COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - CAD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Dec. 31, 2025 |
|
| Disclosure Of Commitments And Contingent Liabilities [Line Items] | ||
| Transportation and storage | $ 45,893 | |
| Total commitments | 48,603 | |
| Outstanding letters of credit | $ 368 | $ 341 |
| Minimum | ||
| Disclosure Of Commitments And Contingent Liabilities [Line Items] | ||
| Transportation commitments subject to regulatory approval or approved but not yet in service term | 56 years | |
| Commitments approved and not yet in service | ||
| Disclosure Of Commitments And Contingent Liabilities [Line Items] | ||
| Transportation and storage | $ 19,800 | |
| HMLP | ||
| Disclosure Of Commitments And Contingent Liabilities [Line Items] | ||
| Total commitments | $ 1,700 |