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financial instruments - Fair Values Derivatives (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2026 CAD ($) $ / $ ₱ / $ $ / € TWh $ / MWh | Dec. 31, 2025 CAD ($) $ / € $ / $ ₱ / $ TWh $ / MWh
financial instruments |  |
Current Assets, Fair value and carrying value | $ 142 | $ 8
Current Liabilities, Fair value and carrying value | $ 21 | $ 30
Derivative assets | Cash flow hedges |  |
financial instruments |  |
Hedge ratio | 1.00% | 1.00%
Derivative assets | Currency risk related to long-term debt | Cash flow hedges | U.S. Dollars |  |
financial instruments |  |
Spread included in fair value of derivative instruments | $ (24) | $ (22)
Current derivative assets |  |
financial instruments |  |
Current Assets, Fair value and carrying value | 142 | $ 8
Current derivative assets | Currency risk related to transactions against Pesos | HFT | U.S. Dollars |  |
financial instruments |  |
Maximum maturity date |  | 2026
Current Assets, Notional amount | $ 26 | $ 30
Rate | ₱ / $ | 66 | 59
Current derivative assets | Currency risk related to transactions against CAD | Cash flow hedges | U.S. Dollars |  |
financial instruments |  |
Maximum maturity date | 2027 | 2026
Current Assets, Notional amount | $ 528 | $ 134
Current Assets, Fair value and carrying value | $ 18 | $ 1
Rate | $ / $ | 1.36 | 1.35
Current derivative assets | Currency risk related to transactions against CAD | HFT | U.S. Dollars |  |
financial instruments |  |
Rate | $ / $ | 1.36 |
Current derivative assets | Currency risk related to transactions against USD | HFT | European euro |  |
financial instruments |  |
Maximum maturity date | 2028 | 2028
Current Assets, Notional amount | $ 48 | $ 33
Current Assets, Fair value and carrying value | $ 10 | $ 6
Rate | $ / € | 1.09 | 1.09
Current derivative assets | Currency risk related to long-term debt | Cash flow hedges | U.S. Dollars |  |
financial instruments |  |
Maximum maturity date | 2027 | 2026
Current Assets, Notional amount | $ 3,184 | $ 1,170
Current Assets, Fair value and carrying value | $ 114 | $ 1
Rate | $ / $ |  | 1.37
Other long-term assets | Currency risk related to long-term debt | Cash flow hedges | U.S. Dollars |  |
financial instruments |  |
Maximum maturity date | 2055 | 2055
Rate | $ / $ | 1.31 | 1.32
Other Long-Term Assets, Notional amount | $ 6,550 | $ 4,219
Other Long-Term Assets, Fair value and carrying value | 87 | 40
Current derivative liabilities |  |
financial instruments |  |
Current Liabilities, Fair value and carrying value | $ 21 | $ 30
Current derivative liabilities | Currency risk related to transactions against Pesos | HFT | U.S. Dollars |  |
financial instruments |  |
Maximum maturity date | 2027 | 2026
Rate | ₱ / $ | 59 | 58
Current Liabilities, Notional amount | $ 257 | $ 254
Current Liabilities, Fair value and carrying value | $ 11 | $ 6
Current derivative liabilities | Currency risk related to transactions against CAD | Cash flow hedges | U.S. Dollars |  |
financial instruments |  |
Maximum maturity date | — | 2026
Rate | $ / $ |  | 1.39
Current Liabilities, Notional amount |  | $ 374
Current Liabilities, Fair value and carrying value |  | $ 7
Current derivative liabilities | Currency risk related to long-term debt | Cash flow hedges | U.S. Dollars |  |
financial instruments |  |
Maximum maturity date | 2026 | 2026
Rate | $ / $ | 1.42 | 1.39
Current Liabilities, Notional amount | $ 923 | $ 733
Current Liabilities, Fair value and carrying value |  | $ 10
Current derivative liabilities | Other price risk associated with purchase of electrical power | Cash flow hedges |  |
financial instruments |  |
Maximum maturity date | 2047 | 2047
Current Liabilities, Fair value and carrying value | $ 10 | $ 7
Electrical consumption commodity derivative, Notional amount (in TWh) | TWh | 0.3 | 0.3
Electrical consumption commodity derivative, Price (CAD/MWh). | $ / MWh | 26.51 | 32.41
Other long-term liabilities |  |
financial instruments |  |
Other Long-Term Liabilities, Fair value and carrying value | $ 112 | $ 167
Other long-term liabilities | Currency risk related to transactions against USD | HFT | European euro |  |
financial instruments |  |
Maximum maturity date | 2028 | 2028
Rate | $ / € | 1.09 | 1.09
Other Long-Term Liabilities, Notional amount | $ 533 | $ 568
Other Long-Term Liabilities, Fair value and carrying value | $ 30 | $ 44
Other long-term liabilities | Currency risk related to long-term debt | Cash flow hedges | U.S. Dollars |  |
financial instruments |  |
Maximum maturity date | 2056 | 2056
Rate | $ / $ | 1.35 | 1.33
Other Long-Term Liabilities, Notional amount | $ 3,990 | $ 7,332
Other Long-Term Liabilities, Fair value and carrying value | $ 46 | $ 102
Other long-term liabilities | Other price risk associated with purchase of electrical power | Cash flow hedges |  |
financial instruments |  |
Maximum maturity date | 2047 | 2047
Other Long-Term Liabilities, Fair value and carrying value | $ 36 | $ 21
Electrical consumption commodity derivative, Notional amount (in TWh) | TWh | 4.7 | 4.9
Electrical consumption commodity derivative, Price (CAD/MWh). | $ / MWh | 41.63 | 40.92

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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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