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Income Taxes (Deferred income tax assets and liabilities) (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred income tax assets:    
Tax loss carryforwards $ 1,207 $ 873
Tax credit carryforwards 415 375
Regulatory liabilities - cost of removal 177 170
Derivative instruments 45 188
Other 428 434
Total deferred income tax assets before valuation allowance 2,272 2,040
Valuation allowance (312) (256)
Total deferred income tax assets after valuation allowance 1,960 1,784
Deferred income tax (liabilities):    
Property, plant and equipment (2,981) (2,622)
Regulatory assets (219) (78)
Derivative instruments (125) (197)
Other (594) (460)
Total deferred income tax liabilities (3,919) (3,357)
Consolidated Balance Sheets presentation:    
Long-term deferred income tax assets 237 295
Long-term deferred income tax liabilities (2,196) (1,868)
Net deferred income tax liabilities $ (1,959) $ (1,573)