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Reinsurance (Reinsurance Recoverable on Ceded Reinsurance) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Reinsurance Disclosures [Abstract]        
Reinsurance recoverable on unpaid losses and loss expenses [1] $ 17,409 $ 17,884 $ 16,608 $ 17,086
Reinsurance recoverable on paid losses and loss expenses [1] 1,946 2,068    
Reinsurance recoverable on losses and loss expenses [1] 19,355 19,952    
Reinsurance recoverable on policy benefits [1] 291 280    
Reinsurance Recoverables on Unpaid Losses, Allowance 299 285    
Reinsurance Recoverables on Paid Losses, Allowance 82 82    
Reinsurance Recoverable, Allowance for Credit Loss, Total 381 367 $ 361 $ 351
Reinsurance Recoverables on Future Policy Benefits, Allowance $ 0 $ 0    
[1] Net of valuation allowance for uncollectible reinsurance.