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Investments (Tables) | 6 Months Ended
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Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities |
June 30, 2025 | Amortized Cost |  | Valuation Allowance |  | Gross Unrealized Appreciation |  | Gross Unrealized Depreciation |  | Fair Value |  |  |  |  |
(in millions of U.S. dollars) |  |  |  |  |  |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. and local government securities | $ | 4,271 |  |  | $ | — |  |  | $ | 19 |  |  | $ | (257) |  |  | $ | 4,033 |  |  |  |  |  |
Non-U.S. | 38,411 |  |  | (20) |  |  | 983 |  |  | (911) |  |  | 38,463 |  |  |  |  |  |
Corporate and asset-backed securities | 46,411 |  |  | (51) |  |  | 568 |  |  | (1,802) |  |  | 45,126 |  |  |  |  |  |
Mortgage-backed securities | 29,854 |  |  | — |  |  | 173 |  |  | (1,530) |  |  | 28,497 |  |  |  |  |  |
| $ | 118,947 |  |  | $ | (71) |  |  | $ | 1,743 |  |  | $ | (4,500) |  |  | $ | 116,119 |  |  |  |  |  |
December 31, 2024 | Amortized Cost |  | Valuation Allowance |  | Gross Unrealized Appreciation |  | Gross Unrealized Depreciation |  | Fair Value |  |  |  |  |  |  |  |  |  |  |
(in millions of U.S. dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. and local government securities | $ | 4,383 |  |  | $ | — |  |  | $ | 10 |  |  | $ | (323) |  |  | $ | 4,070 |  |  |  |  |  |  |  |  |  |  |  |
Non-U.S. | 36,311 |  |  | (23) |  |  | 753 |  |  | (1,203) |  |  | 35,838 |  |  |  |  |  |  |  |  |  |  |  |
Corporate and asset-backed securities | 45,231 |  |  | (47) |  |  | 287 |  |  | (2,264) |  |  | 43,207 |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | 29,158 |  |  | — |  |  | 69 |  |  | (1,979) |  |  | 27,248 |  |  |  |  |  |  |  |  |  |  |  |
| $ | 115,083 |  |  | $ | (70) |  |  | $ | 1,119 |  |  | $ | (5,769) |  |  | $ | 110,363 |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Fixed Maturities By Contractual Maturity | The following table presents fixed maturities by contractual maturity:
| June 30, 2025 |  | December 31, 2024
(in millions of U.S. dollars) | Net Carrying Value |  | Fair Value |  | Net Carrying Value |  | Fair Value
Available-for-sale |  |  |  |  |  |  |
Due in 1 year or less | $ | 5,175 |  |  | $ | 5,175 |  |  | $ | 4,507 |  |  | $ | 4,507 |
Due after 1 year through 5 years | 36,243 |  |  | 36,243 |  |  | 33,446 |  |  | 33,446 |
Due after 5 years through 10 years | 27,636 |  |  | 27,636 |  |  | 26,901 |  |  | 26,901 |
Due after 10 years | 18,568 |  |  | 18,568 |  |  | 18,261 |  |  | 18,261 |
| 87,622 |  |  | 87,622 |  |  | 83,115 |  |  | 83,115 |
Mortgage-backed securities | 28,497 |  |  | 28,497 |  |  | 27,248 |  |  | 27,248 |
| $ | 116,119 |  |  | $ | 116,119 |  |  | $ | 110,363 |  |  | $ | 110,363 |
Unrealized Gain (Loss) on Investments | The following tables present, for available-for-sale (AFS) fixed maturities in an unrealized loss position (including securities on loan) that are not deemed to have expected credit losses, the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:
| 0 – 12 Months |  | Over 12 Months |  | Total
June 30, 2025 | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss
(in millions of U.S. dollars) |  |  |  |  |
U.S. and local government securities | $ | 528 |  |  | $ | (7) |  |  | $ | 2,386 |  |  | $ | (248) |  |  | $ | 2,914 |  |  | $ | (255) |
Non-U.S. | 3,265 |  |  | (65) |  |  | 10,654 |  |  | (668) |  |  | 13,919 |  |  | (733) |
Corporate and asset-backed securities | 4,608 |  |  | (90) |  |  | 11,476 |  |  | (867) |  |  | 16,084 |  |  | (957) |
Mortgage-backed securities | 4,391 |  |  | (39) |  |  | 11,676 |  |  | (1,490) |  |  | 16,067 |  |  | (1,529) |
Total AFS fixed maturities | $ | 12,792 |  |  | $ | (201) |  |  | $ | 36,192 |  |  | $ | (3,273) |  |  | $ | 48,984 |  |  | $ | (3,474) |
| 0 – 12 Months |  | Over 12 Months |  | Total
December 31, 2024 | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss
(in millions of U.S. dollars) |  |  |  |  |
U.S. and local government securities | $ | 767 |  |  | $ | (16) |  |  | $ | 2,489 |  |  | $ | (303) |  |  | $ | 3,256 |  |  | $ | (319) |
Non-U.S. | 6,630 |  |  | (138) |  |  | 12,023 |  |  | (874) |  |  | 18,653 |  |  | (1,012) |
Corporate and asset-backed securities | 10,069 |  |  | (194) |  |  | 13,290 |  |  | (1,259) |  |  | 23,359 |  |  | (1,453) |
Mortgage-backed securities | 10,490 |  |  | (170) |  |  | 11,987 |  |  | (1,794) |  |  | 22,477 |  |  | (1,964) |
Total AFS fixed maturities | $ | 27,956 |  |  | $ | (518) |  |  | $ | 39,789 |  |  | $ | (4,230) |  |  | $ | 67,745 |  |  | $ | (4,748) |
Debt Securities, Available-for-sale, Allowance for Credit Loss | The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities:
| Three Months Ended |  | Six Months Ended
| June 30 |  | June 30
(in millions of U.S. dollars) | 2025 |  | 2024 |  | 2025 |  | 2024
Available-for-sale |  |  |  |  |  |  |
Valuation allowance for expected credit losses - beginning of period | $ | 63 |  |  | $ | 115 |  |  | $ | 70 |  |  | $ | 156 |
Provision for expected credit loss | 30 |  |  | 41 |  |  | 51 |  |  | 72 |
Write-offs charged against the expected credit loss | (1) |  |  | — |  |  | (1) |  |  | (5) |
Recovery of expected credit loss | (21) |  |  | (34) |  |  | (49) |  |  | (101) |
Valuation allowance for expected credit losses - end of period | $ | 71 |  |  | $ | 122 |  |  | $ | 71 |  |  | $ | 122 |
Private debt held-for-investment |  |  |  |  |  |  |
Valuation allowance for expected credit losses - beginning of period | $ | 3 |  |  | $ | 5 |  |  | $ | 4 |  |  | $ | 4 |
Provision for expected credit loss | — |  |  | 1 |  |  | — |  |  | 2 |
Recovery of expected credit loss | — |  |  | (1) |  |  | (1) |  |  | (1) |
Valuation allowance for expected credit losses - end of period | $ | 3 |  |  | $ | 5 |  |  | $ | 3 |  |  | $ | 5 |
Private debt held-for-investment, allowance for credit loss | The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities:
| Three Months Ended |  | Six Months Ended
| June 30 |  | June 30
(in millions of U.S. dollars) | 2025 |  | 2024 |  | 2025 |  | 2024
Available-for-sale |  |  |  |  |  |  |
Valuation allowance for expected credit losses - beginning of period | $ | 63 |  |  | $ | 115 |  |  | $ | 70 |  |  | $ | 156 |
Provision for expected credit loss | 30 |  |  | 41 |  |  | 51 |  |  | 72 |
Write-offs charged against the expected credit loss | (1) |  |  | — |  |  | (1) |  |  | (5) |
Recovery of expected credit loss | (21) |  |  | (34) |  |  | (49) |  |  | (101) |
Valuation allowance for expected credit losses - end of period | $ | 71 |  |  | $ | 122 |  |  | $ | 71 |  |  | $ | 122 |
Private debt held-for-investment |  |  |  |  |  |  |
Valuation allowance for expected credit losses - beginning of period | $ | 3 |  |  | $ | 5 |  |  | $ | 4 |  |  | $ | 4 |
Provision for expected credit loss | — |  |  | 1 |  |  | — |  |  | 2 |
Recovery of expected credit loss | — |  |  | (1) |  |  | (1) |  |  | (1) |
Valuation allowance for expected credit losses - end of period | $ | 3 |  |  | $ | 5 |  |  | $ | 3 |  |  | $ | 5 |
Schedule of Realized Gain (Loss) | The following table presents the components of net realized gains (losses):
| Three Months Ended |  | Six Months Ended
| June 30 |  | June 30
(in millions of U.S. dollars) | 2025 |  | 2024 |  | 2025 |  | 2024
Fixed maturities: |  |  |  |  |  |  |
Gross realized gains | $ | 69 |  |  | $ | 36 |  |  | $ | 107 |  |  | $ | 52 |
Gross realized losses | (123) |  |  | (106) |  |  | (219) |  |  | (247) |
Other investments - Fixed maturities (2025 includes $53 million and nil related to investments measured under the fair value option) | 61 |  |  | 132 |  |  | 21 |  |  | 300 |
Net (provision for) recovery of expected credit losses | (9) |  |  | (8) |  |  | (1) |  |  | 32 |
Impairment (1) | (5) |  |  | (28) |  |  | (12) |  |  | (62) |
Total fixed maturities | (7) |  |  | 26 |  |  | (104) |  |  | 75 |
Equity securities (2025 includes $12 million and $65 million related to investments measured under the fair value option) | 137 |  |  | 21 |  |  | 200 |  |  | 24 |
Private equities (less than 3 percent ownership) | (28) |  |  | 49 |  |  | (17) |  |  | 80 |
Foreign exchange | (89) |  |  | 27 |  |  | (154) |  |  | (104) |
Investment and embedded derivative instruments | 154 |  |  | (17) |  |  | 131 |  |  | (60) |
Other derivative instruments | (2) |  |  | (3) |  |  | (5) |  |  | (5) |
Other | (5) |  |  | 1 |  |  | (7) |  |  | (7) |
Net realized gains (losses) (pre-tax) | $ | 160 |  |  | $ | 104 |  |  | $ | 44 |  |  | $ | 3 |
(1)Relates to certain securities we intended to sell and securities written to market entering default.
Gain (Loss) on Securities | Realized gains and losses from Equity securities, Other investments and Private equities from the table above include sales of securities and unrealized gains and losses from fair value changes as follows:
|  |  |  |  |  |  |  |  |  |  | Three Months Ended
|  |  |  |  |  |  |  |  |  |  |  |  | June 30
|  |  |  |  |  |  | 2025 |  |  |  |  |  |  |  | 2024
(in millions of U.S. dollars) | Equity Securities |  | Other Investments |  | Private Equities |  | Total |  | Equity Securities |  | Other Investments |  | Private Equities |  | Total
Net gains (losses) recognized during the period | $ | 137 |  |  | $ | 61 |  |  | $ | (28) |  |  | $ | 170 |  |  | $ | 21 |  |  | $ | 132 |  |  | $ | 49 |  |  | $ | 202 |
Less: Net gains (losses) recognized from sales of securities | 32 |  |  | 3 |  |  | — |  |  | 35 |  |  | 14 |  |  | — |  |  | — |  |  | 14 |
Unrealized gains (losses) recognized for securities still held at reporting date | $ | 105 |  |  | $ | 58 |  |  | $ | (28) |  |  | $ | 135 |  |  | $ | 7 |  |  | $ | 132 |  |  | $ | 49 |  |  | $ | 188 |
|  |  |  |  |  |  |  |  |  |  | Six Months Ended
|  |  |  |  |  |  |  |  |  |  |  |  | June 30
|  |  |  |  |  |  | 2025 |  |  |  |  |  |  |  | 2024
(in millions of U.S. dollars) | Equity Securities |  | Other Investments |  | Private Equities |  | Total |  | Equity Securities |  | Other Investments |  | Private Equities |  | Total
Net gains (losses) recognized during the period | $ | 200 |  |  | $ | 21 |  |  | $ | (17) |  |  | $ | 204 |  |  | $ | 24 |  |  | $ | 300 |  |  | $ | 80 |  |  | $ | 404 |
Less: Net gains (losses) recognized from sales of securities | 20 |  |  | 4 |  |  | — |  |  | 24 |  |  | 11 |  |  | — |  |  | — |  |  | 11 |
Unrealized gains (losses) recognized for securities still held at reporting date | $ | 180 |  |  | $ | 17 |  |  | $ | (17) |  |  | $ | 180 |  |  | $ | 13 |  |  | $ | 300 |  |  | $ | 80 |  |  | $ | 393 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share |
| Expected Liquidation Period of Underlying Assets |  | June 30, 2025 |  | December 31, 2024
(in millions of U.S. dollars) | Fair Value |  | Maximum Future Funding Commitments |  | Fair Value |  | Maximum Future Funding Commitments
Financial | 2 to 10 Years |  | $ | 1,402 |  |  | $ | 224 |  |  | $ | 1,265 |  |  | $ | 281 |
Real assets | 2 to 13 Years |  | 1,910 |  |  | 732 |  |  | 1,974 |  |  | 547 |
Distressed | 2 to 8 Years |  | 1,213 |  |  | 1,034 |  |  | 1,257 |  |  | 679 |
Private credit | 3 to 8 Years |  | 305 |  |  | 332 |  |  | 295 |  |  | 285 |
Traditional | 2 to 14 Years |  | 11,153 |  |  | 4,563 |  |  | 9,674 |  |  | 4,650 |
Vintage | 1 to 3 Years |  | 59 |  |  | — |  |  | 64 |  |  | — |
Investment funds | Not Applicable |  | 271 |  |  | — |  |  | 240 |  |  | — |
|  |  | $ | 16,313 |  |  | $ | 6,885 |  |  | $ | 14,769 |  |  | $ | 6,442 |
Schedule Of Components Of Restricted Assets | The following table presents the components of restricted assets:
| June 30 |  | December 31
(in millions of U.S. dollars) | 2025 |  | 2024
Trust funds | $ | 8,438 |  |  | $ | 8,170 |
Assets pledged under repurchase agreements | 3,132 |  |  | 2,890 |
Deposits with U.S. regulatory authorities | 2,540 |  |  | 2,487 |
Deposits with non-U.S. regulatory authorities and other | 4,407 |  |  | 4,659 |
Total | $ | 18,517 |  |  | $ | 18,206 |

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