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financial instruments - Fair Values Derivatives (Details) | 12 Months Ended
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Dec. 31, 2024 CAD ($) $ / $ $ / shares ₱ / shares € / $ $ / € TWh | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 CAD ($) ₱ / shares | Dec. 31, 2023 CAD ($) $ / $ | Dec. 31, 2023 CAD ($) $ / € | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 CAD ($) TWh
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Current Assets, Fair value and carrying value | $ 65,000,000 | $ 36,000,000 | $ 36,000,000 | $ 36,000,000 | $ 36,000,000 | $ 36,000,000 | $ 36,000,000 | $ 36,000,000
Current Liabilities, Fair value and carrying value | $ 11,000,000 | 25,000,000 | 25,000,000 | 25,000,000 | 25,000,000 | 25,000,000 | $ 25,000,000 | 25,000,000
Derivative assets | Cash flow hedging item (HFH) |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Hedge ratio | 1.00% |  |  |  |  |  | 1.00% |
Derivative assets | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Spread included in fair value of derivative instruments | $ (22,000,000) |  | 163,000,000 |  |  |  |  |
Derivative assets | Currency risk related to long-term debt | Cash flow hedging item (HFH) | European euro |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Spread included in fair value of derivative instruments | 2,000,000 |  | 3,000,000 |  |  |  |  |
Current Asset derivatives |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Current Assets, Fair value and carrying value | $ 65,000,000 | $ 36,000,000 | 36,000,000 | $ 36,000,000 | 36,000,000 | 36,000,000 | $ 36,000,000 | 36,000,000
Current Asset derivatives | Currency risk related to revenues | HFT | U.S. Dollars |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Rate | ₱ / shares | 58 |  |  | 56 |  |  |  |
Current Asset derivatives | Currency risk related to transactions against Pesos | HFT | U.S. Dollars |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2025 | 2024 |  |  |  |  |  |
Current Assets, Notional amount | $ 43,000,000 | $ 111,000,000 | 111,000,000 | $ 111,000,000 | 111,000,000 | 111,000,000 | 111,000,000 | 111,000,000
Current Assets, Fair value and carrying value |  | $ 2,000,000 | 2,000,000 | 2,000,000 | 2,000,000 | 2,000,000 | 2,000,000 | 2,000,000
Current Asset derivatives | Currency risk related to transactions against CAD | HFT | U.S. Dollars |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2025 |  |  |  |  |  |  |
Current Assets, Notional amount | $ 72,000,000 |  |  |  |  |  |  |
Current Assets, Fair value and carrying value | $ 1,000,000 |  |  |  |  |  |  |
Rate | $ / shares | 1.43 |  |  |  |  |  |  |
Current Asset derivatives | Currency risk related to purchases | Cash flow hedging item (HFH) | U.S. Dollars |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2025 | 2024 |  |  |  |  |  |
Current Assets, Notional amount | $ 410,000,000 | $ 47,000,000 | 47,000,000 | 47,000,000 | $ 47,000,000 | 47,000,000 | 47,000,000 | 47,000,000
Current Assets, Fair value and carrying value | $ 20,000,000 |  |  |  |  |  |  |
Rate | $ / $ | 1.36 |  |  |  | 1.31 |  |  |
Current Asset derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2025 | 2024 |  |  |  |  |  |
Current Assets, Notional amount | $ 1,201,000,000 | $ 118,000,000 | 118,000,000 | 118,000,000 | $ 118,000,000 | 118,000,000 | 118,000,000 | 118,000,000
Current Assets, Fair value and carrying value | $ 31,000,000 | $ 1,000,000 | 1,000,000 | 1,000,000 | $ 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000
Rate | 1.4 |  |  |  | 1.31 |  |  |
Current Asset derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | European euro |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2028 | 2027 |  |  |  |  |  |
Current Assets, Notional amount | $ 46,000,000 | $ 45,000,000 | 45,000,000 | 45,000,000 | $ 45,000,000 | 45,000,000 | 45,000,000 | 45,000,000
Current Assets, Fair value and carrying value | $ 13,000,000 | $ 17,000,000 | 17,000,000 | 17,000,000 | 17,000,000 | $ 17,000,000 | 17,000,000 | 17,000,000
Rate | $ / € | 1.09 |  |  |  |  | 1.09 |  |
Current Asset derivatives | Price risk associated with purchase of electrical power | HFT |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date |  | 2047 |  |  |  |  |  |
Current Assets, Fair value and carrying value |  | $ 14,000,000 | 14,000,000 | 14,000,000 | 14,000,000 | $ 14,000,000 | 14,000,000 | $ 14,000,000
Electrical consumption commodity derivative, Notional amount (in TWh) | TWh |  |  |  |  |  |  |  | 0.4
Electrical consumption commodity derivative, Price (CAD/MWh). |  |  | 30.6 |  |  |  |  |
Current Asset derivatives | Interest rate risk associated with non-fixed rate credit facility amounts drawn | Cash flow hedging item (HFH) | 3.5% non-fixed rate credit facility |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2028 | 2024 |  |  |  |  |  |
Current Assets, Notional amount | $ 12,000,000 | $ 11,000,000 | 11,000,000 | 11,000,000 | 11,000,000 | 11,000,000 | 11,000,000 | $ 11,000,000
Current Assets, Fair value and carrying value |  | $ 2,000,000 | $ 2,000,000 | $ 2,000,000 | $ 2,000,000 | $ 2,000,000 | $ 2,000,000 | $ 2,000,000
Interest rate on borrowings | 3.50% | 3.50% | 3.50% | 3.50% | 3.50% | 3.50% | 3.50% | 3.50%
Other Long-Term Asset derivatives |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Other Long-Term Assets, Fair value and carrying value | $ 113,000,000 | $ 179,000,000 | $ 179,000,000 | $ 179,000,000 | $ 179,000,000 | $ 179,000,000 | $ 179,000,000 | $ 179,000,000
Other Long-Term Asset derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2032 |  |  |  |  |  |  |
Rate | $ / shares | 1.32 |  |  |  |  |  |  |
Other Long-Term Assets, Notional amount | $ 3,069,000,000 |  |  |  |  |  |  |
Other Long-Term Assets, Fair value and carrying value | $ 86,000,000 |  |  |  |  |  |  |
Other Long-Term Asset derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | European euro |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2028 |  |  |  |  |  |  |
Rate | € / $ | 1.09 |  |  |  |  |  |  |
Other Long-Term Assets, Notional amount | $ 557,000,000 |  |  |  |  |  |  |
Other Long-Term Assets, Fair value and carrying value | $ 24,000,000 |  |  |  |  |  |  |
Other Long-Term Asset derivatives | Price risk associated with purchase of electrical power | HFT |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date |  | 2047 |  |  |  |  |  |
Other Long-Term Assets, Fair value and carrying value |  | $ 179,000,000 | 179,000,000 | 179,000,000 | 179,000,000 | 179,000,000 | 179,000,000 | $ 179,000,000
Electrical consumption commodity derivative, Notional amount (in TWh) | TWh |  |  |  |  |  |  |  | 6.9
Electrical consumption commodity derivative, Price (CAD/MWh). |  |  | 39.52 |  |  |  |  |
Other Long-Term Asset derivatives | Interest rate risk associated with non-fixed rate credit facility amounts drawn | HFT | 3.5% non-fixed rate credit facility |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2028 |  |  |  |  |  |  |
Other Long-Term Assets, Notional amount | $ 211,000,000 |  |  |  |  |  |  |
Other Long-Term Assets, Fair value and carrying value | $ 3,000,000 |  |  |  |  |  |  |
Interest rate on borrowings | 3.50% |  |  |  |  |  |  |
Current Liabilities derivatives |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Current Liabilities, Fair value and carrying value | $ 11,000,000 | $ 25,000,000 | 25,000,000 | $ 25,000,000 | 25,000,000 | 25,000,000 | 25,000,000 | $ 25,000,000
Current Liabilities derivatives | Currency risk related to transactions against Pesos | HFT | U.S. Dollars |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2025 | 2024 |  |  |  |  |  |
Rate | ₱ / shares | 57 |  |  | 55 |  |  |  |
Current Liabilities, Notional amount | $ 129,000,000 | $ 18,000,000 | $ 18,000,000 | $ 18,000,000 | 18,000,000 | 18,000,000 | 18,000,000 | 18,000,000
Current Liabilities, Fair value and carrying value | $ 3,000,000 |  |  |  |  |  |  |
Current Liabilities derivatives | Currency risk related to purchases | Cash flow hedging item (HFH) | U.S. Dollars |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2025 | 2024 |  |  |  |  |  |
Rate | 1.42 |  | 1.34 |  |  |  |  |
Current Liabilities, Notional amount | $ 30,000,000 | $ 401,000,000 | $ 401,000,000 | 401,000,000 | 401,000,000 | 401,000,000 | 401,000,000 | 401,000,000
Current Liabilities, Fair value and carrying value |  | $ 7,000,000 | $ 7,000,000 | 7,000,000 | 7,000,000 | 7,000,000 | 7,000,000 | 7,000,000
Current Liabilities derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2025 | 2024 |  |  |  |  |  |
Rate | 1.44 |  | 1.35 |  |  |  |  |
Current Liabilities, Notional amount | $ 1,117,000,000 | $ 943,000,000 | $ 943,000,000 | 943,000,000 | 943,000,000 | 943,000,000 | 943,000,000 | 943,000,000
Current Liabilities, Fair value and carrying value | $ 2,000,000 | 18,000,000 | 18,000,000 | 18,000,000 | 18,000,000 | 18,000,000 | 18,000,000 | 18,000,000
Current Liabilities derivatives | Price risk associated with purchase of electrical power | HFT |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Electrical consumption commodity derivative, Notional amount (in TWh) | TWh | 0.4 |  |  |  |  |  |  |
Electrical consumption commodity derivative, Price (CAD/MWh). | $ 31,760,000 |  |  |  |  |  |  |
Current Liabilities derivatives | Price risk associated with purchase of electrical power | HFT |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2047 |  |  |  |  |  |  |
Current Liabilities, Fair value and carrying value | $ 6,000,000 |  |  |  |  |  |  |
Other Long-Term Liabilities derivatives |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Other Long-Term Liabilities, Fair value and carrying value | $ 118,000,000 | $ 191,000,000 | 191,000,000 | 191,000,000 | $ 191,000,000 | $ 191,000,000 | 191,000,000 | 191,000,000
Other Long-Term Liabilities derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2049 | 2049 |  |  |  |  |  |
Rate | 1.3 |  |  |  | 1.31 | 1.09 |  |
Other Long-Term Liabilities, Notional amount | $ 3,378,000,000 | $ 6,610,000,000 | 6,610,000,000 | 6,610,000,000 | $ 6,610,000,000 | $ 6,610,000,000 | 6,610,000,000 | 6,610,000,000
Other Long-Term Liabilities, Fair value and carrying value | $ 86,000,000 | $ 176,000,000 | 176,000,000 | 176,000,000 | 176,000,000 | 176,000,000 | 176,000,000 | 176,000,000
Other Long-Term Liabilities derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | European euro |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date |  | 2027 |  |  |  |  |  |
Other Long-Term Liabilities, Notional amount |  | $ 591,000,000 | 591,000,000 | 591,000,000 | 591,000,000 | 591,000,000 | 591,000,000 | 591,000,000
Other Long-Term Liabilities, Fair value and carrying value |  | $ 13,000,000 | 13,000,000 | 13,000,000 | 13,000,000 | 13,000,000 | 13,000,000 | 13,000,000
Other Long-Term Liabilities derivatives | Price risk associated with purchase of electrical power | HFT |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Electrical consumption commodity derivative, Notional amount (in TWh) | TWh | 6.5 |  |  |  |  |  |  |
Electrical consumption commodity derivative, Price (CAD/MWh). | $ 40,490,000 |  |  |  |  |  |  |
Other Long-Term Liabilities derivatives | Interest rate risk associated with non-fixed rate credit facility amounts drawn | Cash flow hedging item (HFH) |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date | 2047 |  |  |  |  |  |  |
Other Long-Term Liabilities, Fair value and carrying value | $ 32,000,000 |  |  |  |  |  |  |
Other Long-Term Liabilities derivatives | Interest rate risk associated with non-fixed rate credit facility amounts drawn | HFT | 3.6% non-fixed rate credit facility |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments |  |  |  |  |  |  |  |
Maximum maturity date |  | 2028 |  |  |  |  |  |
Other Long-Term Liabilities, Notional amount |  | $ 205,000,000 | 205,000,000 | 205,000,000 | 205,000,000 | 205,000,000 | 205,000,000 | 205,000,000
Other Long-Term Liabilities, Fair value and carrying value |  | $ 2,000,000 | $ 2,000,000 | $ 2,000,000 | $ 2,000,000 | $ 2,000,000 | $ 2,000,000 | $ 2,000,000
Interest rate on borrowings |  | 3.60% | 3.60% | 3.60% | 3.60% | 3.60% | 3.60% | 3.60%

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- Definition The notional amount of the electrical consumption commodity derivative to purchase solar energy, expressed in megawatt hours (MWh). + References No definition available. + Details
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