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Insurance - Short-duration insurance contracts, historical claims duration (Details) - Property and casualty insurance
Dec. 31, 2016
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 33.00%
Year 2 26.10%
Year 3 11.80%
Year 4 8.50%
Year 5 5.30%
Year 6 3.40%
Year 7 2.00%
Year 8 1.30%
Year 9 1.10%
Year 10 0.60%
Year 1, Cumulative 33.00%
Year 2, Cumulative 59.10%
Year 3, Cumulative 70.90%
Year 4, Cumulative 79.40%
Year 5, Cumulative 84.70%
Year 6, Cumulative 88.10%
Year 7, Cumulative 90.10%
Year 8, Cumulative 91.40%
Year 9, Cumulative 92.50%
Year 10, Cumulative 93.10%
Property and transportation  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 46.50%
Year 2 29.50%
Year 3 7.90%
Year 4 6.10%
Year 5 3.60%
Year 6 2.10%
Year 7 1.00%
Year 8 0.30%
Year 9 0.10%
Year 10 0.20%
Year 1, Cumulative 46.50%
Year 2, Cumulative 76.00%
Year 3, Cumulative 83.90%
Year 4, Cumulative 90.00%
Year 5, Cumulative 93.60%
Year 6, Cumulative 95.70%
Year 7, Cumulative 96.70%
Year 8, Cumulative 97.00%
Year 9, Cumulative 97.10%
Year 10, Cumulative 97.30%
Specialty casualty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 19.00%
Year 2 23.70%
Year 3 16.10%
Year 4 11.00%
Year 5 7.00%
Year 6 4.70%
Year 7 3.00%
Year 8 2.20%
Year 9 2.00%
Year 10 1.10%
Year 1, Cumulative 19.00%
Year 2, Cumulative 42.70%
Year 3, Cumulative 58.80%
Year 4, Cumulative 69.80%
Year 5, Cumulative 76.80%
Year 6, Cumulative 81.50%
Year 7, Cumulative 84.50%
Year 8, Cumulative 86.70%
Year 9, Cumulative 88.70%
Year 10, Cumulative 89.80%
Specialty financial  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 49.90%
Year 2 25.30%
Year 3 7.70%
Year 4 6.10%
Year 5 3.30%
Year 6 1.40%
Year 7 0.10%
Year 8 0.30%
Year 9 0.40%
Year 10 (0.70%)
Year 1, Cumulative 49.90%
Year 2, Cumulative 75.20%
Year 3, Cumulative 82.90%
Year 4, Cumulative 89.00%
Year 5, Cumulative 92.30%
Year 6, Cumulative 93.70%
Year 7, Cumulative 93.80%
Year 8, Cumulative 94.10%
Year 9, Cumulative 94.50%
Year 10, Cumulative 93.80%
Other specialty  
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance [Line Items]  
Year 1 19.90%
Year 2 16.90%
Year 3 12.10%
Year 4 12.60%
Year 5 8.70%
Year 6 5.50%
Year 7 3.40%
Year 8 2.90%
Year 9 2.80%
Year 10 0.00%
Year 1, Cumulative 19.90%
Year 2, Cumulative 36.80%
Year 3, Cumulative 48.90%
Year 4, Cumulative 61.50%
Year 5, Cumulative 70.20%
Year 6, Cumulative 75.70%
Year 7, Cumulative 79.10%
Year 8, Cumulative 82.00%
Year 9, Cumulative 84.80%
Year 10, Cumulative 84.80%