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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Derivative Instruments - Net Asset (Liability) Position (Details) $ in Millions, $ in Millions | Dec. 31, 2024 CAD ($) $ / $ | Dec. 31, 2024 USD ($) $ / $ | Dec. 31, 2023 CAD ($) $ / $ | Dec. 31, 2023 USD ($) $ / $ | Dec. 31, 2022 CAD ($)
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Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | $ 425 |  |  |  | $ 1,136
Derivative financial liabilities |  |  | $ (538) |  |
Current derivative financial assets | (336) |  | (80) |  |
Non-current derivative financial assets | (997) |  | (571) |  |
Non-current derivative financial liabilities | (845) |  | (1,055) |  |
Net mark-to-market liability | 273 |  | (54) |  |
Net mark-to-market liability | 152 |  | (484) |  |
Canada, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Net mark-to-market liability | $ 425 |  | $ (538) |  |
Debt derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Exchange rate, assets | $ / $ | 1.4282 | 1.4282 |  |  |
Fair value, assets | $ 5 |  |  |  | 72
Exchange rate, liabilities | $ / $ | 1.4421 | 1.4421 | 1.3526 | 1.3526 |
Derivative financial liabilities |  |  | $ (101) |  |
Debt derivatives | United States of America, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets |  | $ 666 |  |  |
Notional amount, liabilities short-term |  | $ 696 |  | $ 3,354 |
Debt derivatives | Canada, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | $ 952 |  |  |  |
Notional amount, liabilities short-term | $ 1,004 |  | $ 4,537 |  |
Debt derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Exchange rate, assets | $ / $ | 1.2510 | 1.2510 | 1.1583 | 1.1583 |
Fair value, assets | $ 352 |  |  |  | 916
Exchange rate, liabilities | $ / $ | 1.3127 | 1.3127 | 1.3055 | 1.3055 |
Derivative financial liabilities |  |  | $ (470) |  |
Current derivative financial assets | $ (224) |  | (98) |  |
Non-current derivative financial assets | (133) |  | (473) |  |
Debt derivatives | Cash flow hedges | United States of America, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets |  | $ 11,116 |  | $ 4,557 |
Notional amount, liabilities |  | $ 6,550 |  | $ 10,550 |
Debt derivatives | Cash flow hedges | Canada, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | 13,906 |  | 5,278 |  |
Fair value, assets | 357 |  |  |  |
Notional amount, liabilities | $ 8,598 |  | 13,773 |  |
Derivative financial liabilities |  |  | $ (571) |  |
Expenditure derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Exchange rate, assets | $ / $ | 1.3362 | 1.3362 | 1.3147 | 1.3147 |
Fair value, assets | $ 132 |  |  |  | 94
Exchange rate, liabilities | $ / $ |  |  | 1.3315 | 1.3315 |
Derivative financial liabilities |  |  | $ (15) |  |
Current derivative financial assets | (105) |  |  |  |
Current derivative financial liabilities |  |  | (4) |  |
Non-current derivative financial assets | (27) |  |  |  |
Non-current derivative financial liabilities |  |  | (11) |  |
Expenditure derivatives | Cash flow hedges | United States of America, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets |  | $ 1,590 |  | $ 600 |
Notional amount, liabilities |  |  |  | $ 1,050 |
Expenditure derivatives | Cash flow hedges | Canada, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets | 2,125 |  | 789 |  |
Fair value, assets | $ 132 |  |  |  |
Notional amount, liabilities |  |  | 1,398 |  |
Derivative financial liabilities |  |  | $ (15) |  |
Equity derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Exchange rate, assets | $ / $ |  |  | 0 | 0 |
Fair value, assets |  |  | $ 48 |  | $ 54
Exchange rate, liabilities | $ / $ | 0 | 0 |  |  |
Derivative financial liabilities | $ (54) |  |  |  |
Current derivative financial liabilities | (54) |  |  |  |
Non-current derivative financial liabilities | 0 |  |  |  |
Equity derivatives | United States of America, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets |  |  |  | $ 0 |
Notional amount, liabilities |  | $ 0 |  |  |
Equity derivatives | Canada, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, assets |  |  | 324 |  |
Notional amount, liabilities | 320 |  |  |  |
Derivative financial liabilities | $ (54) |  |  |  |
Purchase Agreements |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Exchange rate, liabilities | $ / $ | 0 | 0 |  |  |
Derivative financial liabilities | $ (10) |  | 0 |  |
Current derivative financial liabilities | (2) |  |  |  |
Non-current derivative financial liabilities | (8) |  |  |  |
Purchase Agreements | United States of America, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, liabilities |  | $ 0 |  |  |
Purchase Agreements | Canada, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Notional amount, liabilities | 0 |  |  |  |
Derivative financial liabilities | (10) |  |  |  |
Before Offset Amount |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 1,333 |  | 651 |  |
Derivative financial liabilities | (908) |  | (1,189) |  |
Before Offset Amount | Debt derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets |  |  | 0 |  |
Current derivative financial assets | (7) |  |  |  |
Current derivative financial liabilities | (2) |  | (101) |  |
Non-current derivative financial assets | 0 |  |  |  |
Non-current derivative financial liabilities | 0 |  | 0 |  |
Before Offset Amount | Debt derivatives | Canada, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 7 |  |  |  |
Derivative financial liabilities | (2) |  | (101) |  |
Before Offset Amount | Debt derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Current derivative financial assets | (224) |  | (29) |  |
Current derivative financial liabilities | (5) |  | (26) |  |
Non-current derivative financial assets | (970) |  | (570) |  |
Non-current derivative financial liabilities | (837) |  | (1,043) |  |
Before Offset Amount | Debt derivatives | Cash flow hedges | Canada, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 1,194 |  | 599 |  |
Derivative financial liabilities | (842) |  | (1,069) |  |
Before Offset Amount | Expenditure derivatives | Cash flow hedges |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Derivative financial liabilities | 0 |  |  |  |
Current derivative financial assets | (105) |  | (3) |  |
Current derivative financial liabilities |  |  | (7) |  |
Non-current derivative financial assets | (27) |  | (1) |  |
Non-current derivative financial liabilities |  |  | (12) |  |
Before Offset Amount | Expenditure derivatives | Cash flow hedges | Canada, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 132 |  | 4 |  |
Derivative financial liabilities |  |  | (19) |  |
Before Offset Amount | Equity derivatives |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 0 |  |  |  |
Derivative financial liabilities |  |  | 0 |  |
Current derivative financial assets |  |  | (48) |  |
Current derivative financial liabilities | (54) |  |  |  |
Non-current derivative financial assets |  |  | 0 |  |
Non-current derivative financial liabilities | 0 |  |  |  |
Before Offset Amount | Equity derivatives | Canada, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets |  |  | $ 48 |  |
Derivative financial liabilities | (54) |  |  |  |
Before Offset Amount | Purchase Agreements |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Fair value, assets | 0 |  |  |  |
Current derivative financial liabilities | (2) |  |  |  |
Non-current derivative financial liabilities | (8) |  |  |  |
Before Offset Amount | Purchase Agreements | Canada, Dollars |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |
Derivative financial liabilities | $ (10) |  |  |  |

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