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Basis of Reporting and Accounting - Reporting and Accounting Policies - Allowance for Credit Loss (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Premium Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses, beginning of period $ 501 $ 328 $ 460 $ 369
Increase in allowance 211 167 540 402
Write-offs (196) (107) (484) (383)
Allowance for credit losses, end of period $ 516 $ 388 $ 516 $ 388