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Transactions With Related Parties (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Net premiums written	$ 3,428	$ 2,685	$ 6,852	$ 5,319
Net premiums earned	2,965	2,326	5,848	4,447
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	6,717	$ 5,939	6,717	5,939	$ 6,612	$ 6,564	$ 5,941	$ 5,881
Reinsurance balances payable	2,191		2,191			1,530
Operating affiliates | Somers Holdings Ltd
Related Party Transaction [Line Items]
Net premiums written			314	$ 347
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	1,300		1,300			1,200
Reinsurance balances payable	485		485			414
Equity Method Investee | Premia Holdings Ltd
Related Party Transaction [Line Items]
Net premiums written			75
Net premiums earned			75
Funds held asset	$ 191		$ 191			$ 119

X

- Definition

Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

+ References

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

+ References

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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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