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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS - Schedule of Premiums and Losses Ceded (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 2,418	$ 1,907	$ 1,608
Assumed written premiums	13,117	11,606	9,350
Mt Logan Re
Effects of Reinsurance [Line Items]
Ceded written premiums	433	246	201
Ceded earned premiums	376	242	206
Ceded losses and LAE	188	64	191
Assumed written premiums	10	6	5
Assumed earned premiums	$ 10	$ 6	$ 5

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- Definition

Assumed Earned Premiums

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- Definition

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- Definition

Ceded Losses And Loss Adjustment Expenses

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- Definition

Amount of written premiums assumed from other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479032/944-605-50-1

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Amount of written premiums ceded to other entities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479032/944-605-50-1

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-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479032/944-605-50-1

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