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Reinsurance (Reinsurance Recoverable on Ceded Reinsurance) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Reinsurance Disclosures [Abstract]        
Reinsurance recoverable on unpaid losses and loss expenses [1] $ 18,421 $ 17,734 $ 17,631 $ 17,884
Reinsurance recoverable on paid losses and loss expenses [1] 1,806 2,043    
Reinsurance recoverable on losses and loss expenses [1] 20,227 19,777    
Reinsurance Recoverables on Unpaid Losses, Allowance 265 242    
Reinsurance Recoverables on Paid Losses, Allowance 61 68    
Reinsurance Recoverable, Allowance for Credit Loss, Total 326 310 $ 388 $ 367
Reinsurance recoverable on policy benefits [1] 302 289    
Reinsurance Recoverables on Future Policy Benefits, Allowance $ 0 $ 0    
[1] Net of valuation allowance for uncollectible reinsurance.