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ACCOUNTS RECEIVABLE (Tables)
 12 Months Ended
Dec. 31, 2025
Receivables [Abstract]  
Summary of Accounts Receivable
As at December 31 (millions of dollars)
20252024
Accounts receivable - billed467 433 
Accounts receivable - unbilled673 539 
Accounts receivable, gross1,140 972 
Allowance for doubtful accounts(57)(61)
Accounts receivable, net1,083 911 
Summary of Allowance for Doubtful Accounts
The following table shows the movements in the allowance for doubtful accounts for the years ended December 31, 2025 and 2024:
As at December 31 (millions of dollars)
20252024
Allowance for doubtful accounts – beginning(61)(57)
Write-offs23 18 
Additions to allowance for doubtful accounts(19)(22)
Allowance for doubtful accounts – ending(57)(61)