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Fair Value Measurements - Changes in Level 3 Recurring Fair Value Measurements, Assets (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | $ 3,481 | $ 4,151 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 4 | (1) |  |
Other Comprehensive Income (Loss) | 44 | 56 |  |
Purchases, Sales, Issuances and Settlements, Net | (126) | (238) |  |
Gross Transfers In | 47 | 115 |  |
Gross Transfers Out | (317) | (15) |  |
Other | 0 | (13) |  |
Fair Value End of Period | 3,133 | 4,055 |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 4 | (13) |  |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | $ 27 | $ 56 |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] | Other comprehensive income | Other comprehensive income |  |
Fair Value Beginning of Year | $ 21 | $ (210) | $ (28) | $ (479)
Net realized gains/(losses) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Realized Investment Gains (Losses) | Realized Investment Gains (Losses) |  |
Bonds available for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | $ 3,010 | $ 3,439 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | (1) | 9 |  |
Other Comprehensive Income (Loss) | 44 | 56 |  |
Purchases, Sales, Issuances and Settlements, Net | (107) | (131) |  |
Gross Transfers In | 7 | 115 |  |
Gross Transfers Out | (231) | (1) |  |
Other | 0 | 0 |  |
Fair Value End of Period | 2,722 | 3,487 |  |
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 | 27 | 56 |  |
Bonds available for sale | Obligations of states, municipalities and political subdivisions |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 3 | 3 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 0 |  |
Other Comprehensive Income (Loss) | 0 | 0 |  |
Purchases, Sales, Issuances and Settlements, Net | 0 | 1 |  |
Gross Transfers In | 0 | 0 |  |
Gross Transfers Out | 0 | 0 |  |
Other | 0 | 0 |  |
Fair Value End of Period | 3 | 4 |  |
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 |  |
Bonds available for sale | Non-U.S. governments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 7 | 7 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 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 | 0 | 0 |  |
Fair Value End of Period | 7 | 7 |  |
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 |  |
Bonds available for sale | Corporate debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 240 | 323 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | (9) | 1 |  |
Other Comprehensive Income (Loss) | 10 | 0 |  |
Purchases, Sales, Issuances and Settlements, Net | (125) | (38) |  |
Gross Transfers In | 0 | 98 |  |
Gross Transfers Out | (1) | (1) |  |
Other | 0 | 0 |  |
Fair Value End of Period | 115 | 383 |  |
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 | 9 | 1 |  |
Bonds available for sale | RMBS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 1,894 | 1,792 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 7 | 23 |  |
Other Comprehensive Income (Loss) | 33 | 27 |  |
Purchases, Sales, Issuances and Settlements, Net | (57) | (75) |  |
Gross Transfers In | 3 | 0 |  |
Gross Transfers Out | (224) | (1) |  |
Other | 0 | 0 |  |
Fair Value End of Period | 1,656 | 1,766 |  |
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 | 17 | 28 |  |
Bonds available for sale | CMBS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 26 | 25 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 0 |  |
Other Comprehensive Income (Loss) | 0 | 0 |  |
Purchases, Sales, Issuances and Settlements, Net | (4) | 0 |  |
Gross Transfers In | 4 | 17 |  |
Gross Transfers Out | 0 | 1 |  |
Other | 0 | 0 |  |
Fair Value End of Period | 26 | 43 |  |
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 |  |
Bonds available for sale | CLO/ABS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 840 | 1,289 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | (15) |  |
Other Comprehensive Income (Loss) | 1 | 29 |  |
Purchases, Sales, Issuances and Settlements, Net | 79 | (19) |  |
Gross Transfers In | 0 | 0 |  |
Gross Transfers Out | (6) | 0 |  |
Other | 0 | 0 |  |
Fair Value End of Period | 915 | 1,284 |  |
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 | 1 | 27 |  |
Other bond securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 164 | 234 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 4 | (1) |  |
Other Comprehensive Income (Loss) | 0 | 0 |  |
Purchases, Sales, Issuances and Settlements, Net | (5) | 10 |  |
Gross Transfers In | 31 | 0 |  |
Gross Transfers Out | (23) | 0 |  |
Other | 0 | 0 |  |
Fair Value End of Period | 171 | 243 |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 4 | (2) |  |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 |  |
Other bond securities | Corporate debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 1 | 45 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 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 | 0 | 1 |  |
Fair Value End of Period | 1 | 46 |  |
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 |  |
Other bond securities | RMBS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 50 | 51 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | 0 |  |
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 | 0 | 0 |  |
Fair Value End of Period | 50 | 53 |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 1 | 0 |  |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 |  |
Other bond securities | CLO/ABS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 113 | 138 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 3 | (1) |  |
Other Comprehensive Income (Loss) | 0 | 0 |  |
Purchases, Sales, Issuances and Settlements, Net | (4) | 8 |  |
Gross Transfers In | 31 | 0 |  |
Gross Transfers Out | (23) | 0 |  |
Other | 0 | (1) |  |
Fair Value End of Period | 120 | 144 |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 3 | (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 securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 15 | 14 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | 0 |  |
Other Comprehensive Income (Loss) | 0 | 0 |  |
Purchases, Sales, Issuances and Settlements, Net | 10 | 0 |  |
Gross Transfers In | 9 | 0 |  |
Gross Transfers Out | 0 | (1) |  |
Other | 0 | 0 |  |
Fair Value End of Period | 35 | 13 |  |
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 |  |
Other invested assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 163 | 221 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | (9) |  |
Other Comprehensive Income (Loss) | 0 | 0 |  |
Purchases, Sales, Issuances and Settlements, Net | (24) | (3) |  |
Gross Transfers In | 0 | 0 |  |
Gross Transfers Out | (63) | (13) |  |
Other | 0 | (13) |  |
Fair Value End of Period | 76 | 183 |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | (11) |  |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | 0 | 0 |  |
Other assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value Beginning of Period | 129 | 243 |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 0 |  |
Other Comprehensive Income (Loss) | 0 | 0 |  |
Purchases, Sales, Issuances and Settlements, Net | 0 | (114) |  |
Gross Transfers In | 0 | 0 |  |
Gross Transfers Out | 0 | 0 |  |
Other | 0 | 0 |  |
Fair Value End of Period | 129 | 129 |  |
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 unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: 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 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -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 income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: 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 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: 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 asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: 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 3: 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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