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Long-Term Debt - Summary of Credit Facility Balances (Details)
$ in Millions
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
May 31, 2023
CAD ($)
May 31, 2023
USD ($)
Apr. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Line of Credit Facility [Line Items]                
Total credit facilities $ 6,176           $ 5,850  
Regulated                
Line of Credit Facility [Line Items]                
Total credit facilities 3,943              
Regulated | ITC | Commercial paper                
Line of Credit Facility [Line Items]                
Total credit facilities   $ 400,000,000            
Amount outstanding   0           $ 134,000,000
Non-Regulated                
Line of Credit Facility [Line Items]                
Total credit facilities 2,233              
Unsecured committed revolving credit facilities | ITC                
Line of Credit Facility [Line Items]                
Total credit facilities         $ 1,000,000,000 $ 900,000,000    
Unsecured committed revolving credit facilities | Corporate and other                
Line of Credit Facility [Line Items]                
Total credit facilities     $ 1,300          
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   405,000,000            
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 700              
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 150              
Unsecured committed revolving credit facilities | Regulated | Other Electric                
Line of Credit Facility [Line Items]                
Total credit facilities 240 83,000,000            
Unsecured committed revolving credit facilities | Regulated | Other Electric | First redemption date                
Line of Credit Facility [Line Items]                
Total credit facilities 50              
Unsecured committed revolving credit facilities | Regulated | Other Electric | Second redemption date                
Line of Credit Facility [Line Items]                
Total credit facilities 90              
Unsecured committed revolving credit facilities | Regulated | Other Electric | Third redemption date                
Line of Credit Facility [Line Items]                
Total credit facilities 100              
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   70,000,000            
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   94,000,000            
Unsecured non-revolving facility | Corporate and other                
Line of Credit Facility [Line Items]                
Total credit facilities       $ 500,000,000        
Unsecured non-revolving facility | Non-Regulated | Corporate and other                
Line of Credit Facility [Line Items]                
Total credit facilities   500,000,000            
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 $ 22