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Comparative Figures (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Other income (expenses), net | CAD 53 | CAD 197
Operating expenses | 2,031 | 1,874
Revenue | 6,838 | 6,757
Energy supply costs | 2,341 | 2,591
Inter-segment eliminations |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Other income (expenses), net | (1) | (1)
Operating expenses | (12) | (12)
Revenue | (13) | (31)
Energy supply costs | CAD (1) | (1)
Previously reported | Inter-segment eliminations |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Revenue |  | 30
Energy supply costs |  | 30
Acquisition Related Costs Reclassification | Restatement adjustment |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Other income (expenses), net |  | 10
Operating expenses |  | 10
Related Party Revenue Previously Eliminated | Restatement adjustment |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Revenue |  | 30
Energy supply costs |  | CAD 30

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