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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, 2023
Dec. 31, 2022
Changes in non-cash working capital    
Inventory $ (31) $ (214)
Receivables and other current assets 653 (636)
Accounts payable (538) 423
Other current liabilities (179) 193
Total non-cash working capital (95) (234)
Supplemental disclosure of cash paid:    
Interest 930 699
Income Taxes 43 67
Supplemental disclosure of non-cash activities:    
Common share dividends reinvested 271 237
Reclassification of short-term debt to long-term debt 657 0
Reclassification of long-term debt to short-term debt 0 500
Decrease in accrued capital expenditures (19) (13)
Supplemental disclosure of operating activities:    
Net change in short-term regulatory assets and liabilities 123 (157)
January 2023 Settlement Of NMGC Gas Hedges [Member]    
Changes in non-cash working capital    
Receivables and other current assets 162 (162)
Nova Scotia Cap-And-Trade Program [Member]    
Changes in non-cash working capital    
Other current liabilities $ (166) $ 172