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COLLATERALIZED REINSURANCE AND TRUST AGREEMENTS - Premiums and Losses Ceded to Affiliate (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Collateralized Reinsurance And Trust Agreements [Abstract] |  |
Ceded written premiums | $ 53 | $ 50
Ceded earned premiums | 46 | 50
Ceded losses and LAE | 36 | 41
Assumed written premiums | 1 | 1
Assumed earned premiums | 1 | 1
Assumed losses and LAE | $ 0 | $ 0

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- Definition Assumed Earned Premiums + References No definition available. + Details
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- Definition Assumed Losses And Loss Adjustment Expenses + References No definition available. + Details
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- Definition Ceded Earned Premiums + References No definition available. + Details
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- Definition Ceded Losses And Loss Adjustment Expenses + References No definition available. + Details
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- Definition Collateralized Reinsurance And Trust Agreements[Abstract] + References No definition available. + Details
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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 + Details
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