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Reinsurance and Indemnification - Schedule of Reinsurance and Indemnification Recoverables, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reinsurance Retention Policy [Line Items]        
Reinsurance and indemnification recoverables, net $ 8,924 $ 8,809    
Property and casualty        
Reinsurance Retention Policy [Line Items]        
Paid and due from reinsurers and indemnitors 285 254    
Unpaid losses estimated (including IBNR) 8,602 8,396 $ 9,176 $ 9,479
Reinsurance and indemnification recoverables, net 8,887 8,650    
Accident and health insurance        
Reinsurance Retention Policy [Line Items]        
Reinsurance and indemnification recoverables, net $ 37 $ 159