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Reinsurance and Indemnification - North Carolina Reinsurance Facility (Narrative) (Details) - North Carolina Reinsurance Facility - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Reinsurance Retention Policy [Line Items]    
Funds surplus in member's equity   $ 52
Paid and due from reinsurers and indemnitors $ 97  
Recoverables $ 359