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Reinsurance and Indemnification - National flood insurance program (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2022
Reinsurance Retention Policy [Line Items]
Property-liability insurance premiums earned	$ 1,907	$ 1,982	$ 1,154
National Flood Insurance Program
Reinsurance Retention Policy [Line Items]
Legislation to reauthorize				$ 20,500
Reinsurance and indemnification recoverables, net	145	34
Property-liability insurance premiums earned	319	350	261
Reinsurance ceded amount	$ 435	$ 267	$ 87

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- Definition

Represents the amount of reinsurance ceded under various contracts.

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Reinsurance, Legislation to Reauthorize

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Amount of earned premiums ceded to other entities.

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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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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