v3.25.2
Basis of Reporting and Accounting (Tables)
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
(millions)2025202420252024
Allowance for credit losses, beginning of period$473 $328 $460 $369 
Increase in allowance1
176 128 329 235 
Write-offs2
(148)(128)(288)(276)
Allowance for credit losses, end of period$501 $328 $501 $328 
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.