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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, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total operating revenues $ 6,111 $ 6,524
Other income (expenses), net 12 (23)
Retained earnings 1,173 1,075
Operating, maintenance and general 1,464 1,580
Regulatory Assets 1,552 1,569
Income tax expense (recovery) 61 69
Net income 710 747
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net income 77 (1)
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]    
Fuel for generation and purchased power (notes 16 and 18) 0 (1)
Total operating revenues 3 (5)
Total before tax 3 (6)
Net income 3 (6)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net change in available-for-sale investments    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Retained earnings 0 (4)
Total before tax 0 (4)
Net income 0 (4)
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 83 7
Income tax expense (recovery) (9) 2
Net income 74 9
Reclassification out of Accumulated Other Comprehensive Income [Member] | Actuarial losses (gains)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Operating, maintenance and general 17 25
Reclassification out of Accumulated Other Comprehensive Income [Member] | Past service costs (gains)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Operating, maintenance and general (1) (1)
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 39 (17)
Regulatory Assets $ 28 $ 0