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Income Taxes - Schedule of Deferred Income Taxes (Details) - CAD
CAD in Millions
Dec. 31, 2016
Dec. 31, 2015
Gross deferred income tax assets    
Tax loss and credit carryforwards CAD 675 CAD 387
Regulatory liabilities 292 210
Employee future benefits 155 116
Fair value of long-term debt adjustment 88 0
Unrealized foreign exchange losses on long-term debt 56 65
Other 57 58
Deferred tax assets, gross 1,323 836
Deferred income tax assets valuation allowance (56) (73)
Net deferred income tax assets 1,267 763
Gross deferred income tax liabilities    
Utility capital assets (4,213) (2,575)
Regulatory assets (242) (201)
Intangible assets (75) (37)
Deferred tax liabilities, gross (4,530) (2,813)
Net deferred income tax liability (3,263) (2,050)
Unrealized Foreign Exchange Losses on Long-Term Debt    
Gross deferred income tax assets    
Deferred income tax assets valuation allowance CAD (56) CAD (65)