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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

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