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Intangible Assets - Schedule of Intangible Assets (Details) - CAD CAD in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Finite-Lived and Indefinite Lived Intangible Assets [Line Items] |  |
Cost | CAD 1,622 | CAD 1,066
Accumulated Amortization | (611) | (525)
Net Book Value | 1,011 | 541
Land, transmission and water rights |  |
Finite-Lived and Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 700 | 328
Accumulated Amortization | (108) | (76)
Net Book Value | 592 | 252
Assets under construction |  |
Finite-Lived and Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 46 | 36
Accumulated Amortization | 0 | 0
Net Book Value | 46 | 36
Computer software |  |
Finite-Lived and Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 748 | 685
Accumulated Amortization | (447) | (436)
Net Book Value | 301 | 249
Other |  |
Finite-Lived and Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 128 | 17
Accumulated Amortization | (56) | (13)
Net Book Value | CAD 72 | CAD 4

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