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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)

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