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Investments (Tables) | 6 Months Ended
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Jun. 30, 2025
Investments [Abstract] |
Schedule of Portfolio Composition |
Portfolio composition
($ in millions) |  | June 30, 2025 |  | December 31, 2024
Fixed income securities, at fair value |  | $ | 54,435 |  |  | $ | 52,747 |
Equity securities, at fair value |  | 2,397 |  |  | 4,463 |
Mortgage loans, net |  | 807 |  |  | 784 |
Limited partnership interests |  | 9,194 |  |  | 9,255 |
Short-term investments, at fair value |  | 9,640 |  |  | 4,537 |
Other investments, net |  | 964 |  |  | 824 |
Total |  | $ | 77,437 |  |  | $ | 72,610 |
Schedule of Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value for Fixed Income Securities |
Amortized cost, gross unrealized gains (losses) and fair value for fixed income securities
($ in millions) |  | Amortized cost, net |  | Gross unrealized |  | Fair value
|  | Gains |  | Losses |
June 30, 2025 |  |  |  |  |  |  |  |
U.S. government and agencies |  | $ | 15,640 |  |  | $ | 86 |  |  | $ | (14) |  |  | $ | 15,712 |
Municipal |  | 7,451 |  |  | 29 |  |  | (194) |  |  | 7,286 |
Corporate |  | 27,849 |  |  | 470 |  |  | (357) |  |  | 27,962 |
Foreign government |  | 1,385 |  |  | 18 |  |  | (12) |  |  | 1,391 |
Asset-backed securities (“ABS”) |  | 973 |  |  | 14 |  |  | (4) |  |  | 983 |
Mortgage-backed securities (“MBS”) |  | 1,085 |  |  | 16 |  |  | — |  |  | 1,101 |
Total fixed income securities |  | $ | 54,383 |  |  | $ | 633 |  |  | $ | (581) |  |  | $ | 54,435 |
December 31, 2024 |  |  |  |  |  |  |  |
U.S. government and agencies |  | $ | 11,423 |  |  | $ | 15 |  |  | $ | (330) |  |  | $ | 11,108 |
Municipal |  | 8,985 |  |  | 33 |  |  | (176) |  |  | 8,842 |
Corporate |  | 30,630 |  |  | 272 |  |  | (710) |  |  | 30,192 |
Foreign government |  | 1,352 |  |  | 22 |  |  | (10) |  |  | 1,364 |
ABS |  | 1,130 |  |  | 19 |  |  | (4) |  |  | 1,145 |
MBS |  | 96 |  |  | — |  |  | — |  |  | 96 |
Total fixed income securities |  | $ | 53,616 |  |  | $ | 361 |  |  | $ | (1,230) |  |  | $ | 52,747 |
Schedule of Maturities for Fixed Income Securities |
Scheduled maturities for fixed income securities
($ in millions) |  | June 30, 2025 |  | December 31, 2024 |
| Amortized cost, net |  | Fair value |  | Amortized cost, net |  | Fair value |
Due in one year or less |  | $ | 1,639 |  |  | $ | 1,625 |  |  | $ | 1,544 |  |  | $ | 1,531 |  |
Due after one year through five years |  | 31,226 |  |  | 31,300 |  |  | 22,889 |  |  | 22,595 |  |
Due after five years through ten years |  | 13,052 |  |  | 13,164 |  |  | 17,431 |  |  | 17,130 |  |
Due after ten years |  | 6,408 |  |  | 6,262 |  |  | 10,526 |  |  | 10,250 |  |
|  | 52,325 |  |  | 52,351 |  |  | 52,390 |  |  | 51,506 |  |
ABS and MBS |  | 2,058 |  |  | 2,084 |  |  | 1,226 |  |  | 1,241 |  |
Total |  | $ | 54,383 |  |  | $ | 54,435 |  |  | $ | 53,616 |  |  | $ | 52,747 |  |
Schedule of Net Investment Income |
Net investment income
($ in millions) |  | Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Fixed income securities |  | $ | 602 |  |  | $ | 571 |  |  | $ | 1,210 |  |  | $ | 1,097 |
Equity securities |  | 17 |  |  | 18 |  |  | 37 |  |  | 33 |
Mortgage loans |  | 9 |  |  | 9 |  |  | 19 |  |  | 18 |
Limited partnership interests |  | 74 |  |  | 103 |  |  | 268 |  |  | 302 |
Short-term investments |  | 97 |  |  | 62 |  |  | 169 |  |  | 129 |
Other investments |  | 24 |  |  | 25 |  |  | 45 |  |  | 46 |
Investment income, before expense |  | 823 |  |  | 788 |  |  | 1,748 |  |  | 1,625 |
Investment expense |  | (69) |  |  | (76) |  |  | (140) |  |  | (149) |
Net investment income |  | $ | 754 |  |  | $ | 712 |  |  | $ | 1,608 |  |  | $ | 1,476 |
Schedule of Net Gains (Losses) on Investments and Derivatives by Asset Type |
Net gains (losses) on investments and derivatives by type
($ in millions) |  | Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Fixed income securities |  | $ | (250) |  |  | $ | (96) |  |  | $ | (378) |  |  | $ | (197) |
Equity securities |  | 164 |  |  | 14 |  |  | 52 |  |  | 76 |
Mortgage loans |  | — |  |  | 1 |  |  | — |  |  | 1 |
Limited partnership interests |  | 13 |  |  | (13) |  |  | 8 |  |  | (5) |
Derivatives |  | (65) |  |  | (15) |  |  | (84) |  |  | (23) |
Other investments |  | (6) |  |  | 6 |  |  | (24) |  |  | 4 |
Other (1) |  | — |  |  | — |  |  | (67) |  |  | (123) |
Net gains (losses) on investments and derivatives |  | $ | (144) |  |  | $ | (103) |  |  | $ | (493) |  |  | $ | (267) |
(1)2025 is related to losses recorded for variable interests in Adirondack Insurance Exchange (“Adirondack”) and New Jersey Skylands Insurance Association (“Skylands”) (together “Reciprocal Exchanges”). 2024 is related to losses for the carrying value of the surplus notes issued by the Reciprocal Exchanges. See Note 8 for further detail.
Schedule of Net Gains (Losses) on Investments and Derivatives by Transaction Type |
Net gains (losses) on investments and derivatives by transaction type
($ in millions) |  | Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Sales |  | $ | (245) |  |  | $ | (90) |  |  | $ | (382) |  |  | $ | (201) |
Credit losses |  | (4) |  |  | (16) |  |  | (80) |  |  | (131) |
Valuation change of equity investments (1) |  | 170 |  |  | 18 |  |  | 53 |  |  | 88 |
Valuation change and settlements of derivatives |  | (65) |  |  | (15) |  |  | (84) |  |  | (23) |
Net gains (losses) on investments and derivatives |  | $ | (144) |  |  | $ | (103) |  |  | $ | (493) |  |  | $ | (267) |
(1)Includes valuation change of equity securities and certain limited partnership interests where the underlying assets are predominately public equity securities.
Schedule of Gross Realized Gains (Losses) on Sales of Fixed Income Securities |
Gross realized gains (losses) on sales of fixed income securities
($ in millions) |  | Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Gross realized gains |  | $ | 116 |  |  | $ | 33 |  |  | $ | 187 |  |  | $ | 74 |
Gross realized losses |  | (367) |  |  | (124) |  |  | (565) |  |  | (270) |
Schedule of Net Appreciation (Decline) Recognized in Net Income |
Net appreciation (decline) recognized in net income for assets that are still held
($ in millions) |  | Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Equity securities |  | $ | 129 |  |  | $ | 18 |  |  | $ | 125 |  |  | $ | 78 |
Limited partnership interests carried at fair value |  | (12) |  |  | 17 |  |  | (29) |  |  | 47 |
Total |  | $ | 117 |  |  | $ | 35 |  |  | $ | 96 |  |  | $ | 125 |
Schedule of Credit Losses Recognized in Net Income |
Credit losses recognized in net income
($ in millions) |  | Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Assets |  |  |  |  |  |  |  |
Fixed income securities: |  |  |  |  |  |  |  |
Corporate |  | $ | 1 |  |  | $ | (5) |  |  | $ | — |  |  | $ | (1) |
Total fixed income securities |  | 1 |  |  | (5) |  |  | — |  |  | (1) |
Mortgage loans |  | — |  |  | 1 |  |  | — |  |  | 1 |
Limited partnership interests |  | (4) |  |  | (16) |  |  | (4) |  |  | (16) |
Other investments |  |  |  |  |  |  |  |
Bank loans |  | (1) |  |  | 2 |  |  | (9) |  |  | 5 |
Real estate |  | — |  |  | 2 |  |  | — |  |  | 2 |
Other assets |  | — |  |  | — |  |  | (52) |  |  | (123) |
Commitments to fund line of credit, commercial mortgage loans and bank loans |  | — |  |  | — |  |  | (15) |  |  | 1 |
Total |  | $ | (4) |  |  | $ | (16) |  |  | $ | (80) |  |  | $ | (131) |
Schedule of Unrealized Net Capital Gains and Losses Included in AOCI |
Unrealized net capital gains and losses included in accumulated other comprehensive income (“AOCI”)
($ in millions) |  | Fair value |  | Gross unrealized |  | Unrealized net gains (losses)
June 30, 2025 |  |  | Gains |  | Losses |
Fixed income securities |  | $ | 54,435 |  |  | $ | 633 |  |  | $ | (581) |  |  | $ | 52 |
Short-term investments |  | 9,640 |  |  | — |  |  | (2) |  |  | (2) |
Derivative instruments |  | — |  |  | — |  |  | (2) |  |  | (2) |
Investments classified as held for sale |  |  |  |  |  |  |  | 1 |
Unrealized net capital gains and losses, pre-tax |  |  |  |  |  |  |  | 49 |
Reclassification of noncontrolling interest |  |  |  |  |  |  |  | — |
Deferred income taxes |  |  |  |  |  |  |  | (13) |
Unrealized net capital gains and losses, after-tax |  |  |  |  |  |  |  | $ | 36 |
December 31, 2024 |  |  |  |  |  |  |  |
Fixed income securities |  | $ | 52,747 |  |  | $ | 361 |  |  | $ | (1,230) |  |  | $ | (869) |
Short-term investments |  | 4,537 |  |  | — |  |  | (2) |  |  | (2) |
Derivative instruments |  | — |  |  | — |  |  | (2) |  |  | (2) |
Investments classified as held for sale |  |  |  |  |  |  |  | (110) |
Unrealized net capital gains and losses, pre-tax |  |  |  |  |  |  |  | (983) |
Reclassification of noncontrolling interest |  |  |  |  |  |  |  | 3 |
Deferred income taxes |  |  |  |  |  |  |  | 209 |
Unrealized net capital gains and losses, after-tax |  |  |  |  |  |  |  | $ | (771) |
Schedule of Change in Unrealized Net Capital Gains (Losses) |
Change in unrealized net capital gains (losses) |  |  |  |  |  |  |  |  |  |
($ in millions) |  | Six months ended June 30, 2025 |  |  |  |  |  |  |  |  |  |
Fixed income securities |  | $ | 921 |  |  |  |  |  |  |  |  |  |  |
Short-term investments |  | — |  |  |  |  |  |  |  |  |  |  |
Derivative instruments |  | — |  |  |  |  |  |  |  |  |  |  |
Investments classified as held for sale (1) |  | 111 |  |  |  |  |  |  |  |  |  |  |
Total |  | 1,032 |  |  |  |  |  |  |  |  |  |  |
Reclassification of noncontrolling interest |  | (3) |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  | (222) |  |  |  |  |  |  |  |  |  |  |
Change in unrealized net capital gains and losses, after-tax |  | $ | 807 |  |  |  |  |  |  |  |  |  |  |
(1)Primarily unrealized net capital gains and losses for investments disposed of in the EVB business sale.
Schedule of Carrying Value for Limited Partnership Interests |
Carrying value for limited partnership interests
($ in millions) |  | June 30, 2025 |  | December 31, 2024
Private equity |  | $ | 7,578 |  |  | $ | 7,734 |
Real estate |  | 1,405 |  |  | 1,236 |
Other (1) |  | 211 |  |  | 285 |
Total |  | $ | 9,194 |  |  | $ | 9,255 |
(1)Other consists of certain limited partnership interests where the underlying assets are predominately public equity and debt securities.
Schedule of Other investments by Asset Type |
Other investments by asset type
($ in millions) |  | June 30, 2025 |  | December 31, 2024
Bank loans, net |  | $ | 335 |  |  | $ | 201 |
Real estate |  | 628 |  |  | 620 |
Other |  | 1 |  |  | 3 |
Total |  | $ | 964 |  |  | $ | 824 |
Schedule of Rollforward of Credit Loss Allowance for Fixed Income Securities, Mortgage Loans and Bank Loans |
Rollforward of credit loss allowance for fixed income securities
|  | Three months ended June 30, |  | Six months ended June 30,
($ in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Beginning balance |  | $ | (18) |  |  | $ | (17) |  |  | $ | (17) |  |  | $ | (36) |
Credit losses on securities for which credit losses not previously reported |  | — |  |  | (4) |  |  | (1) |  |  | (7) |
Net (increases) decreases related to credit losses previously reported |  | 1 |  |  | (1) |  |  | 1 |  |  | 3 |
(Increase) decrease related to sales and other |  | — |  |  | — |  |  | — |  |  | 3 |
Write-offs |  | — |  |  | 3 |  |  | — |  |  | 18 |
Ending balance |  | $ | (17) |  |  | $ | (19) |  |  | $ | (17) |  |  | $ | (19) |
Components of credit loss allowance as of June 30 |  |  |  |  |  |  |  |
Corporate bonds |  |  |  |  |  | (16) |  |  | (18) |
ABS |  |  |  |  |  | (1) |  |  | (1) |
Total |  |  |  |  |  | $ | (17) |  |  | $ | (19) |
Rollforward of credit loss allowance for mortgage loans
|  | Three months ended June 30, |  | Six months ended June 30,
($ in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Beginning balance |  | $ | (12) |  |  | $ | (11) |  |  | $ | (12) |  |  | $ | (11) |
Net (increases) decreases related to credit losses |  | — |  |  | 1 |  |  | — |  |  | 1 |
Write-offs |  | — |  |  | — |  |  | — |  |  | — |
Ending balance |  | $ | (12) |  |  | $ | (10) |  |  | $ | (12) |  |  | $ | (10) |
Components of credit loss allowance as of June 30 |  |  |  |  |  |  |  |
Commercial |  |  |  |  |  | $ | (11) |  |  | $ | (10) |
Residential |  |  |  |  |  | (1) |  |  | — |
Total |  |  |  |  |  | $ | (12) |  |  | $ | (10) |
Rollforward of credit loss allowance for bank loans |  |  |  |  |  |
($ in millions) |  | Three months ended June 30, |  | Six months ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Beginning balance |  | $ | (16) |  |  | $ | (13) |  |  | $ | (10) |  |  | $ | (22) |
Net (increases) decreases related to credit losses |  | (1) |  |  | 2 |  |  | (9) |  |  | 5 |
Write-offs |  | — |  |  | — |  |  | 2 |  |  | 6 |
Ending balance |  | $ | (17) |  |  | $ | (11) |  |  | $ | (17) |  |  | $ | (11) |
Schedule of Gross Unrealized Losses and Fair Value by Type and Length of Time Held in a Continuous Unrealized Loss Position |
Gross unrealized losses and fair value by type and length of time held in a continuous unrealized loss position (1)
($ in millions) |  | Less than 12 months |  | 12 months or more |  | Total unrealized losses
| Number of issues |  | Fair value |  | Unrealized losses |  | Number of issues |  | Fair value |  | Unrealized losses |
June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agencies |  | 81 |  |  | $ | 1,179 |  |  | $ | (5) |  |  | 56 |  |  | $ | 357 |  |  | $ | (9) |  |  | $ | (14) |
Municipal |  | 571 |  |  | 3,703 |  |  | (123) |  |  | 697 |  |  | 1,176 |  |  | (71) |  |  | (194) |
Corporate |  | 366 |  |  | 2,456 |  |  | (53) |  |  | 948 |  |  | 5,750 |  |  | (304) |  |  | (357) |
Foreign government |  | 53 |  |  | 298 |  |  | (4) |  |  | 62 |  |  | 47 |  |  | (8) |  |  | (12) |
ABS |  | 40 |  |  | 164 |  |  | (1) |  |  | 12 |  |  | 44 |  |  | (3) |  |  | (4) |
MBS |  | 14 |  |  | 6 |  |  | — |  |  | 68 |  |  | 4 |  |  | — |  |  | — |
Total fixed income securities |  | 1,125 |  |  | $ | 7,806 |  |  | $ | (186) |  |  | 1,843 |  |  | $ | 7,378 |  |  | $ | (395) |  |  | $ | (581) |
Investment grade fixed income securities |  | 981 |  |  | $ | 7,362 |  |  | $ | (160) |  |  | 1,665 |  |  | $ | 6,524 |  |  | $ | (350) |  |  | $ | (510) |
Below investment grade fixed income securities |  | 144 |  |  | 444 |  |  | (26) |  |  | 178 |  |  | 854 |  |  | (45) |  |  | (71) |
Total fixed income securities |  | 1,125 |  |  | $ | 7,806 |  |  | $ | (186) |  |  | 1,843 |  |  | $ | 7,378 |  |  | $ | (395) |  |  | $ | (581) |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agencies |  | 179 |  |  | $ | 8,520 |  |  | $ | (256) |  |  | 99 |  |  | $ | 801 |  |  | $ | (74) |  |  | $ | (330) |
Municipal |  | 990 |  |  | 4,889 |  |  | (67) |  |  | 1,089 |  |  | 1,693 |  |  | (109) |  |  | (176) |
Corporate |  | 943 |  |  | 9,178 |  |  | (166) |  |  | 1,237 |  |  | 7,877 |  |  | (544) |  |  | (710) |
Foreign government |  | 42 |  |  | 159 |  |  | (2) |  |  | 73 |  |  | 73 |  |  | (8) |  |  | (10) |
ABS |  | 15 |  |  | 76 |  |  | — |  |  | 15 |  |  | 51 |  |  | (4) |  |  | (4) |
MBS |  | 35 |  |  | 2 |  |  | — |  |  | 70 |  |  | 5 |  |  | — |  |  | — |
Total fixed income securities |  | 2,204 |  |  | $ | 22,824 |  |  | $ | (491) |  |  | 2,583 |  |  | $ | 10,500 |  |  | $ | (739) |  |  | $ | (1,230) |
Investment grade fixed income securities |  | 2,002 |  |  | $ | 21,846 |  |  | $ | (473) |  |  | 2,367 |  |  | $ | 9,281 |  |  | $ | (655) |  |  | $ | (1,128) |
Below investment grade fixed income securities |  | 202 |  |  | 978 |  |  | (18) |  |  | 216 |  |  | 1,219 |  |  | (84) |  |  | (102) |
Total fixed income securities |  | 2,204 |  |  | $ | 22,824 |  |  | $ | (491) |  |  | 2,583 |  |  | $ | 10,500 |  |  | $ | (739) |  |  | $ | (1,230) |
(1)Includes fixed income securities with fair values of $10 million and $16 million and unrealized losses of $1 million and $1 million with credit loss allowances of $1 million and $3 million as of June 30, 2025 and December 31, 2024, respectively.
Schedule of Gross Unrealized Losses by Unrealized Loss Position and Credit Quality |
Gross unrealized losses by unrealized loss position and credit quality as of June 30, 2025
($ in millions) |  | Investment grade |  | Below investment grade |  | Total
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (1) |  | $ | (477) |  |  | $ | (60) |  |  | $ | (537) |
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost, net (2) |  | (33) |  |  | (11) |  |  | (44) |
Total unrealized losses |  | $ | (510) |  |  | $ | (71) |  |  | $ | (581) |
(1)Related to securities with an unrealized loss position less than 20% of amortized cost, net, the degree of which suggests that these securities do not pose a high risk of having credit losses. (2)Evaluated based on factors such as discounted cash flows and the financial condition and near-term and long-term prospects of the issue or issuer and were determined to have adequate resources to fulfill contractual obligations.
Schedule of Mortgage Loans Amortized Cost by Debt Service Coverage Ratio Distribution and Year of Origination |
Commercial mortgage loans amortized cost by debt service coverage ratio distribution and year of origination
|  | June 30, 2025 |  | December 31, 2024
($ in millions) |  | 2020 and prior |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Total |  | Total
1.0 - 1.25 |  | $ | 37 |  |  | $ | — |  |  | $ | 18 |  |  | $ | 25 |  |  | $ | 46 |  |  | $ | — |  |  | $ | 126 |  |  | $ | 137 |
1.26 - 1.50 |  | 56 |  |  | — |  |  | 24 |  |  | 18 |  |  | — |  |  | — |  |  | 98 |  |  | 105 |
Above 1.50 |  | 179 |  |  | 164 |  |  | 48 |  |  | 76 |  |  | 15 |  |  | — |  |  | 482 |  |  | 493 |
Amortized cost before allowance |  | $ | 272 |  |  | $ | 164 |  |  | $ | 90 |  |  | $ | 119 |  |  | $ | 61 |  |  | $ | — |  |  | $ | 706 |  |  | $ | 735 |
Allowance |  |  |  |  |  |  |  |  |  |  |  |  |  | (11) |  |  | (12) |
Amortized cost, net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 695 |  |  | $ | 723 |
Schedule of Bank Loans Amortized Cost by Credit Rating and Year of Origination |
Bank loans amortized cost by credit rating and year of origination
|  | June 30, 2025 |  | December 31, 2024
($ in millions) |  | 2020 and prior |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Total |  | Total
NAIC 1 / A |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 45 |  |  | $ | 111 |  |  | $ | 156 |  |  | $ | 45 |
NAIC 2 / BBB |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 41 |  |  | 42 |  |  | 6 |
NAIC 3 / BB |  | — |  |  | — |  |  | 1 |  |  | 2 |  |  | 13 |  |  | 11 |  |  | 27 |  |  | 27 |
NAIC 4 / B |  | 19 |  |  | 2 |  |  | — |  |  | 30 |  |  | 41 |  |  | 25 |  |  | 117 |  |  | 122 |
NAIC 5-6 / CCC and below |  | — |  |  | — |  |  | 1 |  |  | 7 |  |  | 1 |  |  | 1 |  |  | 10 |  |  | 11 |
Amortized cost before allowance |  | $ | 19 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 39 |  |  | $ | 101 |  |  | $ | 189 |  |  | $ | 352 |  |  | $ | 211 |
Allowance |  |  |  |  |  |  |  |  |  |  |  |  |  | (17) |  |  | (10) |
Amortized cost, net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 335 |  |  | $ | 201 |

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