 |
Other | 35 | 0 |
Fair Value End of Year | 0 | (453) |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | (1) | 55 |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 |
Net Realized and Unrealized (Gains) Losses Included in Income | 41 | 28 |
Interest rate contracts |  |  |
Derivative liabilities, net: |  |  |
Fair Value Beginning of Year | (406) | (311) |
Net Realized and Unrealized (Gains) Losses Included in Income | 61 | (44) |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | 345 | (51) |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | 0 | 0 |
Other | 0 | 0 |
Fair Value End of Year | 0 | (406) |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 37 |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 |
Foreign exchange contracts |  |  |
Derivative liabilities, net: |  |  |
Fair Value Beginning of Year | 2 | 0 |
Net Realized and Unrealized (Gains) Losses Included in Income | (2) | 2 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | 0 | 0 |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | 0 | 0 |
Other | 0 | 0 |
Fair Value End of Year | 0 | 2 |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | (2) |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 |
Equity contracts |  |  |
Derivative liabilities, net: |  |  |
Fair Value Beginning of Year | (48) | (271) |
Net Realized and Unrealized (Gains) Losses Included in Income | (18) | 72 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | 31 | 151 |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | 0 | 0 |
Other | 35 | 0 |
Fair Value End of Year | 0 | (48) |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 19 |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 |
Credit contracts |  |  |
Derivative liabilities, net: |  |  |
Fair Value Beginning of Year | 0 | 0 |
Net Realized and Unrealized (Gains) Losses Included in Income | 1 | 0 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | 0 | 0 |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | 0 | 0 |
Other | (1) | 0 |
Fair Value End of Year | 0 | 0 |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | (1) | (1) |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 |
Other contracts |  |  |
Derivative liabilities, net: |  |  |
Fair Value Beginning of Year | (1) | (1) |
Net Realized and Unrealized (Gains) Losses Included in Income | (1) | (2) |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | 1 | 2 |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | 0 | 0 |
Other | 1 | 0 |
Fair Value End of Year | 0 | (1) |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 2 |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 |
Fortitude Re funds withheld payable |  |  |
Derivative liabilities, net: |  |  |
Fair Value Beginning of Year | (128) | (148) | (41)
Net Realized and Unrealized (Gains) Losses Included in Income | 75 | 273 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | (55) | (380) |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | 0 | 0 |
Other | 0 | 0 |
Fair Value End of Period | (128) | (148) |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | (26) | (151) |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 |
Other Liabilities |  |  |
Derivative liabilities, net: |  |  |
Fair Value Beginning of Year | 100 | 122 | $ 112
Net Realized and Unrealized (Gains) Losses Included in Income | (2) | 10 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | (20) | 0 |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | 0 | 0 |
Other | 0 | 0 |
Fair Value End of Period | 100 | 122 |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | $ 0 | $ 0 |

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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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