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Significant Events - U.S. Solar and Wind Acquisition (Details) CAD in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2015 CAD MW | Sep. 01, 2015 CAD MW | Dec. 31, 2016 | Dec. 31, 2015 CAD
U.S. Solar and Wind |  |  |  |
Assets |  |  |  |
Property, plant, and equipment | CAD 217 |  |  |
Inventory (SREC-I) | 10 |  |  |
Net working capital | 6 |  |  |
Total assets acquired | 233 |  |  |
Liabilities |  |  |  |
Non-recourse debt | 55 |  |  |
Tax equity liability | 50 |  |  |
Deferred tax liabilities | 18 |  |  |
Decomissioning and restoration provision | 4 |  |  |
Total liabilities assumed | 127 |  |  |
Total consideration transferred | CAD 106 |  |  |
Increase (decrease) in revenues |  |  |  | CAD 14
Increase (decrease) in earnings, before tax |  |  |  | CAD (6)
Odin Power |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Ownership interest (as a percent) | 10000.00% |  |  |
Capacity of facility (in megawatts) | MW | 50 |  |  |
Liabilities |  |  |  |
Total consideration transferred | CAD 49 |  |  |
RC Solar |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Ownership interest (as a percent) |  | 10000.00% |  |
Capacity of facility (in megawatts) | MW |  | 21 |  |
Liabilities |  |  |  |
Total consideration transferred |  | CAD 55 |  |
RC Solar | Minimum |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Term of power purchase arrangement |  |  | 20 years |
RC Solar | Maximum |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Term of power purchase arrangement |  |  | 30 years |

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