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Long-Term Debt - Summary of Credit Facility Balances (Details) $ in Millions | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | May 31, 2024 CAD ($) | Apr. 30, 2024 CAD ($) | Mar. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | $ 6,342 |  |  |  |  | $ 6,176 |
Regulated |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 4,396 |  |  |  |  |  |
Regulated | ITC | Commercial paper |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities |  | $ 400,000,000 |  |  |  |  |
Amount outstanding |  | 0 |  |  |  |  | $ 0
Non-Regulated |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 1,946 |  |  |  |  |  |
Unsecured committed revolving credit facilities | FortisBC Energy |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities |  |  |  | $ 900 | $ 700 |  |
Unsecured committed revolving credit facilities | FortisBC Electric |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities |  |  | $ 200 | $ 150 |  |  |
Unsecured committed revolving credit facilities | Regulated | ITC |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities |  | 1,000,000,000 |  |  |  |  |
Unsecured committed revolving credit facilities | Regulated | UNS Energy |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities |  | 375,000,000 |  |  |  |  |
Unsecured committed revolving credit facilities | Regulated | Central Hudson |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities |  | 250,000,000 |  |  |  |  |
Unsecured committed revolving credit facilities | Regulated | FortisBC Energy |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 900 |  |  |  |  |  |
Unsecured committed revolving credit facilities | Regulated | FortisAlberta |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 250 |  |  |  |  |  |
Unsecured committed revolving credit facilities | Regulated | FortisBC Electric |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 200 |  |  |  |  |  |
Unsecured committed revolving credit facilities | Regulated | Other Electric |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 285 | 83,000,000 |  |  |  |  |
Unsecured committed revolving credit facilities | Regulated | Other Electric | First redemption date |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 90 |  |  |  |  |  |
Unsecured committed revolving credit facilities | Regulated | Other Electric | Second redemption date |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 65 |  |  |  |  |  |
Unsecured committed revolving credit facilities | Regulated | Other Electric | Third redemption date |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 130 |  |  |  |  |  |
Unsecured committed revolving credit facilities | Non-Regulated | Corporate and other |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 1,350 |  |  |  |  |  |
Unsecured committed revolving credit facilities | Non-Regulated | Corporate and other | First redemption date |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 50 |  |  |  |  |  |
Unsecured committed revolving credit facilities | Non-Regulated | Corporate and other | Second redemption date |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 1,300 |  |  |  |  |  |
Uncommitted credit facility | Regulated | Central Hudson |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities |  | 60,000,000 |  |  |  |  |
Uncommitted credit facility | Regulated | FortisBC Energy |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 55 |  |  |  |  |  |
Unsecured demand overdraft facility | Regulated | FortisBC Electric |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 10 |  |  |  |  |  |
Unsecured demand facilities | Regulated | Other Electric |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | 20 |  |  |  |  |  |
Unsecured demand credit facility and emergency standby loan | Regulated | Other Electric |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities |  | 93,000,000 |  |  |  |  |
Unsecured non-revolving facility | Non-Regulated | Corporate and other |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities |  | 250,000,000 |  |  |  |  |
Unsecured revolving facility | Non-Regulated | Corporate and other |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities |  | $ 150,000,000 |  |  |  |  |
Unsecured non-revolving facility | Non-Regulated | Corporate and other |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Total credit facilities | $ 21 |  |  |  |  |  |

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