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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, 2022 | Dec. 31, 2021
Disclosure of detailed information about hedging instruments [line items] |  |
Total payments on debt derivatives | $ (12,379) | $ (5,236)
Net proceeds (payments) on settlement of debt derivatives | (11) | (8)
Debt derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 11,016 | 3,914
Total payments on debt derivatives | (10,975) | (3,931)
Net proceeds (payments) on settlement of debt derivatives | 41 | (17)
Net payments on settlement of debt derivatives and forward contracts | 11 | 8
Debt derivatives | US commercial paper program |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 9,522 | 2,911
Total payments on debt derivatives | (9,458) | (2,926)
Proceeds on Canadian dollar-denominated interest rate derivatives | 113 | 9
Payments on US dollar-denominated Interest rate derivatives | (165) | 0
Debt derivatives | Credit facilities |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 507 | 1,003
Total payments on debt derivatives | (498) | (1,005)
Debt derivatives | Senior notes |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 987 | 0
Total payments on debt derivatives | $ (1,019) | $ 0

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