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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Effects of Reinsurance [Line Items] |  |  |
Ceded written premiums | $ 2,418 | $ 1,907 | $ 1,608
Assumed written premiums | 13,117 | 11,606 | 9,350
Mt Logan Re |  |  |
Effects of Reinsurance [Line Items] |  |  |
Ceded written premiums | 433 | 246 | 201
Ceded earned premiums | 376 | 242 | 206
Ceded losses and LAE | 188 | 64 | 191
Assumed written premiums | 10 | 6 | 5
Assumed earned premiums | $ 10 | $ 6 | $ 5

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