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Long-Term Debt - Schedule of Long-Term Debt (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Total long-term debt $ 29,703 $ 28,578
Less: Deferred financing costs and debt discounts (172) (166)
Less: Current installments of long-term debt (2,296) (2,481)
Long-term debt 27,235 25,931
Long-term Credit Facility Borrowings    
Debt Instrument [Line Items]    
Total long-term debt 1,572 1,657
Credit facility    
Debt Instrument [Line Items]    
Less: Current installments of long-term debt $ (1,160) $ (1,376)
Long-term debt weighted average interest rate (percent) 6.20% 5.10%
Credit facility | Long-term Credit Facility Borrowings    
Debt Instrument [Line Items]    
Total long-term debt $ 1,572 $ 1,657
ITC    
Debt Instrument [Line Items]    
Fair value adjustment - ITC acquisition 89 102
ITC | Unsecured | Fixed Rate Unsecured US Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 5,165 $ 4,541
Long-term debt weighted average interest rate (percent) 4.16% 3.98%
ITC | Unsecured | Fixed Rate Unsecured US Shareholder Note    
Debt Instrument [Line Items]    
Total long-term debt $ 263 $ 270
Stated interest rate 6.00% 6.00%
ITC | Secured | Fixed Rate Secured US First Mortgage Bonds    
Debt Instrument [Line Items]    
Total long-term debt $ 3,268 $ 3,344
Long-term debt weighted average interest rate (percent) 4.22% 4.22%
ITC | Secured | Fixed Rate Secured US Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 1,278 $ 1,186
Long-term debt weighted average interest rate (percent) 4.00% 3.83%
UNS Energy | Unsecured | Fixed and Variable Rate Unsecured US Tax-Exempt Bonds    
Debt Instrument [Line Items]    
Total long-term debt $ 0 $ 123
Long-term debt weighted average interest rate (percent) 4.00% 4.00%
UNS Energy | Unsecured | Fixed Rate Unsecured US Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 3,668 $ 3,450
Long-term debt weighted average interest rate (percent) 3.80% 3.58%
Central Hudson | Unsecured | Fixed and Variable Rate Unsecured US Promissory Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 1,687 $ 1,526
Long-term debt weighted average interest rate (percent) 4.27% 4.14%
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 $ 2,685 $ 2,485
Long-term debt weighted average interest rate (percent) 4.52% 4.49%
FortisBC Electric | Unsecured | Fixed Rate Unsecured Debentures    
Debt Instrument [Line Items]    
Total long-term debt $ 860 $ 860
Long-term debt weighted average interest rate (percent) 4.70% 4.70%
FortisBC Electric | Secured | Fixed Rate Secured Debentures    
Debt Instrument [Line Items]    
Total long-term debt $ 0 $ 25
Stated interest rate 8.80% 8.80%
Other Electric | Unsecured | Fixed Rate Unsecured Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 152 $ 152
Long-term debt weighted average interest rate (percent) 4.45% 4.45%
Other Electric | Unsecured | Fixed and Variable Rate Unsecured US Senior Loan Notes and Bonds    
Debt Instrument [Line Items]    
Total long-term debt $ 702 $ 745
Long-term debt weighted average interest rate (percent) 4.89% 4.71%
Other Electric | Secured | Fixed Rate Secured First Mortgage Sinking Fund Bonds    
Debt Instrument [Line Items]    
Total long-term debt $ 748 $ 666
Long-term debt weighted average interest rate (percent) 5.24% 5.26%
Other Electric | Secured | Fixed Rate Secured First Mortgage Bonds    
Debt Instrument [Line Items]    
Total long-term debt $ 320 $ 260
Long-term debt weighted average interest rate (percent) 5.29% 5.31%
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 $ 1,500 $ 1,000
Long-term debt weighted average interest rate (percent) 4.10% 3.31%
Corporate and Other | Unsecured | Fixed Rate Unsecured US Senior Notes and Promissory Notes    
Debt Instrument [Line Items]    
Total long-term debt $ 2,251 $ 2,691
Long-term debt weighted average interest rate (percent) 3.82% 3.82%