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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