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Long-Term Debt - Schedule of Long-Term Debt (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Total long-term debt $ 33,405 $ 29,703
Less: Deferred financing costs and debt discounts (191) (172)
Less: Current installments of long-term debt (1,990) (2,296)
Long-term debt 31,224 27,235
Long-term Credit Facility Borrowings    
Debt Instrument [Line Items]    
Total long-term debt 2,216 1,572
Credit facility    
Debt Instrument [Line Items]    
Less: Current installments of long-term debt $ (1,860) $ (1,160)
Long-term debt weighted average interest rate (percent) 4.60% 6.20%
Credit facility | Long-term Credit Facility Borrowings    
Debt Instrument [Line Items]    
Total long-term debt $ 2,216 $ 1,572
ITC    
Debt Instrument [Line Items]    
Fair value adjustment - ITC acquisition 88 89
ITC | Unsecured | Fixed Rate Unsecured US Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 5,610 $ 5,165
Long-term debt weighted average interest rate (percent) 4.37% 4.16%
ITC | Unsecured | Fixed Rate Unsecured US Shareholder Note    
Debt Instrument [Line Items]    
Total long-term debt $ 286 $ 263
Stated interest rate 6.00% 6.00%
ITC | Secured | Fixed Rate Secured US First Mortgage Bonds    
Debt Instrument [Line Items]    
Total long-term debt $ 3,944 $ 3,268
Long-term debt weighted average interest rate (percent) 4.34% 4.22%
ITC | Secured | Fixed Rate Secured US Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 1,511 $ 1,278
Long-term debt weighted average interest rate (percent) 4.16% 4.00%
UNS Energy | Unsecured | Fixed Rate Unsecured US Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 4,172 $ 3,668
Long-term debt weighted average interest rate (percent) 4.09% 3.80%
Central Hudson | Unsecured | Fixed and Variable Rate Unsecured US Promissory Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 1,974 $ 1,687
Long-term debt weighted average interest rate (percent) 4.38% 4.27%
FortisBC Energy | Unsecured | Fixed Rate Unsecured Debentures    
Debt Instrument [Line Items]    
Total long-term debt $ 3,295 $ 3,295
Long-term debt weighted average interest rate (percent) 4.61% 4.61%
FortisAlberta | Unsecured | Fixed Rate Unsecured Debentures    
Debt Instrument [Line Items]    
Total long-term debt $ 2,835 $ 2,685
Long-term debt weighted average interest rate (percent) 4.63% 4.52%
FortisBC Electric | Unsecured | Fixed Rate Unsecured Debentures    
Debt Instrument [Line Items]    
Total long-term debt $ 960 $ 860
Long-term debt weighted average interest rate (percent) 4.72% 4.70%
Other Electric | Unsecured | Fixed Rate Unsecured Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 207 $ 152
Long-term debt weighted average interest rate (percent) 4.61% 4.45%
Other Electric | Unsecured | Fixed and Variable Rate Unsecured US Senior Loan Notes and Bonds    
Debt Instrument [Line Items]    
Total long-term debt $ 876 $ 702
Long-term debt weighted average interest rate (percent) 5.03% 4.89%
Other Electric | Secured | Fixed Rate Secured First Mortgage Sinking Fund Bonds    
Debt Instrument [Line Items]    
Total long-term debt $ 739 $ 748
Long-term debt weighted average interest rate (percent) 5.24% 5.24%
Other Electric | Secured | Fixed Rate Secured First Mortgage Bonds    
Debt Instrument [Line Items]    
Total long-term debt $ 320 $ 320
Long-term debt weighted average interest rate (percent) 5.29% 5.29%
Corporate and Other | Unsecured | Fixed Rate Unsecured Debentures    
Debt Instrument [Line Items]    
Total long-term debt $ 200 $ 200
Stated interest rate 6.51% 6.51%
Corporate and Other | Unsecured | Fixed Rate Unsecured Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 2,000 $ 1,500
Long-term debt weighted average interest rate (percent) 4.11% 4.10%
Corporate and Other | Unsecured | Fixed Rate Unsecured US Senior Notes and Promissory Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 2,172 $ 2,251
Long-term debt weighted average interest rate (percent) 3.79% 3.82%