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Reinsurance and Indemnification - National Flood Insurance Program (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2025
Reinsurance Retention Policy [Line Items]
Property-liability insurance premiums earned	$ 2,681	$ 2,260	$ 2,036
National Flood Insurance Program
Reinsurance Retention Policy [Line Items]
Legislation to reauthorize				$ 22,500
Reserve Fund borrowing capacity	1,000
Reinsurance and indemnification recoverables, net	22	279
Property-liability insurance premiums earned	409	368	327
Ceded losses incurred	$ 111	$ 618	$ 102

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