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Reserve for Claims and Claim Expenses (Historical Claims Duration) (Details)
Dec. 31, 2020
Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout, year one 28.90%
Average annual percentage payout, year two 17.90%
Average annual percentage payout, year three 18.60%
Average annual percentage payout, year four 9.20%
Average annual percentage payout, year five 5.00%
Average annual percentage payout, year six 2.00%
Average annual percentage payout, year seven 1.40%
Average annual percentage payout, year eight 0.90%
Average annual percentage payout, year nine 0.50%
Average annual percentage payout, year ten 0.50%
Casualty and Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout, year one 14.00%
Average annual percentage payout, year two 17.80%
Average annual percentage payout, year three 13.40%
Average annual percentage payout, year four 12.00%
Average annual percentage payout, year five 9.20%
Average annual percentage payout, year six 7.70%
Average annual percentage payout, year seven 4.80%
Average annual percentage payout, year eight 3.90%
Average annual percentage payout, year nine 1.80%
Average annual percentage payout, year ten 1.50%