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Capital Lease and Finance Obligations - FortisBC Electric (Details) - FortisBC Electric - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Brilliant Plant |  |
Capital Leased Assets [Line Items] |  |
Concentration purchased output percentage | 94.00% |
Capital lease costs recognized in energy supply costs and operating expenses | CAD 27 | CAD 26
BTS |  |
Capital Leased Assets [Line Items] |  |
Capital lease costs recognized in energy supply costs and operating expenses | CAD 3 | CAD 3
Capital Leases | Brilliant Plant |  |
Capital Leased Assets [Line Items] |  |
Stated interest rate (percent) | 5.00% |
Capital Leases | BTS |  |
Capital Leased Assets [Line Items] |  |
Stated interest rate (percent) | 9.00% |

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