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COLLATERALIZED REINSURANCE AND TRUST AGREEMENTS - Premiums and Losses Ceded to Affiliate (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Collateralized Reinsurance And Trust Agreements [Abstract] |  |  |  |
Ceded written premiums | $ 89 | $ 68 | $ 187 | $ 150
Ceded earned premiums | 74 | 57 | 172 | 149
Ceded losses and LAE | 26 | 99 | 79 | 161
Assumed written premiums | 2 | 2 | 3 | 3
Assumed earned premiums | 2 | 2 | 3 | 3
Assumed losses and LAE | $ 0 | $ 0 | $ 0 | $ 0

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