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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Restricted Long-Term Investments (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Long-Lived Assets Held-for-sale [Line Items] |  |
Debt securities, available-for-sale, amortized cost | $ 540 | $ 486
Unrealized holding gains (losses) | $ 33 | $ 51
Fair value recurring basis unobservable input reconciliation asset gain loss statement of other comprehensive income extensible list not disclosed flag | investments | investments
Future abandonment costs | $ 826 | $ 745
Total long - term regulatory liabilities | 6,112 | 3,521
Pipeline future abandonment costs |  |
Long-Lived Assets Held-for-sale [Line Items] |  |
Total long - term regulatory liabilities | 826 | 745
Level 1 |  |
Long-Lived Assets Held-for-sale [Line Items] |  |
Restricted long-term investments and cash (Note 23) | 491 | 263
Level 2 |  |
Long-Lived Assets Held-for-sale [Line Items] |  |
Restricted long-term investments and cash (Note 23) | 507 | 454
Fair Value |  |
Long-Lived Assets Held-for-sale [Line Items] |  |
Restricted long-term investments and cash (Note 23) | $ 998 | $ 717

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