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Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Gross deferred income tax assets |  |
Regulatory liabilities | $ 659 | $ 636
Tax loss and credit carryforwards | 629 | 600
Employee future benefits | 123 | 136
Other | 216 | 144
Deferred tax assets, gross | 1,627 | 1,516
Valuation allowance | (50) | (23)
Net deferred income tax asset | 1,577 | 1,493
Gross deferred income tax liabilities |  |
PPE | (5,993) | (5,355)
Regulatory assets | (432) | (372)
Intangible assets | (172) | (165)
Deferred tax liabilities, gross | (6,597) | (5,892)
Net deferred income tax liability | $ (5,020) | $ (4,399)

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