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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, 2021 | Dec. 31, 2020
Disclosure of detailed information about hedging instruments [line items] |  |
Total payments on debt derivatives | $ (5,236) | $ (8,047)
Net (payments) proceeds on settlement of debt derivatives | (8) | 80
Debt derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 3,914 | 6,906
Total payments on debt derivatives | (3,931) | (6,826)
Net (payments) proceeds on settlement of debt derivatives | (17) | 80
Debt derivatives | US commercial paper program |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 2,911 | 5,542
Total payments on debt derivatives | (2,926) | (5,441)
Debt derivatives | Credit facilities |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total proceeds on debt derivatives | 1,003 | 1,364
Total payments on debt derivatives | $ (1,005) | $ (1,385)

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