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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

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