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Reserve for Claims and Claim Expenses (Historical Claims Duration) (Details)
Dec. 31, 2021
Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout, year one 29.20%
Average annual percentage payout, year two 19.40%
Average annual percentage payout, year three 15.70%
Average annual percentage payout, year four 6.80%
Average annual percentage payout, year five 3.00%
Average annual percentage payout, year six 2.30%
Average annual percentage payout, year seven 0.60%
Average annual percentage payout, year eight 1.60%
Average annual percentage payout, year nine 0.10%
Average annual percentage payout, year ten 1.10%
Casualty and Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout, year one 12.40%
Average annual percentage payout, year two 17.00%
Average annual percentage payout, year three 12.80%
Average annual percentage payout, year four 14.20%
Average annual percentage payout, year five 9.80%
Average annual percentage payout, year six 8.10%
Average annual percentage payout, year seven 5.00%
Average annual percentage payout, year eight 3.20%
Average annual percentage payout, year nine 2.10%
Average annual percentage payout, year ten 2.20%