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Income taxes - Tax Effect on Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - CAD
CAD in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Non-capital loss, investment tax credits, currently non-deductible interest expenses, and financing costs CAD 412,327 CAD 459,436
Pension and OPEB 54,744 57,751
Acquisition-related costs 2,008 3,612
Environmental obligation 18,570 25,683
Reserves and other non-deductible costs 38,453 11,390
Regulatory liabilities 193,942 76,315
Other 20,555 14,374
Total deferred income tax assets 740,599 648,561
Less valuation allowance (15,486) (21,656)
Total deferred tax assets 725,113 626,905
Deferred tax liabilities:    
Property, plant and equipment (838,110) (562,124)
Intangible assets (8,067) (8,035)
Outside basis in partnership (157,463) (187,717)
Regulatory accounts (143,090) (108,506)
Financial derivatives (1,230) (17,649)
Other 0 (1,008)
Total deferred tax liabilities (1,147,960) (885,039)
Net deferred tax liabilities (422,847) (258,134)
Deferred tax assets 76,972 30,005
Deferred tax liabilities CAD (499,819) CAD (288,139)