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Regulatory Assets and Liabilities - Assets and Liabilities (Narrative) (Details)
$ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Feb. 28, 2021
USD ($)
Jan. 31, 2020
USD ($)
Dec. 31, 2025
CAD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Jun. 15, 2021
USD ($)
Public Utilities, General Disclosures [Line Items]                  
Regulatory Assets           $ 3,105   $ 3,620  
NMGC winter event gas cost recovery                  
Public Utilities, General Disclosures [Line Items]                  
Regulatory Assets           $ 0   $ 69  
GBPC | Hurricane | Loss from Catastrophes                  
Public Utilities, General Disclosures [Line Items]                  
Storm cost     $ 15            
Recovery Period           5 years      
GBPC | Steam turbine                  
Public Utilities, General Disclosures [Line Items]                  
Public Utilities, Property, Plant and Equipment, Amount of Loss (Recovery) on Plant Abandonment             $ 21    
NSPI                  
Public Utilities, General Disclosures [Line Items]                  
Storm cost           $ 10      
NSPI | Forecast                  
Public Utilities, General Disclosures [Line Items]                  
Storm cost       $ 10 $ 10        
Tampa Electric                  
Public Utilities, General Disclosures [Line Items]                  
Storm cost $ 119           $ 29    
Recovery Period           15 years      
NMGC                  
Public Utilities, General Disclosures [Line Items]                  
Recovery Period           30 months      
Incremental gas cost   $ 108              
NMGC | NMGC winter event gas cost recovery                  
Public Utilities, General Disclosures [Line Items]                  
Regulatory Assets                 $ 108