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Insurance - Short-duration insurance contracts, historical claims duration (Details) - Property and casualty insurance
Dec. 31, 2025
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 29.20%
Year 2 24.60%
Year 3 11.90%
Year 4 9.00%
Year 5 6.60%
Year 6 4.80%
Year 7 3.30%
Year 8 2.60%
Year 9 1.30%
Year 10 1.00%
Year 1, Cumulative 29.20%
Year 2, Cumulative 53.80%
Year 3, Cumulative 65.70%
Year 4, Cumulative 74.70%
Year 5, Cumulative 81.30%
Year 6, Cumulative 86.10%
Year 7, Cumulative 89.40%
Year 8, Cumulative 92.00%
Year 9, Cumulative 93.30%
Year 10, Cumulative 94.30%
Property and transportation  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 44.00%
Year 2 31.60%
Year 3 7.90%
Year 4 5.40%
Year 5 3.60%
Year 6 2.40%
Year 7 1.40%
Year 8 1.20%
Year 9 0.30%
Year 10 0.30%
Year 1, Cumulative 44.00%
Year 2, Cumulative 75.60%
Year 3, Cumulative 83.50%
Year 4, Cumulative 88.90%
Year 5, Cumulative 92.50%
Year 6, Cumulative 94.90%
Year 7, Cumulative 96.30%
Year 8, Cumulative 97.50%
Year 9, Cumulative 97.80%
Year 10, Cumulative 98.10%
Specialty casualty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 15.00%
Year 2 19.50%
Year 3 15.20%
Year 4 12.30%
Year 5 9.40%
Year 6 6.90%
Year 7 4.90%
Year 8 3.80%
Year 9 1.90%
Year 10 1.50%
Year 1, Cumulative 15.00%
Year 2, Cumulative 34.50%
Year 3, Cumulative 49.70%
Year 4, Cumulative 62.00%
Year 5, Cumulative 71.40%
Year 6, Cumulative 78.30%
Year 7, Cumulative 83.20%
Year 8, Cumulative 87.00%
Year 9, Cumulative 88.90%
Year 10, Cumulative 90.40%
Specialty financial  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 52.00%
Year 2 24.70%
Year 3 9.00%
Year 4 2.50%
Year 5 1.70%
Year 6 1.20%
Year 7 1.20%
Year 8 0.50%
Year 9 0.70%
Year 10 0.60%
Year 1, Cumulative 52.00%
Year 2, Cumulative 76.70%
Year 3, Cumulative 85.70%
Year 4, Cumulative 88.20%
Year 5, Cumulative 89.90%
Year 6, Cumulative 91.10%
Year 7, Cumulative 92.30%
Year 8, Cumulative 92.80%
Year 9, Cumulative 93.50%
Year 10, Cumulative 94.10%