Liability For Unpaid Claims And Claim Adjustment Expenses - Schedule of Claims Duration (Details)	Dec. 31, 2024
Liability
Claims Development [Line Items]
Year 1	30.60%
Year 2	27.50%
Year 3	14.20%
Year 4	9.80%
Year 5	6.50%
Year 6	3.50%
Year 7	2.20%
Year 8	1.40%
Year 9	0.90%
Year 10	3.40%
Property
Claims Development [Line Items]
Year 1	80.70%
Year 2	15.90%
Year 3	1.50%
Year 4	0.80%
Year 5	0.40%
Year 6	0.10%
Year 7	0.10%
Year 8	0.10%
Year 9	0.00%
Year 10	0.60%
Professional
Claims Development [Line Items]
Year 1	46.00%
Year 2	23.80%
Year 3	9.70%
Year 4	2.90%
Year 5	12.40%
Year 6	1.00%
Year 7	0.20%
Year 8	0.50%
Year 9	2.10%
Year 10	1.40%
Specialty
Claims Development [Line Items]
Year 1	76.30%
Year 2	23.20%
Year 3	0.20%
Year 4	0.00%
Year 5	0.00%
Year 6	0.00%
Year 7	0.00%
Year 8	0.00%
Year 9	0.00%
Year 10	0.20%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of average annual payout, after reinsurance, in the eighth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the fifth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the ninth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the first year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the seventh year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the tenth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the third year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the second year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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