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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Financial Instruments at Fair Value (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly traded companies | $ 1,535 | $ 1,831 |
Derivative financial assets | 1,011 | 1,439 | $ 1,500
Total financial assets | 2,974 | 3,410 |
Total financial liabilities | 428 | 140 |
Long-term debt (including current portion) | 18,201 | 15,967 | 14,290
Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,086 | 1,383 |
Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 34 | 55 | 92
Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,098 | 1,412 | 1,332
Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets |  | 1 | 122
Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt (including current portion) | 22,006 | 18,354 |
Fair value (Level 1) | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in publicly traded companies | 1,535 | 1,831 |
Total financial assets | 1,535 | 1,831 |
Total financial liabilities | 0 | 0 |
Fair value (Level 1) | Fair value | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
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 | 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 | 1,439 | 1,579 |
Total financial liabilities | 428 | 140 |
Fair value (Level 2) | Fair value | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities | 12 | 29 |
Fair value (Level 2) | Fair value | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 34 | 55 |
Fair value (Level 2) | Fair value | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,405 | 1,508 |
Derivative financial liabilities | 307 | 96 |
Fair value (Level 2) | Fair value | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 16 |
Derivative financial liabilities | 109 | 15 |
Before Offset Amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,439 | 1,579 |
Before Offset Amount | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 0 | $ 41
Derivative financial liabilities | 12 | 29 |
Before Offset Amount | Equity derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 34 | 55 |
Before Offset Amount | Cash flow hedges | Debt derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 1,405 | 1,508 |
Derivative financial liabilities | 307 | 96 |
Before Offset Amount | Cash flow hedges | Expenditure derivatives |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets | 0 | 16 |
Derivative financial liabilities | $ 109 | $ 15 |

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