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Dispositions - Non-Regulated Generation Assets (Details) CAD in Millions, $ in Millions	1 Months Ended			12 Months Ended
	Jul. 31, 2015 CAD	Jun. 30, 2015 USD ($)	Jun. 30, 2015 CAD	Dec. 31, 2016 CAD	Dec. 31, 2015 CAD
Long Lived Assets Held-for-sale [Line Items]
Gain (loss) on sale of non-regulated generation assets, net of expenses				CAD 0	CAD 56
Upstate New York, Non-Regulated Generating Assets
Long Lived Assets Held-for-sale [Line Items]
Proceeds from the sale of non-regulated generation assets		$ 63	CAD 77
Gain (loss) on sale of non-regulated generation assets, net of expenses		41	51
Gain (loss) on sale of non-regulated generation assets, net of expense and tax		$ 22	CAD 27
Ontario, Non-Regulated Generating Assets [Member]
Long Lived Assets Held-for-sale [Line Items]
Proceeds from the sale of non-regulated generation assets	CAD 16
Gain (loss) on sale of non-regulated generation assets, net of expenses	5
Gain (loss) on sale of non-regulated generation assets, net of expense and tax	CAD 5
New York and Ontario, Non-Regulated Generating Assets
Long Lived Assets Held-for-sale [Line Items]
Earnings before taxes related to disposal, excluding gain of sale					CAD 1

X

- Definition

Gain (Loss) on Disposition of Property Plant and Equipment, Net of Expense

+ References

No definition available.

+ Details

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- Definition

Gain (Loss) on Disposition of Property Plant and Equipment, Net of Expense and Tax

+ References

No definition available.

+ Details

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- Definition

Income (Loss) before Tax, related to disposals, excluding Net Gain on Sale

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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X

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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