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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Financial Instruments at Fair Value (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly traded companies | $ 1,581 | $ 1,535 |
Derivative financial assets | 895 | 1,011 | $ 1,439
Total financial assets | 3,132 | 2,974 |
Total financial liabilities | 656 | 428 |
Long-term debt (including current portion) | 18,688 | 18,201 | 15,967
Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,121 | 1,086 |
Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 36 | 34 | 55
Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,110 | 1,098 | 1,412
Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets |  | (109) | 1
Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt (including current portion) | 20,790 | 22,006 |
Fair value (Level 1) | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly traded companies | 1,581 | 1,535 |
Total financial assets | 1,581 | 1,535 |
Total financial liabilities | 0 | 0 |
Fair value (Level 1) | Fair value | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Derivative financial liabilities | 0 | 0 |
Fair value (Level 1) | Fair value | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Fair value (Level 1) | Fair value | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Derivative financial liabilities | 0 | 0 |
Fair value (Level 1) | Fair value | Cash flow hedges | Interest rate derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Derivative financial liabilities | 0 | 0 |
Fair value (Level 1) | Fair value | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 |
Derivative financial liabilities | 0 | 0 |
Fair value (Level 2) | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly traded companies | 0 | 0 |
Total financial assets | 1,551 | 1,439 |
Total financial liabilities | 656 | 428 |
Fair value (Level 2) | Fair value | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 11 | 0 |
Derivative financial liabilities | 0 | 12 |
Fair value (Level 2) | Fair value | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 36 | 34 |
Fair value (Level 2) | Fair value | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,453 | 1,405 |
Derivative financial liabilities | 343 | 307 |
Fair value (Level 2) | Fair value | Cash flow hedges | Interest rate derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 40 | 0 |
Derivative financial liabilities | 283 | 0 |
Fair value (Level 2) | Fair value | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 11 | 0 |
Derivative financial liabilities | 30 | 109 |
Before Offset Amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,551 | 1,439 |
Before Offset Amount | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | (11) | 0 | $ (29)
Derivative financial liabilities | 0 | 12 |
Before Offset Amount | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 36 | 34 |
Before Offset Amount | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,453 | 1,405 |
Derivative financial liabilities | 343 | 307 |
Before Offset Amount | Cash flow hedges | Interest rate derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 40 | 0 |
Derivative financial liabilities | 283 | 0 |
Before Offset Amount | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 11 | 0 |
Derivative financial liabilities | $ 30 | $ 109 |

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