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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Derivative Instruments - Net Asset (Liability) Position (Details) $ in Millions, $ in Millions | Dec. 31, 2020 CAD ($) $ / $ | Dec. 31, 2020 USD ($) $ / $ | Dec. 31, 2019 CAD ($) $ / $ | Dec. 31, 2019 USD ($) $ / $ | Dec. 31, 2018 CAD ($)
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Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | $ 1,011 |  | $ 1,439 |  | $ 1,500
Debt derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 1,086 |  | 1,383 |  |
Notional amount, liabilities | $ 583 | $ 449 | $ 1,618 | $ 1,223 |
Exchange rate, liabilities | $ / $ | 1.2995 | 1.2995 | 1.3227 | 1.3227 |
Fair value, liabilities | $ (12) |  | $ (29) |  |
Debt derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | $ 4,912 | $ 4,550 | $ 6,587 | $ 5,800 |
Exchange rate, assets | $ / $ | 1.0795 | 1.0795 | 1.1357 | 1.1357 |
Fair value, assets | $ 1,098 |  | $ 1,412 |  | 1,332
Notional amount, liabilities | $ 6,201 | $ 4,642 | $ 3,409 | $ 2,570 |
Exchange rate, liabilities | $ / $ | 1.3359 | 1.3359 | 1.3263 | 1.3263 |
Expenditure derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets |  |  | $ 335 | $ 270 |
Exchange rate, assets | $ / $ |  |  | 1.2391 | 1.2391 |
Fair value, assets |  |  | $ 1 |  | 122
Notional amount, liabilities | $ 2,134 | $ 1,590 | $ 952 | $ 720 |
Exchange rate, liabilities | $ / $ | 1.3421 | 1.3421 | 1.3228 | 1.3228 |
Fair value, liabilities | $ (109) |  |  |  |
Equity derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | 238 |  | $ 223 |  |
Fair value, assets | 34 |  | 55 |  | 92
Before Offset Amount |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 1,439 |  | 1,579 |  |
Fair value, liabilities | (428) |  | (140) |  |
Before Offset Amount | Debt derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 0 |  | 0 |  | $ 41
Fair value, liabilities | (12) |  | (29) |  |
Before Offset Amount | Debt derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 1,405 |  | 1,508 |  |
Fair value, liabilities | (307) |  | (96) |  |
Before Offset Amount | Expenditure derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 0 |  | 16 |  |
Fair value, liabilities | (109) |  | (15) |  |
Before Offset Amount | Equity derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 34 |  | 55 |  |
Fair value, liabilities | $ 0 |  | $ 0 |  |

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