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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)

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