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Insurance - Short-duration insurance contracts, historical claims duration (Details) - Property and casualty insurance
Dec. 31, 2021
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 31.80%
Year 2 24.60%
Year 3 12.10%
Year 4 8.90%
Year 5 5.60%
Year 6 3.50%
Year 7 2.50%
Year 8 1.10%
Year 9 1.00%
Year 10 0.50%
Year 1, Cumulative 31.80%
Year 2, Cumulative 56.40%
Year 3, Cumulative 68.50%
Year 4, Cumulative 77.40%
Year 5, Cumulative 83.00%
Year 6, Cumulative 86.50%
Year 7, Cumulative 89.00%
Year 8, Cumulative 90.10%
Year 9, Cumulative 91.10%
Year 10, Cumulative 91.60%
Property and transportation  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 47.50%
Year 2 29.40%
Year 3 7.80%
Year 4 5.30%
Year 5 3.10%
Year 6 1.70%
Year 7 1.40%
Year 8 (0.30%)
Year 9 0.20%
Year 10 0.10%
Year 1, Cumulative 47.50%
Year 2, Cumulative 76.90%
Year 3, Cumulative 84.70%
Year 4, Cumulative 90.00%
Year 5, Cumulative 93.10%
Year 6, Cumulative 94.80%
Year 7, Cumulative 96.20%
Year 8, Cumulative 95.90%
Year 9, Cumulative 96.10%
Year 10, Cumulative 96.20%
Specialty casualty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 17.40%
Year 2 21.70%
Year 3 15.90%
Year 4 12.10%
Year 5 7.80%
Year 6 5.00%
Year 7 3.30%
Year 8 2.70%
Year 9 1.70%
Year 10 1.00%
Year 1, Cumulative 17.40%
Year 2, Cumulative 39.10%
Year 3, Cumulative 55.00%
Year 4, Cumulative 67.10%
Year 5, Cumulative 74.90%
Year 6, Cumulative 79.90%
Year 7, Cumulative 83.20%
Year 8, Cumulative 85.90%
Year 9, Cumulative 87.60%
Year 10, Cumulative 88.60%
Specialty financial  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 52.10%
Year 2 26.50%
Year 3 9.40%
Year 4 3.20%
Year 5 2.20%
Year 6 1.50%
Year 7 1.00%
Year 8 (0.80%)
Year 9 (0.40%)
Year 10 0.00%
Year 1, Cumulative 52.10%
Year 2, Cumulative 78.60%
Year 3, Cumulative 88.00%
Year 4, Cumulative 91.20%
Year 5, Cumulative 93.40%
Year 6, Cumulative 94.90%
Year 7, Cumulative 95.90%
Year 8, Cumulative 95.10%
Year 9, Cumulative 94.70%
Year 10, Cumulative 94.70%
Other specialty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 12.20%
Year 2 14.30%
Year 3 12.60%
Year 4 17.30%
Year 5 9.70%
Year 6 9.00%
Year 7 5.80%
Year 8 3.40%
Year 9 4.60%
Year 10 2.60%
Year 1, Cumulative 12.20%
Year 2, Cumulative 26.50%
Year 3, Cumulative 39.10%
Year 4, Cumulative 56.40%
Year 5, Cumulative 66.10%
Year 6, Cumulative 75.10%
Year 7, Cumulative 80.90%
Year 8, Cumulative 84.30%
Year 9, Cumulative 88.90%
Year 10, Cumulative 91.50%