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Related Party Transactions - Schedule of Reinsurance (Details) - Related Party - North End Re (Cayman) SPC $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 USD ($) | Sep. 30, 2024 USD ($)
Related Party Transaction [Line Items] |  |
Total assets | $ 8,020 | $ 8,020
Total liabilities | 5,660 | 5,660
Effect of reinsurance agreement on net income (loss) | $ (138) | $ (216)

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