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Nature of Regulation - FortisBC Energy and FortisBC Electric (Details) - BCUC |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2016 | Jan. 01, 2013 | Dec. 31, 2016
FortisBC Energy and FortisBC Electric |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Variance sharing (percent) |  |  | 50.00%
FortisBC Energy |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
ROE (percent) | 8.75% | 8.75% |
Capital structure of common equity (percent) | 38.50% | 38.50% |
Fixed productivity adjustment (percent) |  |  | 1.10%
FortisBC Electric |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
ROE (percent) | 9.15% | 9.15% |
Capital structure of common equity (percent) | 40.00% | 40.00% |
Fixed productivity adjustment (percent) |  |  | 1.03%

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