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Collateralized Reinsurance And Trust Agreements (Premiums And Losses Ceded By The Company To Affiliate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 1,608	$ 1,604	$ 1,365
Assumed written premiums	9,350	9,062	7,264
Mt Logan Re [Member]
Effects of Reinsurance [Line Items]
Ceded written premiums	201	341	303
Ceded earned premiums	206	333	306
Ceded losses and LAE	191	282	241
Assumed written premiums	5	12	19
Assumed earned premiums	$ 5	$ 12	$ 19

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- Definition

Assumed earned premiums

+ References

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- Definition

Ceded earned premiums

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- Definition

Ceded Losses And Loss Adjustment Expenses

+ References

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- Definition

Amount of written premiums assumed from other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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- Definition

Amount of written premiums ceded to other entities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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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.

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