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Significant Events - Restructured Poplar Creek Contract and Acquisition of Wind Farms (Details) CAD in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 01, 2015 CAD | Dec. 31, 2016 CAD MW | Dec. 31, 2017 CAD
Consideration transferred |  |  |
Finance lease receivables |  | CAD 778 | CAD 274
Poplar Creek |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Capacity of facility (in megawatts) | MW |  | 132 |
Number of turbines acquired | 2 |  |
Number of turbines retained | 2 |  |
Poplar Creek | Maximum |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Capacity of facility (in megawatts) | MW |  | 376 |
Wind Farms |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Number of wind farms acquired | 2 |  |
Assets |  |  |
Finance lease receivable | CAD 372 |  |
Property, plant, and equipment | 104 |  |
Intangibles | 37 |  |
Net working capital | 2 |  |
Total assets acquired | 515 |  |
Liabilities |  |  |
Decomissioning and restoration provision | 3 |  |
Net assets acquired | 512 |  |
Consideration transferred |  |  |
Property, plant, and equipment | 234 |  |
Net working capital | 27 |  |
Decommissioning and restoration provision | (11) |  |
Carrying amount of transferred net assets | 250 |  |
Gain recognised in bargain purchase transaction | CAD 262 |  |
Increase (decrease) in revenues |  | CAD 8 |
Increase (decrease) in earnings, before tax |  | CAD (2) |
Kent Breeze |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Capacity of facility (in megawatts) | MW |  | 20 |
Wintering Hills |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Capacity of facility (in megawatts) | MW |  | 88 |
Ownership interest (as a percent) |  | 51.00% |
2016 to 2018 | Wind Farms |  |  |
Consideration transferred |  |  |
Finance lease receivables |  | CAD 57 |
2019 to 2030 | Wind Farms |  |  |
Consideration transferred |  |  |
Finance lease receivables |  | CAD 20 |
Finance lease receivables | Wind Farms |  |  |
Consideration transferred |  |  |
Discount rate |  | 2.68% |
Suncor Energy | Poplar Creek |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Capacity of facility (in megawatts) | MW |  | 244 |

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