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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Net Cash Proceeds (Payments) on Debt Derivatives (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about hedging instruments [line items] |  |
Total payments on debt derivatives | $ (27,534) | $ (53,831)
Net proceeds on settlement of debt derivatives | 107 | 492
Debt derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 26,049 | 53,029
Total payments on debt derivatives | (25,942) | (52,537)
Net proceeds on settlement of debt derivatives | 107 | 492
Net proceeds on settlement of debt derivatives and forward contracts | 107 | 492
Debt derivatives | US commercial paper program |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 2,478 | 2,486
Total payments on debt derivatives | (2,466) | (2,506)
Debt derivatives | Credit facilities |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 23,368 | 47,126
Total payments on debt derivatives | (23,280) | (47,136)
Debt derivatives | Senior notes |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 0 | 3,232
Total payments on debt derivatives | 0 | (2,710)
Debt derivatives | Lease Liabilities |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 203 | 185
Total payments on debt derivatives | $ (196) | $ (185)

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