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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

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- 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. + Details
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- 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 + Details
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