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Basis of Reporting and Accounting (Tables)
 9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Premium Receivable, Allowance for Credit Loss The following table summarizes changes in our allowance for credit loss exposure on our premiums receivable:
Three Months Ended September 30,Nine Months Ended September 30,
(millions)2025202420252024
Allowance for credit losses, beginning of period$501 $328 $460 $369 
Increase in allowance1
211 167 540 402 
Write-offs2
(196)(107)(484)(383)
Allowance for credit losses, end of period$516 $388 $516 $388 
1 Represents the incremental increase in other underwriting expenses.
2 Represents the portion of allowance that is reversed when the premiums receivable balances are written off. Premiums receivable balances are written off once we have exhausted our collection efforts.