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Supplementary Information to Consolidated Statements of Cash Flows (Summary of Supplementary Information to Consolidated Statement of Cash Flows) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Changes in non-cash working capital    
Inventory $ 38 $ (31)
Receivables and other current assets (154) 653
Accounts payable 536 (538)
Other current liabilities 32 (179)
Total non-cash working capital (452) 95
Supplemental disclosure of cash paid:    
Interest 989 930
Income Taxes 34 43
Supplemental disclosure of non-cash activities:    
Accrued proceeds from disposal of investment subject to significant influence 25 0
Common share dividends reinvested 291 271
Reclassification of short-term debt to long-term debt 0 657
Decrease in accrued capital expenditures 0 (19)
Supplemental disclosure of operating activities:    
Net change in short-term regulatory assets and liabilities $ (118) 123
January 2023 Settlement Of NMGC Gas Hedges [Member]    
Changes in non-cash working capital    
Receivables and other current assets   162
Nova Scotia Cap-And-Trade Program [Member]    
Changes in non-cash working capital    
Other current liabilities   $ 166