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COLLATERALIZED REINSURANCE AND TRUST AGREEMENTS - Summary of Collateralized Reinsurance Agreements (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Effects of Reinsurance [Line Items] |  |
Limit | $ 53 | $ 50
Kilimanjaro Re Limited |  |
Effects of Reinsurance [Line Items] |  |
Limit | 2,063 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2018-1 Class A-2 |  |
Effects of Reinsurance [Line Items] |  |
Limit | 63 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2018-1 Class B-2 |  |
Effects of Reinsurance [Line Items] |  |
Limit | 200 |
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 |

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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 + Details
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