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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 1,907	$ 1,608	$ 1,604
Assumed written premiums	11,606	9,350	9,062
Mt Logan Re
Effects of Reinsurance [Line Items]
Ceded written premiums	246	201	341
Ceded earned premiums	242	206	333
Ceded losses and LAE	64	191	282
Assumed written premiums	6	5	12
Assumed earned premiums	$ 6	$ 5	$ 12

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- Definition

Assumed Earned Premiums

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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//1943274/2147479655/944-605-50-1

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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//1943274/2147479655/944-605-50-1

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-Section 50
-Paragraph 1
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