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Income Taxes (Deferred income tax assets and liabilities) (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deferred income tax assets:    
Tax loss carryforwards $ 908 $ 917
Tax credit carry forwards 311 269
Regulatory liabilities - cost of removal 195 206
Derivative instruments 145 90
Pension and post-retirement liabilities 84 126
Other 329 441
Total deferred income tax assets before valuation allowance 1,972 2,049
Valuation allowance (193) (163)
Total deferred income tax assets after valuation allowance 1,779 1,886
Deferred income tax (liabilities):    
Property, plant and equipment (2,382) (2,591)
Derivative instruments (148) (124)
Other (348) (316)
Total deferred income tax liabilities (2,878) (3,031)
Consolidated Balance Sheets presentation:    
Long-term deferred income tax assets 186 175
Long-term deferred income tax liabilities (1,285) (1,320)
Net deferred income tax liabilities $ (1,099) $ (1,145)