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Insurance - Short-duration insurance contracts, historical claims duration (Details) - Property and casualty insurance
Dec. 31, 2019
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 32.60%
Year 2 25.70%
Year 3 12.10%
Year 4 8.90%
Year 5 5.60%
Year 6 3.10%
Year 7 2.10%
Year 8 0.80%
Year 9 0.90%
Year 10 1.00%
Year 1, Cumulative 32.60%
Year 2, Cumulative 58.30%
Year 3, Cumulative 70.40%
Year 4, Cumulative 79.30%
Year 5, Cumulative 84.90%
Year 6, Cumulative 88.00%
Year 7, Cumulative 90.10%
Year 8, Cumulative 90.90%
Year 9, Cumulative 91.80%
Year 10, Cumulative 92.80%
Property and transportation  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 47.10%
Year 2 29.80%
Year 3 7.70%
Year 4 6.00%
Year 5 3.60%
Year 6 1.80%
Year 7 1.50%
Year 8 (0.10%)
Year 9 0.20%
Year 10 0.20%
Year 1, Cumulative 47.10%
Year 2, Cumulative 76.90%
Year 3, Cumulative 84.60%
Year 4, Cumulative 90.60%
Year 5, Cumulative 94.20%
Year 6, Cumulative 96.00%
Year 7, Cumulative 97.50%
Year 8, Cumulative 97.40%
Year 9, Cumulative 97.60%
Year 10, Cumulative 97.80%
Specialty casualty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 18.70%
Year 2 22.90%
Year 3 16.40%
Year 4 11.50%
Year 5 7.30%
Year 6 4.30%
Year 7 2.70%
Year 8 1.90%
Year 9 1.60%
Year 10 1.80%
Year 1, Cumulative 18.70%
Year 2, Cumulative 41.60%
Year 3, Cumulative 58.00%
Year 4, Cumulative 69.50%
Year 5, Cumulative 76.80%
Year 6, Cumulative 81.10%
Year 7, Cumulative 83.80%
Year 8, Cumulative 85.70%
Year 9, Cumulative 87.30%
Year 10, Cumulative 89.10%
Specialty financial  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 50.50%
Year 2 27.70%
Year 3 7.90%
Year 4 5.40%
Year 5 4.20%
Year 6 0.90%
Year 7 0.20%
Year 8 (0.80%)
Year 9 0.00%
Year 10 0.00%
Year 1, Cumulative 50.50%
Year 2, Cumulative 78.20%
Year 3, Cumulative 86.10%
Year 4, Cumulative 91.50%
Year 5, Cumulative 95.70%
Year 6, Cumulative 96.60%
Year 7, Cumulative 96.80%
Year 8, Cumulative 96.00%
Year 9, Cumulative 96.00%
Year 10, Cumulative 96.00%
Other specialty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 16.60%
Year 2 16.50%
Year 3 13.20%
Year 4 14.90%
Year 5 10.50%
Year 6 9.80%
Year 7 4.90%
Year 8 3.50%
Year 9 2.50%
Year 10 0.00%
Year 1, Cumulative 16.60%
Year 2, Cumulative 33.10%
Year 3, Cumulative 46.30%
Year 4, Cumulative 61.20%
Year 5, Cumulative 71.70%
Year 6, Cumulative 81.50%
Year 7, Cumulative 86.40%
Year 8, Cumulative 89.90%
Year 9, Cumulative 92.40%
Year 10, Cumulative 92.40%