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Insurance - Short-duration insurance contracts, historical claims duration (Details) - Property and casualty insurance
Dec. 31, 2018
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 32.60%
Year 2 25.50%
Year 3 12.20%
Year 4 8.80%
Year 5 5.50%
Year 6 3.20%
Year 7 2.00%
Year 8 1.20%
Year 9 0.80%
Year 10 0.70%
Year 1, Cumulative 32.60%
Year 2, Cumulative 58.10%
Year 3, Cumulative 70.30%
Year 4, Cumulative 79.10%
Year 5, Cumulative 84.60%
Year 6, Cumulative 87.80%
Year 7, Cumulative 89.80%
Year 8, Cumulative 91.00%
Year 9, Cumulative 91.80%
Year 10, Cumulative 92.50%
Property and transportation  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 46.20%
Year 2 28.70%
Year 3 8.60%
Year 4 6.50%
Year 5 3.70%
Year 6 2.00%
Year 7 1.40%
Year 8 0.40%
Year 9 0.50%
Year 10 0.20%
Year 1, Cumulative 46.20%
Year 2, Cumulative 74.90%
Year 3, Cumulative 83.50%
Year 4, Cumulative 90.00%
Year 5, Cumulative 93.70%
Year 6, Cumulative 95.70%
Year 7, Cumulative 97.10%
Year 8, Cumulative 97.50%
Year 9, Cumulative 98.00%
Year 10, Cumulative 98.20%
Specialty casualty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 19.10%
Year 2 23.20%
Year 3 16.20%
Year 4 11.10%
Year 5 7.00%
Year 6 4.30%
Year 7 2.60%
Year 8 1.90%
Year 9 1.30%
Year 10 1.00%
Year 1, Cumulative 19.10%
Year 2, Cumulative 42.30%
Year 3, Cumulative 58.50%
Year 4, Cumulative 69.60%
Year 5, Cumulative 76.60%
Year 6, Cumulative 80.90%
Year 7, Cumulative 83.50%
Year 8, Cumulative 85.40%
Year 9, Cumulative 86.70%
Year 10, Cumulative 87.70%
Specialty financial  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 50.50%
Year 2 26.40%
Year 3 7.50%
Year 4 5.80%
Year 5 4.70%
Year 6 1.70%
Year 7 0.50%
Year 8 (0.10%)
Year 9 0.00%
Year 10 (0.50%)
Year 1, Cumulative 50.50%
Year 2, Cumulative 76.90%
Year 3, Cumulative 84.40%
Year 4, Cumulative 90.20%
Year 5, Cumulative 94.90%
Year 6, Cumulative 96.60%
Year 7, Cumulative 97.10%
Year 8, Cumulative 97.00%
Year 9, Cumulative 97.00%
Year 10, Cumulative 96.50%
Other specialty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 18.70%
Year 2 17.00%
Year 3 12.60%
Year 4 14.10%
Year 5 9.30%
Year 6 7.60%
Year 7 3.40%
Year 8 3.70%
Year 9 (0.30%)
Year 10 6.30%
Year 1, Cumulative 18.70%
Year 2, Cumulative 35.70%
Year 3, Cumulative 48.30%
Year 4, Cumulative 62.40%
Year 5, Cumulative 71.70%
Year 6, Cumulative 79.30%
Year 7, Cumulative 82.70%
Year 8, Cumulative 86.40%
Year 9, Cumulative 86.10%
Year 10, Cumulative 92.40%