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Segmented Information - Significant Related Party and Inter-Company Transactions (Details) - CAD | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Aug. 31, 2015
Related Party Transaction [Line Items] |  |  |
Intercompany loans | CAD 0 | CAD 48,000,000 |
Intercompany interest expense, less than | CAD 1,000,000 | 17,000,000 |
Belize Electricity |  |  |
Related Party Transaction [Line Items] |  |  |
Equity investment ownership (percent) | 33.00% |  | 33.00%
Equity Method Investee | Belize Electricity |  |  |
Related Party Transaction [Line Items] |  |  |
Due from related party | CAD 16,000,000 | 5,000,000 |
Waneta Partnership |  |  |
Related Party Transaction [Line Items] |  |  |
Intercompany revenue recognized | 45,000,000 | 30,000,000 |
BECOL |  |  |
Related Party Transaction [Line Items] |  |  |
Intercompany revenue recognized | 33,000,000 | 30,000,000 |
Aitken Creek |  |  |
Related Party Transaction [Line Items] |  |  |
Intercompany revenue recognized | CAD 17,000,000 | CAD 0 |

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- Definition Intercompany Interest Expense + References No definition available. + Details
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- Definition Intercompany Loans + References No definition available. + Details
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- Definition The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(11)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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