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Long-Term Debt - Schedule of Credit Facilities (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Total credit facilities | $ 6,342 | $ 6,176
Credit facilities utilized: |  |
Short-term borrowings | (98) | (119)
Long-term debt (including current portion) | (33,405) | (29,703)
Letters of credit outstanding | (102) | (101)
Credit facilities unutilized | 3,926 | 4,384
Current installments of long-term debt | $ 1,990 | $ 2,296
Credit facility |  |
Credit facilities utilized: |  |
Long-term debt weighted average interest rate (percent) | 4.60% | 6.20%
Current installments of long-term debt | $ 1,860 | $ 1,160
Long-term Credit Facility Borrowings |  |
Credit facilities utilized: |  |
Long-term debt (including current portion) | (2,216) | (1,572)
Long-term Credit Facility Borrowings | Credit facility |  |
Credit facilities utilized: |  |
Long-term debt (including current portion) | (2,216) | (1,572)
Credit facility |  |
Credit facilities utilized: |  |
Short-term borrowings | $ (98) | $ (119)
Short-term debt weighted average interest rate (percent) | 6.10% | 6.90%
Regulated Utilities |  |
Line of Credit Facility [Line Items] |  |
Total credit facilities | $ 4,396 |
Credit facilities utilized: |  |
Letters of credit outstanding | (81) |
Credit facilities unutilized | 2,882 |
Regulated Utilities | Long-term Credit Facility Borrowings |  |
Credit facilities utilized: |  |
Long-term debt (including current portion) | (1,335) |
Regulated Utilities | Credit facility |  |
Credit facilities utilized: |  |
Short-term borrowings | (98) |
Corporate and Other |  |
Line of Credit Facility [Line Items] |  |
Total credit facilities | 1,946 |
Credit facilities utilized: |  |
Letters of credit outstanding | (21) |
Credit facilities unutilized | 1,044 |
Corporate and Other | Long-term Credit Facility Borrowings |  |
Credit facilities utilized: |  |
Long-term debt (including current portion) | (881) |
Corporate and Other | Credit facility |  |
Credit facilities utilized: |  |
Short-term borrowings | $ 0 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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