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Long-Term Debt - Narrative (Details) CAD in Millions, $ in Millions | 1 Months Ended | 5 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 CAD | Oct. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Aug. 31, 2016 CAD | Jul. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | Apr. 30, 2016 CAD | Sep. 30, 2016 USD ($) | Sep. 30, 2016 CAD | May 31, 2016 USD ($)
REGULATED | ITC | Unsecured | 6.00% Unsecured US Shareholder Note |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | $ 199.0 |  |  |  |  |  |  |  |
Debt term |  | 12 years |  |  |  |  |  |  |  |
Stated interest rate (percent) | 6.00% | 6.00% |  |  |  |  |  |  |  |
REGULATED | FortisBC Energy | Unsecured | 2.58% and 3.67% Unsecured Debentures |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value | CAD |  |  |  |  |  |  | CAD 300 |  |  |
REGULATED | FortisBC Energy | Unsecured | 2.58% Unsecured Debentures |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value | CAD |  |  |  |  |  |  | CAD 150 |  |  |
Debt term |  |  |  |  |  |  | 10 years |  |  |
Stated interest rate (percent) |  |  |  |  |  |  | 2.58% |  |  |
REGULATED | FortisBC Energy | Unsecured | 3.67% Unsecured Debentures |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value | CAD |  |  |  |  |  |  | CAD 150 |  |  |
Debt term |  |  |  |  |  |  | 30 years |  |  |
Stated interest rate (percent) |  |  |  |  |  |  | 3.67% |  |  |
REGULATED | FortisBC Energy | Unsecured | 3.78% Unsecured Debentures |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value | CAD | CAD 150 |  |  |  |  |  |  |  |  |
Debt term | 30 years |  |  |  |  |  |  |  |  |
Stated interest rate (percent) | 3.78% |  |  |  |  |  |  |  |  |
REGULATED | Fortis Turks and Caicos | Unsecured | 5.14% and 5.29% Unsecured Debentures |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  |  | $ 45.0 |  |  |  |  | $ 45.0 |  |
Debt term |  |  |  |  |  |  |  | 15 years |  |
REGULATED | Fortis Turks and Caicos | Unsecured | 5.14% Unsecured Debentures |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  |  |  |  |  |  |  |  |  | $ 22.5
Stated interest rate (percent) |  |  |  |  |  |  |  |  |  | 5.14%
REGULATED | Fortis Turks and Caicos | Unsecured | 5.29% Unsecured Debentures |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  |  | $ 22.5 |  |  |  |  | $ 22.5 |  |
Stated interest rate (percent) |  |  | 5.29% |  |  |  |  | 5.29% | 5.29% |
REGULATED | Fortis Turks and Caicos | Unsecured | 5.14% Unsecured Bonds |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  |  |  |  | $ 5.0 |  |  |  |  |
Debt term |  |  |  |  | 15 years |  |  |  |  |
Stated interest rate (percent) |  |  |  |  | 5.14% |  |  |  |  |
REGULATED | Central Hudson | Unsecured | 2.16% Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  |  |  |  |  | $ 24.0 |  |  |  |
Debt term |  |  |  |  |  | 4 years |  |  |  |
Stated interest rate (percent) |  |  |  |  |  | 2.16% |  |  |  |
REGULATED | Central Hudson | Unsecured | 2.65 % and 3.63% Unsecured US Promissory Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | $ 30.0 |  |  |  |  |  |  |  |
REGULATED | Central Hudson | Unsecured | 2.56% Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | $ 10.0 |  |  |  |  |  |  |  |
Debt term |  | 10 years |  |  |  |  |  |  |  |
Stated interest rate (percent) |  | 2.56% |  |  |  |  |  |  |  |
REGULATED | Central Hudson | Unsecured | 3.63% Unsecured Debentures |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | $ 20.0 |  |  |  |  |  |  |  |
Debt term |  | 30 years |  |  |  |  |  |  |  |
Stated interest rate (percent) |  | 3.63% |  |  |  |  |  |  |  |
REGULATED | FortisAlberta | Unsecured | 3.34% Unsecured Debentures |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value | CAD |  |  |  |  |  |  |  |  | CAD 150 |
Debt term |  |  | 30 years |  |  |  |  |  |  |
Stated interest rate (percent) |  |  | 3.34% |  |  |  |  | 3.34% | 3.34% |
REGULATED | Maritime Electric | Secured | 3.657% Secured First Mortgage Bonds |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value | CAD |  |  |  | CAD 40 |  |  |  |  |  |
Debt term |  |  |  | 40 years |  |  |  |  |  |
Stated interest rate (percent) |  |  |  | 3.66% |  |  |  |  |  |
NON-REGULATED | Corporate | Unsecured | 2.100% Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | $ 500.0 |  |  |  |  |  |  |  |
Debt term |  | 5 years |  |  |  |  |  |  |  |
Stated interest rate (percent) |  | 2.10% |  |  |  |  |  |  |  |
NON-REGULATED | Corporate | Unsecured | 3.055% Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value |  | $ 1,500.0 |  |  |  |  |  |  |  |
Debt term |  | 10 years |  |  |  |  |  |  |  |
Stated interest rate (percent) |  | 3.06% |  |  |  |  |  |  |  |
NON-REGULATED | Corporate | Unsecured | 2.85% Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face value | CAD | CAD 500 |  |  |  |  |  |  |  |  |
Debt term | 7 years |  |  |  |  |  |  |  |  |
Stated interest rate (percent) | 2.85% |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt to capital restriction on issuance of new debt (percent) | 0.7 |  |  |  |  |  |  |  |  |
Debt to capital restriction on dividends (percent) | 0.75 |  |  |  |  |  |  |  |  |

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