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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (PARENTHETICAL) - Related Party - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Monarch Point Re | Loan With Monarch Point Re |  |
Non-cash repayment of advance | $ 71 | $ 48
Interest received on advance | 5 | 6
Monarch Point Re | Retrocession Agreement With Monarch Point Re |  |
Reinsurance premiums | 62 | 46
Ceded losses and loss expenses | $ 14 | 4
Third Party Reinsurer | Loan Agreement With Third Party Reinsurer |  |
Non-cash repayment of advance |  | 25
Third Party Reinsurer | Retrocession Agreement with Third Party Reinsurer |  |
Reinsurance premiums |  | $ 25

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