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Investments Subject to Significant Influence and Equity Income (Summary of Investments Subject to Significant Influence - NSPML) (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Balance Sheets      
Current assets $ 3,688 $ 3,708  
Property, plant and equipment 26,168 24,376  
Regulatory assets 2,832 2,766  
Non-current assets 13,095 11,396  
Total assets 42,951 39,480  
Current liabilities 5,115 4,544  
Non-current liabilities 24,545 22,848  
Equity 13,291 12,088 $ 11,441
Total liabilities and equity 42,951 39,480  
Canadian Electric Utilities [Member] | Operating Segments [Member]      
Balance Sheets      
Total assets 7,609 8,634  
Variable Interest Entity, Not Primary Beneficiary | NSP Maritime Link Inc. [Member]      
Balance Sheets      
Current assets 37 21  
Property, plant and equipment 1,425 1,473  
Regulatory assets 778 272  
Non-current assets 27 29  
Total assets 2,267 1,795  
Current liabilities 55 48  
Long-term debt 1,570 1,109  
Non-current liabilities 167 149  
Equity 475 489  
Total liabilities and equity 2,267 $ 1,795  
Variable Interest Entity, Not Primary Beneficiary | NSP Maritime Link Inc. [Member] | Bond Under Federal Loan Guarantee [Member]      
Balance Sheets      
Long-term debt 500    
Nova Scotia Power Inc. [Member] | Canadian Electric Utilities [Member] | NSP Maritime Link Inc. [Member] | Operating Segments [Member]      
Balance Sheets      
Approval to create regulatory asset for federal loan guarantee debt $ 500