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Insurance - Short-duration insurance contracts, historical claims duration (Details) - Property and casualty insurance
Dec. 31, 2020
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 32.20%
Year 2 25.50%
Year 3 11.90%
Year 4 8.80%
Year 5 5.60%
Year 6 3.20%
Year 7 2.20%
Year 8 0.90%
Year 9 0.90%
Year 10 0.70%
Year 1, Cumulative 32.20%
Year 2, Cumulative 57.70%
Year 3, Cumulative 69.60%
Year 4, Cumulative 78.40%
Year 5, Cumulative 84.00%
Year 6, Cumulative 87.20%
Year 7, Cumulative 89.40%
Year 8, Cumulative 90.30%
Year 9, Cumulative 91.20%
Year 10, Cumulative 91.90%
Property and transportation  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 47.30%
Year 2 30.20%
Year 3 7.70%
Year 4 5.30%
Year 5 3.30%
Year 6 1.60%
Year 7 1.50%
Year 8 (0.30%)
Year 9 0.20%
Year 10 0.10%
Year 1, Cumulative 47.30%
Year 2, Cumulative 77.50%
Year 3, Cumulative 85.20%
Year 4, Cumulative 90.50%
Year 5, Cumulative 93.80%
Year 6, Cumulative 95.40%
Year 7, Cumulative 96.90%
Year 8, Cumulative 96.60%
Year 9, Cumulative 96.80%
Year 10, Cumulative 96.90%
Specialty casualty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 18.00%
Year 2 22.20%
Year 3 16.00%
Year 4 11.90%
Year 5 7.70%
Year 6 4.50%
Year 7 2.90%
Year 8 2.20%
Year 9 1.70%
Year 10 1.20%
Year 1, Cumulative 18.00%
Year 2, Cumulative 40.20%
Year 3, Cumulative 56.20%
Year 4, Cumulative 68.10%
Year 5, Cumulative 75.80%
Year 6, Cumulative 80.30%
Year 7, Cumulative 83.20%
Year 8, Cumulative 85.40%
Year 9, Cumulative 87.10%
Year 10, Cumulative 88.30%
Specialty financial  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 50.60%
Year 2 28.00%
Year 3 8.40%
Year 4 4.00%
Year 5 3.10%
Year 6 1.50%
Year 7 1.00%
Year 8 (0.30%)
Year 9 (0.40%)
Year 10 0.70%
Year 1, Cumulative 50.60%
Year 2, Cumulative 78.60%
Year 3, Cumulative 87.00%
Year 4, Cumulative 91.00%
Year 5, Cumulative 94.10%
Year 6, Cumulative 95.60%
Year 7, Cumulative 96.60%
Year 8, Cumulative 96.30%
Year 9, Cumulative 95.90%
Year 10, Cumulative 96.60%
Other specialty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 14.80%
Year 2 15.70%
Year 3 11.60%
Year 4 17.10%
Year 5 10.20%
Year 6 8.40%
Year 7 4.80%
Year 8 3.80%
Year 9 2.60%
Year 10 0.00%
Year 1, Cumulative 14.80%
Year 2, Cumulative 30.50%
Year 3, Cumulative 42.10%
Year 4, Cumulative 59.20%
Year 5, Cumulative 69.40%
Year 6, Cumulative 77.80%
Year 7, Cumulative 82.60%
Year 8, Cumulative 86.40%
Year 9, Cumulative 89.00%
Year 10, Cumulative 89.00%