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Liability for Unpaid Claims and Claim Adjustment Expenses - Summary of Average Annual Percentage Payout Incurred Claims (Detail)
Dec. 31, 2019
Credit Property and Casualty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 77.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 22.10%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year six 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year eight 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year nine 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year ten 0.00%
Auto Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 33.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 28.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 15.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 10.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 5.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year six 2.20%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 1.30%
Average annual percentage payout of incurred claims by age, net of reinsurance year eight 0.30%
Average annual percentage payout of incurred claims by age, net of reinsurance year nine 0.20%
Average annual percentage payout of incurred claims by age, net of reinsurance year ten 1.80%
Non-Auto Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 18.30%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 20.40%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 16.50%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 14.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 8.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year six 5.10%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 2.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year eight 1.60%
Average annual percentage payout of incurred claims by age, net of reinsurance year nine 0.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year ten 10.80%
Homeowners  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 73.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 20.10%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 2.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 1.50%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 0.30%
Average annual percentage payout of incurred claims by age, net of reinsurance year six 0.20%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance year eight 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year nine 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year ten 1.20%
Commercial Multi-Peril  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 37.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 15.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 9.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 13.20%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 9.30%
Average annual percentage payout of incurred claims by age, net of reinsurance year six 5.80%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 4.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year eight 0.50%
Average annual percentage payout of incurred claims by age, net of reinsurance year nine 0.40%
Average annual percentage payout of incurred claims by age, net of reinsurance year ten 4.40%
Short Tail Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 88.90%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 11.10%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year six 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year eight 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year nine 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year ten 0.00%
Credit Life  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Average annual percentage payout of incurred claims by age, net of reinsurance year one 78.70%
Average annual percentage payout of incurred claims by age, net of reinsurance year two 21.30%
Average annual percentage payout of incurred claims by age, net of reinsurance year three 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year four 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year five 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year six 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year seven 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year eight 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year nine 0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance year ten 0.00%