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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) $ in Millions, $ in Billions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) $ / $ | Jun. 30, 2025 CAD ($) $ / $ | Dec. 31, 2024 USD ($)
Recurring Fair Value Measures |  |  |
Derivatives and Risk Management Activities |  |  |
Fair value, liability | $ (7) |  | $ 24
Foreign currency derivatives |  |  |
Derivatives and Risk Management Activities |  |  |
Notional amount of derivatives |  | $ 4.5 |
Gain (loss) on derivatives recognized in net income | $ (49) |  |
Average fixed exchange rate (cad per usd) | $ / $ | 1.37 | 1.37 |
Average exchange rate (cad per usd) | $ / $ | 1.35 | 1.35 |
Foreign currency derivatives | Recurring Fair Value Measures |  |  |
Derivatives and Risk Management Activities |  |  |
Fair value, liability | $ (49) |  | $ 0

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