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Regulatory Assets and Liabilities - Other Electric Utilities (Narrative) (Details)
$ in Millions, $ in Millions
1 Months Ended 12 Months Ended
May 06, 2024
MW
Sep. 30, 2022
USD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Jul. 18, 2024
USD ($)
Public Utilities, General Disclosures [Line Items]          
Regulatory liabilities     $ 1,880 $ 1,772  
Barbados Light and Power Company Limited          
Public Utilities, General Disclosures [Line Items]          
Approved regulated return on equity     10.00% 10.00%  
Barbados Light and Power Company Limited | Fair Trading Commission          
Public Utilities, General Disclosures [Line Items]          
Approved regulated return on equity   11.75%      
Allowed equity capital structure   55.00%      
Deferred Tax Liabilities, Regulatory Assets and Liabilities         $ 5
Public Utilities, Interim Rate Increase (Decrease), Amount   $ 1      
Regulatory liabilities   $ 71      
New corporate income tax rate     9.00%    
Approved capacity for recovery of battery storage | MW 15        
GBPC | Electric Transmission          
Public Utilities, General Disclosures [Line Items]          
Approved regulated return on equity     8.52% 8.32%