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Fair Value Measurements - Changes in Level 3 Recurring Fair Value Measurements, Assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair Value Beginning of Period | $ 4,151 | $ 5,062 |
Net Realized and Unrealized Gains (Losses) Included in Income | 6 | 48 |
Other Comprehensive Income (Loss) | 96 | 73 |
Purchases, Sales, Issuances and Settlements, Net | (926) | (790) |
Gross Transfers In | 705 | 329 |
Gross Transfers Out | (601) | (599) |
Other | 50 | 28 |
Fair Value End of Period | 3,481 | 4,151 |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | (9) | (31) |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | $ (16) | $ (29) |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Adjusted Revenues | Adjusted 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 (loss) | Other comprehensive income (loss) |
Fair Value Beginning of Year | $ (28) | $ (479) | $ (512)
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] | Total net realized gains (losses) | Total net realized gains (losses) |
Bonds available for sale |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair Value Beginning of Period | $ 3,439 | $ 4,475 |
Net Realized and Unrealized Gains (Losses) Included in Income | 19 | 35 |
Other Comprehensive Income (Loss) | 96 | 73 |
Purchases, Sales, Issuances and Settlements, Net | (782) | (885) |
Gross Transfers In | 691 | 308 |
Gross Transfers Out | (495) | (583) |
Other | 42 | 16 |
Fair Value End of Period | 3,010 | 3,439 |
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 | (16) | (29) |
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 | 20 |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | (1) |
Other Comprehensive Income (Loss) | 0 | 1 |
Purchases, Sales, Issuances and Settlements, Net | 0 | (16) |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | 0 | (1) |
Other | 0 | 0 |
Fair Value End of Period | 3 | 3 |
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 | (5) | 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 | 2 |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 0 |
Other Comprehensive Income (Loss) | 0 | 1 |
Purchases, Sales, Issuances and Settlements, Net | 0 | (5) |
Gross Transfers In | 0 | 11 |
Gross Transfers Out | 0 | (2) |
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 | 1 |
Bonds available for sale | Corporate debt |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair Value Beginning of Period | 323 | 879 |
Net Realized and Unrealized Gains (Losses) Included in Income | (1) | (8) |
Other Comprehensive Income (Loss) | (3) | 11 |
Purchases, Sales, Issuances and Settlements, Net | (71) | (537) |
Gross Transfers In | 232 | 236 |
Gross Transfers Out | (245) | (258) |
Other | 5 | 0 |
Fair Value End of Period | 240 | 323 |
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 | (6) | (5) |
Bonds available for sale | RMBS |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair Value Beginning of Period | 1,792 | 1,884 |
Net Realized and Unrealized Gains (Losses) Included in Income | 53 | 114 |
Other Comprehensive Income (Loss) | 32 | (10) |
Purchases, Sales, Issuances and Settlements, Net | (238) | (142) |
Gross Transfers In | 308 | 0 |
Gross Transfers Out | (89) | (54) |
Other | 36 | 0 |
Fair Value End of Period | 1,894 | 1,792 |
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 | (43) | (17) |
Bonds available for sale | CMBS |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair Value Beginning of Period | 25 | 207 |
Net Realized and Unrealized Gains (Losses) Included in Income | (11) | (31) |
Other Comprehensive Income (Loss) | 13 | 4 |
Purchases, Sales, Issuances and Settlements, Net | (32) | (6) |
Gross Transfers In | 108 | 44 |
Gross Transfers Out | (78) | (193) |
Other | 1 | 0 |
Fair Value End of Period | 26 | 25 |
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 | (11) |
Bonds available for sale | CLO/ABS |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair Value Beginning of Period | 1,289 | 1,483 |
Net Realized and Unrealized Gains (Losses) Included in Income | (22) | (39) |
Other Comprehensive Income (Loss) | 54 | 66 |
Purchases, Sales, Issuances and Settlements, Net | (441) | (179) |
Gross Transfers In | 43 | 17 |
Gross Transfers Out | (83) | (75) |
Other | 0 | 16 |
Fair Value End of Period | 840 | 1,289 |
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 | 37 | 3 |
Other bond securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair Value Beginning of Period | 234 | 223 |
Net Realized and Unrealized Gains (Losses) Included in Income | 2 | 9 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | 1 | (8) |
Gross Transfers In | 3 | 1 |
Gross Transfers Out | (80) | (3) |
Other | 4 | 12 |
Fair Value End of Period | 164 | 234 |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 1 | (31) |
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 | 45 | 0 |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 1 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | 0 | 44 |
Gross Transfers In | 1 | 0 |
Gross Transfers Out | (45) | 0 |
Other | 0 | 0 |
Fair Value End of Period | 1 | 45 |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 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 bond securities | RMBS |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair Value Beginning of Period | 51 | 65 |
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | 4 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | (3) | (18) |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | (3) | 0 |
Other | 4 | 0 |
Fair Value End of Period | 50 | 51 |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 2 | (7) |
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 | 138 | 158 |
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | 4 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | 4 | (34) |
Gross Transfers In | 2 | 1 |
Gross Transfers Out | (32) | (3) |
Other | 0 | 12 |
Fair Value End of Period | 113 | 138 |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | (1) | (25) |
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 | 14 | 13 |
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | 1 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | 4 | 3 |
Gross Transfers In | 11 | 10 |
Gross Transfers Out | (13) | (13) |
Other | (2) | 0 |
Fair Value End of Period | 15 | 14 |
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 invested assets |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair Value Beginning of Period | 221 | 244 |
Net Realized and Unrealized Gains (Losses) Included in Income | (16) | 3 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | (35) | (36) |
Gross Transfers In | 0 | 10 |
Gross Transfers Out | (13) | 0 |
Other | 6 | 0 |
Fair Value End of Period | 163 | 221 |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | (11) | (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 assets |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair Value Beginning of Period | 243 | 107 |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 0 |
Other Comprehensive Income (Loss) | 0 | 0 |
Purchases, Sales, Issuances and Settlements, Net | (114) | 136 |
Gross Transfers In | 0 | 0 |
Gross Transfers Out | 0 | 0 |
Other | 0 | 0 |
Fair Value End of Period | 129 | 243 |
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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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + 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)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + 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)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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