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Insurance - Short-duration insurance contracts, historical claims duration (Details) - Property and casualty insurance
Dec. 31, 2023
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 29.70%
Year 2 25.00%
Year 3 12.20%
Year 4 8.90%
Year 5 6.20%
Year 6 4.20%
Year 7 2.80%
Year 8 1.80%
Year 9 1.40%
Year 10 1.20%
Year 1, Cumulative 29.70%
Year 2, Cumulative 54.70%
Year 3, Cumulative 66.90%
Year 4, Cumulative 75.80%
Year 5, Cumulative 82.00%
Year 6, Cumulative 86.20%
Year 7, Cumulative 89.00%
Year 8, Cumulative 90.80%
Year 9, Cumulative 92.20%
Year 10, Cumulative 93.40%
Property and transportation  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 44.70%
Year 2 31.50%
Year 3 8.30%
Year 4 5.40%
Year 5 3.50%
Year 6 2.00%
Year 7 1.00%
Year 8 0.60%
Year 9 0.50%
Year 10 0.10%
Year 1, Cumulative 44.70%
Year 2, Cumulative 76.20%
Year 3, Cumulative 84.50%
Year 4, Cumulative 89.90%
Year 5, Cumulative 93.40%
Year 6, Cumulative 95.40%
Year 7, Cumulative 96.40%
Year 8, Cumulative 97.00%
Year 9, Cumulative 97.50%
Year 10, Cumulative 97.60%
Specialty casualty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 16.40%
Year 2 20.90%
Year 3 15.40%
Year 4 11.90%
Year 5 8.40%
Year 6 5.90%
Year 7 4.00%
Year 8 3.00%
Year 9 2.00%
Year 10 1.90%
Year 1, Cumulative 16.40%
Year 2, Cumulative 37.30%
Year 3, Cumulative 52.70%
Year 4, Cumulative 64.60%
Year 5, Cumulative 73.00%
Year 6, Cumulative 78.90%
Year 7, Cumulative 82.90%
Year 8, Cumulative 85.90%
Year 9, Cumulative 87.90%
Year 10, Cumulative 89.80%
Specialty financial  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 51.80%
Year 2 26.30%
Year 3 9.90%
Year 4 2.20%
Year 5 1.60%
Year 6 0.70%
Year 7 1.60%
Year 8 (0.10%)
Year 9 0.00%
Year 10 0.00%
Year 1, Cumulative 51.80%
Year 2, Cumulative 78.10%
Year 3, Cumulative 88.00%
Year 4, Cumulative 90.20%
Year 5, Cumulative 91.80%
Year 6, Cumulative 92.50%
Year 7, Cumulative 94.10%
Year 8, Cumulative 94.00%
Year 9, Cumulative 94.00%
Year 10, Cumulative 94.00%
Other specialty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 10.50%
Year 2 12.60%
Year 3 13.60%
Year 4 16.00%
Year 5 12.00%
Year 6 11.10%
Year 7 5.90%
Year 8 1.70%
Year 9 4.30%
Year 10 5.60%
Year 1, Cumulative 10.50%
Year 2, Cumulative 23.10%
Year 3, Cumulative 36.70%
Year 4, Cumulative 52.70%
Year 5, Cumulative 64.70%
Year 6, Cumulative 75.80%
Year 7, Cumulative 81.70%
Year 8, Cumulative 83.40%
Year 9, Cumulative 87.70%
Year 10, Cumulative 93.30%