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Long-Term Debt (Summary of Long-Term Debt, Revolving Credit Facilities, Outstanding Borrowings and Available Capacity) (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Debt issuance costs $ (137) $ (125)
Classification as liabilities held for sale (5) (696) 0
Amount due within one year (234) (676)
Long Term Debt, Adjustments (1,067) (801)
Long-Term Debt 18,173 17,689
Interest expense 110 109
Gas Utilities and Infrastructure    
Debt Instrument [Line Items]    
Long-term debt 2,279 2,339
Other Electric Utilities    
Debt Instrument [Line Items]    
Long-term debt 416 422
Other    
Debt Instrument [Line Items]    
Long-term debt 7,464 6,189
NSPI | Canadian Electric Utilities    
Debt Instrument [Line Items]    
Long-term debt $ 3,361 $ 3,886
Fixed to floating subordinated notes | Other    
Debt Instrument [Line Items]    
Weighted average interest rate 6.75% 6.75%
Maturity 2076  
Long-term debt $ 1,727 $ 1,587
Commercial Paper | NSPI | Canadian Electric Utilities    
Debt Instrument [Line Items]    
Interest Rate Terms Variable Variable
Maturity 2029  
Long-term debt $ 177 $ 721
Senior unsecured notes | Florida Electric Utility    
Debt Instrument [Line Items]    
Weighted average interest rate 4.36% 4.61%
Maturity 2029 - 2051  
Long-term debt $ 5,720 $ 5,654
Senior unsecured notes | Other    
Debt Instrument [Line Items]    
Weighted average interest rate 3.99% 3.65%
Maturity 2026 - 2046  
Long-term debt $ 3,525 $ 3,637
Senior unsecured notes | PGS | Gas Utilities and Infrastructure    
Debt Instrument [Line Items]    
Weighted average interest rate 5.63% 5.63%
Maturity 2028 - 2053  
Long-term debt $ 1,331 $ 1,223
Senior unsecured notes | NMGC | Gas Utilities and Infrastructure    
Debt Instrument [Line Items]    
Weighted average interest rate 3.78% 3.78%
Maturity 2026 - 2051  
Long-term debt $ 698 $ 642
Senior unsecured notes | NMGI | Gas Utilities and Infrastructure    
Debt Instrument [Line Items]    
Weighted average interest rate   3.64%
Maturity 2024  
Long-term debt $ 0 $ 198
Senior unsecured notes | NSPI | Canadian Electric Utilities    
Debt Instrument [Line Items]    
Weighted average interest rate 5.12% 5.13%
Maturity 2025 - 2097  
Long-term debt $ 3,184 $ 3,165
Senior unsecured notes | Other    
Debt Instrument [Line Items]    
Weighted average interest rate 4.84% 4.84%
Maturity 2030  
Long-term debt $ 500 $ 500
Unsecured loan notes | Other Electric Utilities    
Debt Instrument [Line Items]    
Weighted average interest rate 4.06% 4.78%
Maturity 2025 - 2028  
Long-term debt $ 143 $ 121
Unsecured loan notes | Other    
Debt Instrument [Line Items]    
Interest Rate Terms Variable Variable
Maturity 2026 - 2029  
Long-term debt $ 992 $ 465
Unsecured loan notes | NMGC | Gas Utilities and Infrastructure    
Debt Instrument [Line Items]    
Interest Rate Terms   Variable
Maturity 2024  
Long-term debt $ 0 $ 30
Unsecured loan notes | Other Electric Utilities    
Debt Instrument [Line Items]    
Interest Rate Terms Variable Variable
Maturity 2025 - 2027  
Long-term debt $ 104 $ 104
Secured loan notes | EBP | Gas Utilities and Infrastructure    
Debt Instrument [Line Items]    
Interest Rate Terms Variable Variable
Maturity 2028  
Long-term debt $ 250 $ 246
Secured senior notes and debentures | Other Electric Utilities    
Debt Instrument [Line Items]    
Weighted average interest rate 2.38% 3.06%
Maturity 2026 - 2040  
Long-term debt $ 169 $ 197
Junior subordinated notes | Other    
Debt Instrument [Line Items]    
Weighted average interest rate 7.63% 0.00%
Maturity 2054  
Long-term debt $ 720 $ 0