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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
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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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