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Accounts Receivable and Other Current Assets - Schedule of Accounts Receivable and Other Current Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Receivables [Abstract]      
Trade accounts receivable $ 1,009 $ 890  
Unbilled accounts receivable 738 727  
Allowance for credit losses (78) (68) $ (58)
Total accounts receivable 1,669 1,549  
Income tax receivable 0 78  
Other 217 191  
Accounts receivable and other current assets $ 1,886 $ 1,818