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Insurance - Short-duration insurance contracts, historical claims duration (Details) - Property and casualty insurance
Dec. 31, 2017
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 32.70%
Year 2 26.10%
Year 3 12.10%
Year 4 8.50%
Year 5 5.30%
Year 6 3.30%
Year 7 1.80%
Year 8 1.20%
Year 9 0.80%
Year 10 1.00%
Year 1, Cumulative 32.70%
Year 2, Cumulative 58.80%
Year 3, Cumulative 70.90%
Year 4, Cumulative 79.40%
Year 5, Cumulative 84.70%
Year 6, Cumulative 88.00%
Year 7, Cumulative 89.80%
Year 8, Cumulative 91.00%
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 45.90%
Year 2 29.90%
Year 3 8.40%
Year 4 6.30%
Year 5 3.70%
Year 6 1.90%
Year 7 0.90%
Year 8 0.30%
Year 9 0.40%
Year 10 0.10%
Year 1, Cumulative 45.90%
Year 2, Cumulative 75.80%
Year 3, Cumulative 84.20%
Year 4, Cumulative 90.50%
Year 5, Cumulative 94.20%
Year 6, Cumulative 96.10%
Year 7, Cumulative 97.00%
Year 8, Cumulative 97.30%
Year 9, Cumulative 97.70%
Year 10, Cumulative 97.80%
Specialty casualty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 18.60%
Year 2 23.40%
Year 3 16.20%
Year 4 11.00%
Year 5 6.90%
Year 6 4.60%
Year 7 2.80%
Year 8 2.10%
Year 9 1.60%
Year 10 1.60%
Year 1, Cumulative 18.60%
Year 2, Cumulative 42.00%
Year 3, Cumulative 58.20%
Year 4, Cumulative 69.20%
Year 5, Cumulative 76.10%
Year 6, Cumulative 80.70%
Year 7, Cumulative 83.50%
Year 8, Cumulative 85.60%
Year 9, Cumulative 87.20%
Year 10, Cumulative 88.80%
Specialty financial  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 49.80%
Year 2 26.30%
Year 3 8.30%
Year 4 5.70%
Year 5 3.60%
Year 6 2.00%
Year 7 0.20%
Year 8 0.10%
Year 9 0.00%
Year 10 1.50%
Year 1, Cumulative 49.80%
Year 2, Cumulative 76.10%
Year 3, Cumulative 84.40%
Year 4, Cumulative 90.10%
Year 5, Cumulative 93.70%
Year 6, Cumulative 95.70%
Year 7, Cumulative 95.90%
Year 8, Cumulative 96.00%
Year 9, Cumulative 96.00%
Year 10, Cumulative 97.50%
Other specialty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 19.80%
Year 2 17.30%
Year 3 12.50%
Year 4 12.80%
Year 5 8.90%
Year 6 5.90%
Year 7 3.30%
Year 8 2.90%
Year 9 (0.40%)
Year 10 2.30%
Year 1, Cumulative 19.80%
Year 2, Cumulative 37.10%
Year 3, Cumulative 49.60%
Year 4, Cumulative 62.40%
Year 5, Cumulative 71.30%
Year 6, Cumulative 77.20%
Year 7, Cumulative 80.50%
Year 8, Cumulative 83.40%
Year 9, Cumulative 83.00%
Year 10, Cumulative 85.30%