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Income Taxes - Reconciliation of effective tax rate by jurisdiction (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Effective Income Tax Rate Reconciliation, Amount |  |  |
Income tax provision at Bermuda statutory tax rate | $ 774 | $ 424 | $ 300
Foreign tax effects |  |  |
Other |  | 8 | 8
Other foreign taxes | 7 |  |
Effect of changes in tax laws or rates enacted in the current period | (65) | 12 | (1,179)
Nontaxable or nondeductible items / other |  |  |
Investment income | (54) | (39) | (14)
Other | (22) |  |
Other | 20 |  |
Income tax expense (benefit) | $ 760 | $ 362 | $ (873)
Effective Income Tax Rate Reconciliation, Percent |  |  |
Bermuda Federal Statutory Tax Rate | 15.00% |  |
Foreign tax effects |  |  |
Other foreign taxes | 0.10% |  |
Effect of changes in tax laws or rates enacted in the current period | (1.30%) |  |
Nontaxable or nondeductible items / other |  |  |
Investment income | (1.00%) |  |
Other | (0.40%) |  |
Other | 0.30% |  |
Total | 14.70% |  |
United States |  |  |
Foreign tax effects |  |  |
Tax rate differential | $ 99 |  |
Other | $ (17) |  |
Foreign tax effects |  |  |
Tax rate differential | 1.90% |  |
Other | (0.30%) |  |
Bermuda |  |  |
Foreign tax effects |  |  |
Foreign tax credits | $ (56) |  |
Other | $ 20 |  |
Foreign tax effects |  |  |
Foreign tax credits | (1.10%) |  |
Other | 0.40% |  |
United Kingdom |  |  |
Foreign tax effects |  |  |
Effect of cross-border tax laws | $ 45 |  |
Other | $ 9 |  |
Foreign tax effects |  |  |
Effect of cross-border tax laws | 0.90% |  |
Other | 0.20% |  |

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