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Accumulated Other Comprehensive Income (Loss) (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total operating revenues $ 5,506   $ 6,111  
Other income net (note 9) 708   12  
Operating, maintenance and general 1,419   1,464  
Income tax expense (recovery) 341   61  
Net income 984   710  
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income 1   77  
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]        
Total operating revenues 2   3  
Total before tax 2   3  
Net income 2   3  
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]        
Pension and post-retirement benefits (16)   39  
Regulatory assets   $ 0   $ 28
Total before tax (2)   83  
Income tax expense (recovery) 1   (9)  
Net income $ (1)   $ 74  
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)   15   17
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)   $ (1)   $ (1)