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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Derivative Instruments - Net Asset (Liability) Position (Details) $ in Millions, $ in Millions | Dec. 31, 2023 CAD ($) $ / $ | Dec. 31, 2023 USD ($) $ / $ | Dec. 31, 2022 CAD ($) $ / $ | Dec. 31, 2022 USD ($) $ / $ | Dec. 31, 2021 CAD ($)
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Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | $ (538) |  | $ 1,136 |  | $ 895
Current portion of derivative instruments | 80 |  | 689 |  |
Derivative instruments | 571 |  | 861 |  |
Net mark-to-market asset | (538) |  | 1,136 |  |
Net mark-to-market asset | (54) |  | 673 |  |
Net mark-to-market asset | (484) |  | 463 |  |
Derivative instruments | (1,055) |  | (398) |  |
Debt derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets |  |  | $ 1,517 | $ 1,173 |
Exchange rate, assets | $ / $ |  |  | 1.2930 | 1.2930 |
Fair value, assets | $ (571) |  | $ 988 |  |
Exchange rate, liabilities | $ / $ | 1.3526 | 1.3526 |  |  |
Derivative financial liabilities | $ 101 |  | (72) |  |
Notional amount, liabilities | 4,537 | $ 3,354 |  |  |
Current portion of derivative instruments | (98) |  | 525 |  |
Derivative instruments | (473) |  | 463 |  |
Debt derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | $ 5,278 | $ 4,557 | $ 9,180 | $ 7,834 |
Exchange rate, assets | $ / $ | 1.1583 | 1.1583 | 1.1718 | 1.1718 |
Fair value, assets | $ (470) |  | $ 916 |  | 1,110
Notional amount, liabilities | $ 13,773 | $ 10,550 | $ 9,738 | $ 7,491 |
Exchange rate, liabilities | $ / $ | 1.3055 | 1.3055 | 1.3000 | 1.3000 |
Interest rate derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Derivative financial liabilities |  |  | $ 0 |  |
Interest rate derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets |  |  | 0 |  |
Expenditure derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | $ 789 | $ 600 | $ 1,200 | $ 960 |
Exchange rate, assets | $ / $ | 1.3147 | 1.3147 | 1.2500 | 1.2500 |
Fair value, assets |  |  | $ 94 |  | (19)
Notional amount, liabilities | $ 1,398 | $ 1,050 |  |  |
Exchange rate, liabilities | $ / $ | 1.3315 | 1.3315 |  |  |
Derivative financial liabilities | $ 15 |  | 94 |  |
Current portion of derivative instruments |  |  | 94 |  |
Current derivative financial liabilities | (4) |  |  |  |
Derivative instruments |  |  | 0 |  |
Derivative instruments | (11) |  |  |  |
Equity derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | 324 |  | 295 |  |
Fair value, assets | 48 |  | 54 |  | 36
Current portion of derivative instruments | 48 |  |  |  |
Derivative instruments | 0 |  |  |  |
Before Offset Amount |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 651 |  | 1,550 |  |
Derivative financial liabilities | 1,189 |  | 414 |  |
Before Offset Amount | Debt derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 0 |  | 72 |  |
Derivative financial liabilities | 101 |  | 0 |  | $ 11
Current portion of derivative instruments |  |  | 72 |  |
Current derivative financial liabilities | (101) |  |  |  |
Derivative instruments |  |  | 0 |  |
Derivative instruments | 0 |  |  |  |
Before Offset Amount | Debt derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 599 |  | 1,330 |  |
Derivative financial liabilities | 1,069 |  | 414 |  |
Current portion of derivative instruments | 29 |  | 469 |  |
Current derivative financial liabilities | (26) |  | (16) |  |
Derivative instruments | 570 |  | 861 |  |
Derivative instruments | (1,043) |  | (398) |  |
Before Offset Amount | Interest rate derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Derivative financial liabilities |  |  | 0 |  |
Before Offset Amount | Interest rate derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets |  |  | 0 |  |
Derivative financial liabilities |  |  | 243 |  |
Before Offset Amount | Expenditure derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 4 |  | 94 |  |
Derivative financial liabilities | 19 |  | 0 |  |
Current portion of derivative instruments | 3 |  | 94 |  |
Current derivative financial liabilities | (7) |  |  |  |
Derivative instruments | 1 |  | 0 |  |
Derivative instruments | (12) |  |  |  |
Before Offset Amount | Equity derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 48 |  | 54 |  |
Derivative financial liabilities | 0 |  | 0 |  |
Current portion of derivative instruments | 48 |  | 54 |  |
Derivative instruments | $ 0 |  | $ 0 |  |

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