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Reserve for Claims and Claim Expenses (Historical Claims Duration) (Details)
Dec. 31, 2016
Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout, year one 26.50%
Average annual percentage payout, year two 23.70%
Average annual percentage payout, year three 20.90%
Average annual percentage payout, year four 10.20%
Average annual percentage payout, year five 5.00%
Average annual percentage payout, year six 2.90%
Average annual percentage payout, year seven 5.30%
Average annual percentage payout, year eight 0.30%
Average annual percentage payout, year nine 0.30%
Average annual percentage payout, year ten 0.60%
Casualty and Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout, year one 10.20%
Average annual percentage payout, year two 19.30%
Average annual percentage payout, year three 11.10%
Average annual percentage payout, year four 10.60%
Average annual percentage payout, year five 8.80%
Average annual percentage payout, year six 8.10%
Average annual percentage payout, year seven 4.50%
Average annual percentage payout, year eight 3.70%
Average annual percentage payout, year nine 3.40%
Average annual percentage payout, year ten 4.30%