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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, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total operating revenues $ 7,588 $ 5,765
Interest expense, net 709 611
Other income, net (note 9) 145 93
Income tax expense (recovery) (185) 6
Net income 1,009 561
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net income 22 123
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 expense (recovery) (1) (2)
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 (2) (1)
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 25 126
Income tax expense (recovery) 1 2
Net income 24 124
Reclassification out of Accumulated Other Comprehensive Income [Member] | Actuarial losses (gains)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other income, net (note 9) 10 24
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 $ 15 $ 102