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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)