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Long-Term Debt - Significant Long-Term Debt Issuances (Details) $ in Millions, $ in Millions | Dec. 31, 2024 USD ($) | Oct. 31, 2024 USD ($) | Sep. 30, 2024 CAD ($) | Aug. 31, 2024 USD ($) | Aug. 31, 2024 CAD ($) | May 31, 2024 USD ($) | May 31, 2024 CAD ($) | Apr. 30, 2024 USD ($) | Jan. 31, 2024 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Secured senior notes, 2034 maturity | Secured | ITC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 5.98%
Face value |  |  |  |  |  |  |  |  | $ 85
First mortgage bonds, 2029 maturity | Secured | ITC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 5.11%
Face value |  |  |  |  |  |  |  |  | $ 75
First mortgage bonds, 2034 maturity | Secured | ITC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 5.38%
Face value |  |  |  |  |  |  |  |  | $ 75
Unsecured Senior Notes, 2034 Maturity | Unsecured | ITC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 5.65% | 5.65% |  |
Face value | $ 400 |  |  |  |  | $ 400 |  |  |
First mortgage bonds, 2035 maturity | Secured | ITC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate | 4.88% |  |  |  |  |  |  |  |
Face value | $ 125 |  |  |  |  |  |  |  |
First mortgage bonds, 2043 maturity | Secured | ITC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate | 5.25% |  |  |  |  |  |  |  |
Face value | $ 125 |  |  |  |  |  |  |  |
Unsecured senior notes, 2036 maturity | Unsecured | UNS Energy |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 5.60% | 5.60% |  |
Face value |  |  |  |  |  | $ 30 |  |  |
Unsecured senior notes, 2034 maturity | Unsecured | UNS Energy |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.20% | 5.20% |  |  |  |
Face value |  |  |  | $ 400 |  |  |  |  |
Senior notes, 2031 maturity | Secured | Central Hudson |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 5.59% |
Face value |  |  |  |  |  |  |  | $ 25 |
Senior notes, 2034 maturity | Secured | Central Hudson |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 5.69% |
Face value |  |  |  |  |  |  |  | $ 35 |
Senior notes, 2029 maturity | Secured | Central Hudson |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.88% |  |  |  |  |  |  |
Face value |  | $ 25 |  |  |  |  |  |  |
Senior notes, 2034 maturity | Secured | Central Hudson |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 5.30% |  |  |  |  |  |  |
Face value |  | $ 44 |  |  |  |  |  |  |
Senior notes, 2036 maturity | Secured | Central Hudson |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  | 5.40% |  |  |  |  |  |  |
Face value |  | $ 35 |  |  |  |  |  |  |
Unsecured debentures, 2054 maturity | Unsecured | FortisBC Electric |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.92% | 4.92% |  |  |  |
Face value |  |  |  |  | $ 100 |  |  |  |
Unsecured debentures, 2054 maturity | Unsecured | FortisAlberta |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.90% | 4.90% |  |
Face value |  |  |  |  |  |  | $ 300 |  |
Unsecured senior notes, 2039 maturity | Unsecured | Caribbean Utilities |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 6.17% | 6.17% |  |
Face value |  |  |  |  |  | $ 40 |  |  |
Unsecured senior notes, 2049 maturity | Unsecured | Caribbean Utilities |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 6.37% | 6.37% |  |
Face value |  |  |  |  |  | $ 40 |  |  |
Unsecured senior notes, 2054 maturity | Unsecured | FortisOntario |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.05% | 5.05% |  |  |  |
Face value |  |  |  |  | $ 55 |  |  |  |
Unsecured senior notes, 2031 maturity | Unsecured | Fortis |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.17% |  |  |  |  |  |
Face value |  |  | $ 500 |  |  |  |  |  |

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