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Fair Value Measurements - Changes in Level 3 Recurring Fair Value Measurements, Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Year | $ (104) | $ (94) | $ (104) | $ (94) | $ 21 | $ (28) | $ (210) | $ (479)
Net Realized and Unrealized (Gains) Losses Included in Income | (5) | 8 | 36 | 39 |  |  |  |
Other Comprehensive (Income) Loss | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | (120) | 108 | (112) | 346 |  |  |  |
Gross Transfers In | 0 | 0 | 0 | 0 |  |  |  |
Gross Transfers Out | 0 | 0 | 0 | 0 |  |  |  |
Other | 0 | 0 | 0 | 0 |  |  |  |
Fair Value End of Period | (104) | (94) | (104) | (94) |  |  |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | (32) | 36 | (34) | 55 |  |  |  |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues | 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 | Other comprehensive income | Other comprehensive income | Other comprehensive income |  |  |  |
Net realized gains/(losses) |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Realized Investment Gains (Losses) | Realized Investment Gains (Losses) | Realized Investment Gains (Losses) | Realized Investment Gains (Losses) |  |  |  |
Derivative liabilities, net |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period |  | $ (183) |  | $ (453) |  |  |  |
Net Realized and Unrealized (Gains) Losses Included in Income |  | (12) |  | 40 |  |  |  |
Other Comprehensive (Income) Loss |  | 0 |  | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net |  | 156 |  | 374 |  |  |  |
Gross Transfers In |  | 0 |  | 0 |  |  |  |
Gross Transfers Out |  | 0 |  | 0 |  |  |  |
Other |  | 0 |  | 0 |  |  |  |
Fair Value End of Period |  | (39) |  | (39) |  |  |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period |  | 3 |  | 8 |  |  |  |
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 |  | (12) |  | 40 |  |  |  |
Fortitude Re funds withheld payable |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Year | $ (185) | (154) | $ (185) | (154) | (79) | (128) | (119) | (148)
Net Realized and Unrealized (Gains) Losses Included in Income | 14 | (8) | 55 | 1 |  |  |  |
Other Comprehensive (Income) Loss | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | (120) | (27) | (112) | (7) |  |  |  |
Gross Transfers In | 0 | 0 | 0 | 0 |  |  |  |
Gross Transfers Out | 0 | 0 | 0 | 0 |  |  |  |
Other | 0 | 0 | 0 | 0 |  |  |  |
Fair Value End of Period | (185) | (154) | (185) | (154) |  |  |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | (32) | 33 | (34) | 47 |  |  |  |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 | 0 | 0 |  |  |  |
Other Liabilities |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Year | 81 | 99 | 81 | 99 | $ 100 | $ 100 | $ 92 | $ 122
Net Realized and Unrealized (Gains) Losses Included in Income | (19) | 28 | (19) | (2) |  |  |  |
Other Comprehensive (Income) Loss | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | 0 | (21) | 0 | (21) |  |  |  |
Gross Transfers In | 0 | 0 | 0 | 0 |  |  |  |
Gross Transfers Out | 0 | 0 | 0 | 0 |  |  |  |
Other | 0 | 0 | 0 | 0 |  |  |  |
Fair Value End of Period | 81 | 99 | 81 | 99 |  |  |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 | 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 | $ 0 | $ 0 |  |  |  |

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + 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)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3). + 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)(1a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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