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Income Taxes (Deferred income tax assets and liabilities) (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred income tax assets:    
Tax loss carryforwards $ 724 $ 908
Tax credit carryforwards 319 311
Regulatory liabilities - cost of removal 184 195
Derivative instruments 108 145
Other 375 413
Total deferred income tax assets before valuation allowance 1,710 1,972
Total deferred income tax assets after valuation allowance 1,508 1,779
Deferred income tax (liabilities):    
Property, plant and equipment (2,450) (2,382)
Derivative instruments (93) (148)
Other (385) (348)
Total deferred income tax liabilities (2,928) (2,878)
Consolidated Balance Sheets presentation:    
Long-term deferred income tax assets 209 186
Long-term deferred income tax liabilities (1,629) (1,285)
Net deferred income tax liabilities $ (1,420) $ (1,099)