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Intangible Assets - Schedule of Intangible Assets (Details) - CAD CAD in Millions	Dec. 31, 2016	Dec. 31, 2015
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

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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-Name Accounting Standards Codification
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