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Reinsurance (Tables) | 6 Months Ended
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Jun. 30, 2025
Reinsurance Disclosures [Abstract] |
schedule of reinsurance recoverable on ceded insurance |
|  | June 30, 2025 |  | December 31, 2024
(in millions of U.S. dollars) | Net Reinsurance Recoverable (1) |  | Valuation allowance |  | Net Reinsurance Recoverable (1) |  | Valuation allowance
Reinsurance recoverable on unpaid losses and loss expenses | $ | 17,691 |  |  | $ | 261 |  |  | $ | 17,734 |  |  | $ | 242 |
Reinsurance recoverable on paid losses and loss expenses | 1,904 |  |  | 62 |  |  | 2,043 |  |  | 68 |
Reinsurance recoverable on losses and loss expenses | $ | 19,595 |  |  | $ | 323 |  |  | $ | 19,777 |  |  | $ | 310 |
Reinsurance recoverable on policy benefits | $ | 297 |  |  | $ | — |  |  | $ | 289 |  |  | $ | — |
(1)Net of valuation allowance for uncollectible reinsurance.
Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block] | The following table presents a roll-forward of valuation allowance for uncollectible reinsurance related to Reinsurance recoverable on losses and loss expenses:
| Six Months Ended
| June 30
(in millions of U.S. dollars) | 2025 |  | 2024
Valuation allowance for uncollectible reinsurance - beginning of period | $ | 310 |  |  | $ | 367 |
Provision for uncollectible reinsurance | 17 |  |  | 18 |
Write-offs charged against the valuation allowance | (6) |  |  | (3) |
Foreign exchange revaluation | 2 |  |  | (1) |
Valuation allowance for uncollectible reinsurance - end of period | $ | 323 |  |  | $ | 381 |

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- Definition Tabular disclosure of allowance for credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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