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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Derivative Instruments - Net Asset (Liability) Position (Details) $ in Millions, $ in Millions | Dec. 31, 2021 CAD ($) $ / $ | Dec. 31, 2021 USD ($) $ / $ | Dec. 31, 2020 CAD ($) $ / $ | Dec. 31, 2020 USD ($) $ / $ | Dec. 31, 2019 CAD ($)
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Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | $ 895 |  | $ 1,011 |  | $ 1,439
Debt derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | $ 1,389 | $ 1,104 |  |  |
Exchange rate, assets | $ / $ | 1.2578 | 1.2578 |  |  |
Fair value, assets | $ 1,121 |  | $ 1,086 |  |
Exchange rate, liabilities | $ / $ |  |  | 1.2995 | 1.2995 |
Derivative Liabilities, Notional Amount1 |  |  | $ 583 | $ 449 |
Fair value, liabilities | 11 |  | (12) |  |
Debt derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | $ 6,661 | $ 5,859 | $ 4,912 | $ 4,550 |
Exchange rate, assets | $ / $ | 1.1369 | 1.1369 | 1.0795 | 1.0795 |
Fair value, assets | $ 1,110 |  | $ 1,098 |  | 1,412
Exchange rate, liabilities | $ / $ | 1.3025 | 1.3025 | 1.3358 | 1.3358 |
Derivative Liabilities, Notional Amount1 | $ 7,011 | $ 5,383 | $ 6,201 | $ 4,642 |
Expenditure derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | $ 545 | $ 438 |  |  |
Exchange rate, assets | $ / $ | 1.2453 | 1.2453 |  |  |
Fair value, assets |  |  | $ (109) |  | 1
Exchange rate, liabilities | $ / $ | 1.3151 | 1.3151 | 1.3421 | 1.3421 |
Derivative Liabilities, Notional Amount1 | $ 829 | $ 630 | $ 2,134 | $ 1,590 |
Fair value, liabilities | (19) |  |  |  |
Equity derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | 265 |  | 238 |  |
Fair value, assets | 36 |  | 34 |  | 55
Interest rate derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, liabilities | (243) |  |  |  |
Interest rate derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | 3,250 |  |  |  |
Derivative Liabilities, Notional Amount1 | 500 | 2,000 |  |  |
Fair value, liabilities | (243) |  |  |  |
Before Offset Amount |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 1,551 |  | 1,439 |  |
Fair value, liabilities | (656) |  | (428) |  |
Before Offset Amount | Debt derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | (11) |  | 0 |  | $ (29)
Fair value, liabilities | 0 |  | (12) |  |
Before Offset Amount | Debt derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 1,453 |  | 1,405 |  |
Fair value, liabilities | (343) |  | (307) |  |
Before Offset Amount | Expenditure derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 11 |  | 0 |  |
Fair value, liabilities | (30) |  | (109) |  |
Before Offset Amount | Equity derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 36 |  | 34 |  |
Fair value, liabilities | 0 |  | 0 |  |
Before Offset Amount | Interest rate derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, liabilities | (283) |  |  |  |
Before Offset Amount | Interest rate derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 40 |  | 0 |  |
Fair value, liabilities | $ (6) | $ (277) | $ 0 |  |

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