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Fair Value Measurements - Changes in Level 3 Recurring Fair Value Measurements, Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
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, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period | $ 3,133 | $ 4,055 | $ 3,481 | $ 4,151 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 20 | 21 | 24 | 20 |  |  |  |
Other Comprehensive Income (Loss) | 21 | (22) | 65 | 34 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | 264 | (202) | 138 | (440) |  |  |  |
Gross Transfers In | 52 | 437 | 99 | 552 |  |  |  |
Gross Transfers Out | (33) | (52) | (350) | (67) |  |  |  |
Other | 0 | 44 | 0 | 31 |  |  |  |
Fair Value End of Period | 3,457 | 4,281 | 3,457 | 4,281 |  |  |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 2 | 0 | 7 | (12) |  |  |  |
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period | $ 1 | $ (29) | $ 34 | $ 27 |  |  |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | 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 | Other comprehensive income | Other comprehensive income |  |  |  |
Fair Value Beginning of Year | $ (104) | $ (94) | $ (104) | $ (94) | $ 21 | $ (28) | $ (210) | $ (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) | 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 | $ 2,722 | $ 3,487 | $ 3,010 | $ 3,439 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 15 | 23 | 14 | 32 |  |  |  |
Other Comprehensive Income (Loss) | 21 | (22) | 65 | 34 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | 262 | (162) | 155 | (293) |  |  |  |
Gross Transfers In | 49 | 435 | 56 | 550 |  |  |  |
Gross Transfers Out | (33) | (50) | (264) | (51) |  |  |  |
Other | (21) | 44 | (21) | 44 |  |  |  |
Fair Value End of Period | 3,015 | 3,755 | 3,015 | 3,755 |  |  |  |
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 | 1 | (29) | 34 | 27 |  |  |  |
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 | 4 | 3 | 3 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 0 | 0 | 0 |  |  |  |
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | 0 | 0 | 0 | 1 |  |  |  |
Gross Transfers In | 0 | 0 | 0 | 0 |  |  |  |
Gross Transfers Out | 0 | 0 | 0 | 0 |  |  |  |
Other | 0 | 0 | 0 | 0 |  |  |  |
Fair Value End of Period | 3 | 4 | 3 | 4 |  |  |  |
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 |  |  |  |
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 | 7 | 7 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 0 | 0 | 0 |  |  |  |
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | (1) | 0 | (1) | 0 |  |  |  |
Gross Transfers In | 0 | 0 | 0 | 0 |  |  |  |
Gross Transfers Out | 0 | 0 | 0 | 0 |  |  |  |
Other | 0 | 0 | 0 | 0 |  |  |  |
Fair Value End of Period | 6 | 7 | 6 | 7 |  |  |  |
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 |  |  |  |
Bonds available for sale | Corporate debt |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period | 115 | 383 | 240 | 323 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | 0 | (8) | 1 |  |  |  |
Other Comprehensive Income (Loss) | 1 | (2) | 11 | (2) |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | (26) | (22) | (151) | (60) |  |  |  |
Gross Transfers In | 49 | 36 | 49 | 134 |  |  |  |
Gross Transfers Out | (31) | (36) | (32) | (37) |  |  |  |
Other | 38 | 0 | 38 | 0 |  |  |  |
Fair Value End of Period | 147 | 359 | 147 | 359 |  |  |  |
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 | (6) | (2) | 0 | (1) |  |  |  |
Bonds available for sale | RMBS |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period | 1,656 | 1,766 | 1,894 | 1,792 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 8 | 24 | 15 | 47 |  |  |  |
Other Comprehensive Income (Loss) | 9 | (29) | 42 | (2) |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | (39) | (75) | (96) | (150) |  |  |  |
Gross Transfers In | 0 | 287 | 3 | 287 |  |  |  |
Gross Transfers Out | (1) | (1) | (225) | (2) |  |  |  |
Other | 0 | 44 | 0 | 44 |  |  |  |
Fair Value End of Period | 1,633 | 2,016 | 1,633 | 2,016 |  |  |  |
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 | (2) | (30) | 15 | (2) |  |  |  |
Bonds available for sale | CMBS |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period | 26 | 43 | 26 | 25 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | (4) | 1 | (4) |  |  |  |
Other Comprehensive Income (Loss) | 1 | 6 | 1 | 6 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | (1) | (18) | (5) | (18) |  |  |  |
Gross Transfers In | 0 | 68 | 4 | 85 |  |  |  |
Gross Transfers Out | (1) | (1) | (1) | 0 |  |  |  |
Other | 0 | 0 | 0 | 0 |  |  |  |
Fair Value End of Period | 26 | 94 | 26 | 94 |  |  |  |
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 | 1 |  |  |  |
Bonds available for sale | CLO/ABS |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period | 915 | 1,284 | 840 | 1,289 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 5 | 3 | 6 | (12) |  |  |  |
Other Comprehensive Income (Loss) | 10 | 3 | 11 | 32 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | 329 | (47) | 408 | (66) |  |  |  |
Gross Transfers In | 0 | 44 | 0 | 44 |  |  |  |
Gross Transfers Out | 0 | (12) | (6) | (12) |  |  |  |
Other | (59) | 0 | (59) | 0 |  |  |  |
Fair Value End of Period | 1,200 | 1,275 | 1,200 | 1,275 |  |  |  |
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 | 9 | 3 | 19 | 29 |  |  |  |
Other bond securities |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period | 171 | 243 | 164 | 234 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 2 | 2 | 6 | 1 |  |  |  |
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | (1) | (5) | (6) | 5 |  |  |  |
Gross Transfers In | 2 | 2 | 33 | 2 |  |  |  |
Gross Transfers Out | 0 | (2) | (23) | (2) |  |  |  |
Other | 0 | (2) | 0 | (2) |  |  |  |
Fair Value End of Period | 174 | 238 | 174 | 238 |  |  |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 1 | 1 | 6 | (1) |  |  |  |
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 bond securities | Corporate debt |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period | 1 | 46 | 1 | 45 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 1 | 0 | 1 |  |  |  |
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | 0 | 0 | 0 | 0 |  |  |  |
Gross Transfers In | 0 | 0 | 0 | 0 |  |  |  |
Gross Transfers Out | 0 | 0 | 0 | 0 |  |  |  |
Other | 0 | (3) | 0 | (2) |  |  |  |
Fair Value End of Period | 1 | 44 | 1 | 44 |  |  |  |
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 |  |  |  |
Other bond securities | RMBS |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period | 50 | 53 | 50 | 51 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | 0 | 2 | 0 |  |  |  |
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | (1) | (2) | (2) | 0 |  |  |  |
Gross Transfers In | 0 | 0 | 0 | 0 |  |  |  |
Gross Transfers Out | 0 | (2) | 0 | (2) |  |  |  |
Other | 0 | 0 | 0 | 0 |  |  |  |
Fair Value End of Period | 50 | 49 | 50 | 49 |  |  |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 0 | 0 | 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 | 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 | 120 | 144 | 113 | 138 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 1 | 1 | 4 | 0 |  |  |  |
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | 0 | (3) | (4) | 5 |  |  |  |
Gross Transfers In | 2 | 2 | 33 | 2 |  |  |  |
Gross Transfers Out | 0 | 0 | (23) | 0 |  |  |  |
Other | 0 | 1 | 0 | 0 |  |  |  |
Fair Value End of Period | 123 | 145 | 123 | 145 |  |  |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 1 | 1 | 5 | (1) |  |  |  |
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 |  |  |  |
Equity securities |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period | 35 | 13 | 15 | 14 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 3 | 0 | 4 | 0 |  |  |  |
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | 8 | 0 | 18 | 0 |  |  |  |
Gross Transfers In | 0 | 0 | 9 | 0 |  |  |  |
Gross Transfers Out | 0 | 0 | 0 | (1) |  |  |  |
Other | 0 | 0 | 0 | 0 |  |  |  |
Fair Value End of Period | 46 | 13 | 46 | 13 |  |  |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | 2 | 0 | 2 | 1 |  |  |  |
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 invested assets |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period | 76 | 183 | 163 | 221 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | (4) | 0 | (13) |  |  |  |
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | (5) | (36) | (29) | (39) |  |  |  |
Gross Transfers In | 1 | 0 | 1 | 0 |  |  |  |
Gross Transfers Out | 0 | 0 | (63) | (13) |  |  |  |
Other | 21 | 2 | 21 | (11) |  |  |  |
Fair Value End of Period | 93 | 145 | 93 | 145 |  |  |  |
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period | (1) | (1) | (1) | (12) |  |  |  |
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 assets |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value Beginning of Period | 129 | 129 | 129 | 243 |  |  |  |
Net Realized and Unrealized Gains (Losses) Included in Income | 0 | 0 | 0 | 0 |  |  |  |
Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |  |  |  |
Purchases, Sales, Issuances and Settlements, Net | 0 | 1 | 0 | (113) |  |  |  |
Gross Transfers In | 0 | 0 | 0 | 0 |  |  |  |
Gross Transfers Out | 0 | 0 | 0 | 0 |  |  |  |
Other | 0 | 0 | 0 | 0 |  |  |  |
Fair Value End of Period | 129 | 130 | 129 | 130 |  |  |  |
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 Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis Assets Other Increase (Decrease) + References No definition available. + Details
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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 Indicates line item in statement of income or comprehensive income that includes unrealized gain (loss) from asset measured at fair value using unobservable input (level 3) and still held. + 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/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 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 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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