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LEASES - Schedule of Supplemental Statements of Financial Position (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Leases, Operating [Abstract] |  |
Operating lease right-of-use assets, net | $ 785 | $ 669
Operating lease liabilities - current | 121 | 98
Operating lease liabilities - long-term | 738 | 652
Total operating lease liabilities | $ 859 | $ 750
Operating lease, right-of-use asset, statement of financial position [Extensible List] | Deferred amounts and other assets | Deferred amounts and other assets
Operating lease, liability, current, statement of financial position [Extensible List] | Trade payables and accrued liabilities | Trade payables and accrued liabilities
Operating lease, liability, noncurrent, statement of financial position [Extensible List] | Other long-term liabilities | Other long-term liabilities
Finance leases |  |
Finance lease right-of-use assets, net | $ 294 | $ 287
Finance lease liabilities - current | 16 | 19
Finance lease liabilities - long-term | 300 | 264
Total finance lease liabilities | $ 316 | $ 283
Finance lease, right-of-use asset, statement of financial position [Extensible List] | Property, plant and equipment, net (Note 11) | Property, plant and equipment, net (Note 11)
Finance lease, liability, current, statement of financial position [Extensible List] | Current portion of long-term debt (Note 17) | Current portion of long-term debt (Note 17)
Finance lease, liability, noncurrent, statement of financial position [Extensible List] | Other long-term liabilities | Other long-term liabilities
Weighted average remaining lease term |  |
Operating leases (in years) | 14 years | 12 years
Finance leases (in years) | 31 years | 31 years
Weighted average discount rate |  |
Operating leases (as percent) | 4.80% | 4.50%
Finance leases (as percent) | 5.80% | 5.70%
Affiliated Entity |  |
Leases, Operating [Abstract] |  |
Operating lease right-of-use assets, net | $ 42 | $ 42
Operating lease liabilities - current | 6 | 5
Operating lease liabilities - long-term | $ 37 | $ 38

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