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COLLATERALIZED REINSURANCE AND TRUST AGREEMENTS - Summary of Collateralized Reinsurance Agreements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Effects of Reinsurance [Line Items]
Limit	$ 46	$ 32	$ 99	$ 82
Kilimanjaro Re Limited
Effects of Reinsurance [Line Items]
Limit			1,800
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2019-1 Class A-1
Effects of Reinsurance [Line Items]
Limit			150
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2019-1 Class A-2
Effects of Reinsurance [Line Items]
Limit			150
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2019-1 Class B-1
Effects of Reinsurance [Line Items]
Limit			275
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2019-1 Class B-2
Effects of Reinsurance [Line Items]
Limit			275
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class A-1
Effects of Reinsurance [Line Items]
Limit			150
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class A-2
Effects of Reinsurance [Line Items]
Limit			150
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class B-1
Effects of Reinsurance [Line Items]
Limit			85
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class B-2
Effects of Reinsurance [Line Items]
Limit			90
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class C-1
Effects of Reinsurance [Line Items]
Limit			85
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class C-2
Effects of Reinsurance [Line Items]
Limit			90
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2022-1 Class A
Effects of Reinsurance [Line Items]
Limit			$ 300

X

- Definition

Amount of written premiums ceded to other entities.

+ References

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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479655/944-605-50-1

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+ References

No definition available.

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