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Long-Term Debt - Narrative (Details) $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Aug. 31, 2024 CAD ($) | Jul. 31, 2024 CAD ($) | Jun. 30, 2024 CAD ($) | May 31, 2024 CAD ($) | May 31, 2024 USD ($) | Apr. 30, 2024 CAD ($) | Mar. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-form base shelf prospectus, life | 25 months |  |  |  |  |  |  |  |  |  |
Short-form base shelf prospectus, principal amount, up to | $ 2,000 | $ 2,000 |  |  |  |  |  |  |  |  |
ATM Program, principal amount, maximum | 500 | 500 |  |  |  |  |  |  |  |  |
ATM Program, remaining amount available | 500 | 500 |  |  |  |  |  |  |  |  |
Short-form base shelf prospectus, remaining amount available | 1,500 | 1,500 |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 6,342 | 6,342 |  |  |  |  |  |  |  |  | $ 6,176
Unsecured committed revolving credit facilities | FortisBC Energy |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 900 | $ 700 |
Unsecured committed revolving credit facilities | FortisBC Electric |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 200 |  | $ 150 |  |
Unsecured committed revolving credit facilities | Fortis |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 1,300 |  |  |  |  |
Unsecured non-revolving facility | Fortis |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 500 |  |  |
Line of credit outstanding |  |  | $ 250 |  |  |  |  |  |  |  |
Operating credit facility | Newfoundland Power |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 130 | $ 100 |  |  |  |  |  |
Consolidated credit facilities |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 6,300 | $ 6,300 |  |  |  |  |  |  |  |  |
No one bank | Bank concentration risk | Credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  | 20.00% |  |  |  |  |  |  |  |  |
Committed facilities, maturing 2024 through 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 5,800 | $ 5,800 |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt to capital restriction on dividends | 0.65 | 0.65 | 0.65 |  |  |  |  |  |  |  |

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