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Commitments, Guarantees and Contingent Liabilities - Guaranty funds and Guarantees (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Minimum
Loss Contingencies
Reasonably possible additional losses	$ 0
Maximum
Loss Contingencies
Reasonably possible additional losses	153,000,000
Guaranty Funds
Loss Contingencies
Liability for insurance assessments	$ 12,000,000	$ 13,000,000

X

- Definition

Estimate of the reasonably possible pretax loss exposure in excess of the amount accrued for the entity's lawsuits, regulatory inquiries and other legal proceedings.

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- Definition

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.

+ References

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The liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations.

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