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ACQUISITION AND DISPOSITIONS - ACQUISITIONS, CHAPMAN AND OTHER (Details) CAD in Millions, $ in Millions |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
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Nov. 02, 2016 USD ($) | Nov. 02, 2016 CAD | Sep. 09, 2016 USD ($) MW | Sep. 09, 2016 CAD MW | Nov. 30, 2015 USD ($) MW | Nov. 30, 2015 CAD MW | Dec. 31, 2014 CAD | Oct. 31, 2014 CAD | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2015 CAD | Dec. 31, 2014 CAD | Nov. 02, 2016 CAD | Sep. 09, 2016 CAD | Nov. 30, 2015 CAD | Dec. 31, 2012 | Dec. 31, 2011
ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  | CAD 644 | CAD 106 | CAD 394 |  |  |  |  |
Chapman Ranch Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Wind project capacity | MW |  |  | 249 | 249 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 30 | CAD 40 | $ 50 | CAD 65 |  |  |  |  |  |  |  |  |  |  |  |  |
Portion allocated to property, plant and equipment | $ 17 |  | $ 48 |  |  |  |  |  |  |  |  |  | CAD 23 | CAD 62 |  |  |
Pro forma earnings before interest and income taxes | $ |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
New Creek Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  | 100.00% |  |
Wind project capacity | MW |  |  |  |  | 103 | 103 |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 36 | CAD 48 |  |  |  |  |  |  |  |  |  |  |
Portion allocated to property, plant and equipment |  |  |  |  | $ 26 |  |  |  |  |  |  |  |  |  | CAD 35 |  |
Massif du Sud Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  |  |  |  |  | 30.00% |  |  |  |  | 30.00% |  |  |  | 50.00% |
Cash consideration |  |  |  |  |  |  | CAD 102 |  |  |  |  |  |  |  |  |  |
Total ownership interest (as a percent) |  |  |  |  |  |  | 80.00% |  |  |  |  | 80.00% |  |  |  |  |
Portion allocated to property, plant and equipment |  |  |  |  |  |  | CAD 97 |  |  |  |  | CAD 97 |  |  |  |  |
Lac Alfred Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  |  |  |  |  |  | 17.50% |  |  |  |  |  |  |  |  | 50.00%
Cash consideration |  |  |  |  |  |  |  | CAD 121 |  |  |  |  |  |  |  |  |
Total ownership interest (as a percent) |  |  |  |  |  |  |  | 67.50% |  |  |  |  |  |  |  |  |
Portion allocated to property, plant and equipment |  |  |  |  |  |  |  | CAD 115 |  |  |  |  |  |  |  |  |

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- Definition The pro forma earnings before interest and income taxes for the period as if the business combination or combinations had been completed at the beginning of a period. + 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 Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 + Details
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