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Liability for Unpaid Losses and Loss Adjustment Expenses - Percentage Payout (Details)
Dec. 31, 2017
Rate
Property and Casualty, Personal Insurance Product Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 65.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 22.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 5.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 3.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 1.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine (0.40%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.00%
Other Short-duration Insurance Product Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 51.01%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 25.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 6.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 5.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 2.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 3.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 2.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 1.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine (1.30%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten (0.00%)
Property and Casualty, Commercial Insurance Product Line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 42.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 30.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 7.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 7.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 7.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 4.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 1.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine (0.10%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten (0.10%)