v3.25.0.1
Accounts Receivable and Other Current Assets
 12 Months Ended
Dec. 31, 2024
Receivables [Abstract]  
Accounts Receivable and Other Current Assets ACCOUNTS RECEIVABLE AND OTHER CURRENT ASSETS
($ millions)2024 2023 
Trade accounts receivable1,009 890 
Unbilled accounts receivable738 727 
Allowance for credit losses(78)(68)
1,669 1,549 
Income tax receivable— 78 
Other (1)
217 191 
1,886 1,818 
(1)    Consists mainly of customer billings for non-core services, gas mitigation costs and collateral deposits for gas purchases, and the fair value of derivative instruments (Note 26)

Allowance for Credit Losses
The allowance for credit losses changed as follows.

($ millions)2024 2023 
Balance, beginning of year(68)(58)
Credit loss expensed(30)(33)
Credit loss deferral(31)(13)
Write-offs, net of recoveries55 35 
Foreign exchange(4)1 
Balance, end of year(78)(68)

See Note 26 for disclosure on the Corporation's credit risk.