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Reinsurance and Indemnification - Schedule of Reinsurance and Indemnification Recoverables (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Reinsurance        
Reinsurance and indemnification recoverables, net $ 10,091 $ 8,924    
Property and casualty        
Reinsurance        
Paid and due from reinsurers and indemnitors 352 285    
Unpaid losses estimated (including IBNR) 9,739 8,602 $ 8,333 $ 8,396
Reinsurance and indemnification recoverables, net 10,091 8,887    
Accident and health insurance        
Reinsurance        
Reinsurance and indemnification recoverables, net $ 0 $ 37