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Reinsurance and Indemnification - Schedule of Reinsurance and Indemnification Recoverables (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Reinsurance        
Reinsurance and indemnification recoverables, net $ 9,013 $ 8,809    
Property and casualty        
Reinsurance        
Paid and due from reinsurers and indemnitors 234 254    
Unpaid losses estimated (including IBNR) 8,728 8,396 $ 8,654 $ 9,176
Reinsurance and indemnification recoverables, net 8,962 8,650    
Accident and health insurance        
Reinsurance        
Reinsurance and indemnification recoverables, net $ 51 $ 159