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Accumulated Other Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Income (Loss)) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total operating revenues $ 7,200 $ 7,563
Interest expense, net (note 9) (973) (925)
Other income, net (note 9) 203 158
Income tax recovery (expense) 159 (128)
Net income 568 1,045
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net income 66 (41)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Losses (gain) on derivatives recognized as cash flow hedges    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax recovery (expense) 0 (1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Losses (gain) on derivatives recognized as cash flow hedges | Interest rate hedge    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Interest expense, net (note 9) (2) (2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net change in unrecognized pension and post-retirement benefit costs    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax 68 (38)
Income tax recovery (expense) 0 1
Net income 68 (39)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Actuarial (gains) losses    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other income, net (note 9) 2 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Past service costs (gains)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other income, net (note 9) (2) 2
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amounts reclassified into obligations    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Pension and post-retirement benefits $ 68 $ (40)