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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, 2020 | Dec. 31, 2019
Disclosure of detailed information about hedging instruments [line items] |  |
Total payments on debt derivatives | $ (8,047) | $ (18,865)
Net proceeds (payments) on settlement of debt derivatives | 80 | (121)
Debt derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 6,906 | 17,620
Total payments on debt derivatives | (6,826) | (17,630)
Net proceeds (payments) on settlement of debt derivatives | 80 | (10)
Debt derivatives | Commercial paper program |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 5,542 | 17,056
Total payments on debt derivatives | (5,441) | (17,069)
Debt derivatives | Credit facilities |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 1,364 | 564
Total payments on debt derivatives | (1,385) | (561)
Debt derivatives | Senior notes |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 0 | 0
Total payments on debt derivatives | $ 0 | $ 0

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