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Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Gross deferred income tax assets    
Regulatory liabilities $ 636 $ 674
Tax loss and credit carryforwards 600 658
Employee future benefits 136 161
Other 144 160
Deferred tax assets, gross 1,516 1,653
Valuation allowance (23) (32)
Net deferred income tax asset 1,493 1,621
Gross deferred income tax liabilities    
PPE (5,355) (5,146)
Regulatory assets (372) (388)
Intangible assets (165) (147)
Deferred tax liabilities, gross (5,892) (5,681)
Net deferred income tax liability $ (4,399) $ (4,060)