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Derivatives and Risk Management Activities - Financial Impact (Details) - Derivatives Not Designated as a Hedge - Commodity derivatives - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Impact of derivative activities recognized in earnings |  |  |  |
Net income/(loss) from commodity derivative activity | $ 17 | $ (35) | $ 107 | $ (38)
Location, Statement of Income, Balance [Axis]: us-gaap:OperatingCostsAndExpenses |  |  |  |
Impact of derivative activities recognized in earnings |  |  |  |
Net income/(loss) from commodity derivative activity | 0 | 5 | 2 | 3
Location, Statement of Income, Balance [Axis]: us-gaap:Revenues |  |  |  |
Impact of derivative activities recognized in earnings |  |  |  |
Net income/(loss) from commodity derivative activity | $ 17 | $ (40) | $ 105 | $ (41)

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