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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Impact of derivative activities recognized in earnings |  |  |  |
Net gain/ (loss) from commodity derivative activity | $ 125 | $ 84 | $ 105 | $ (115)
Product sales revenues |  |  |  |
Impact of derivative activities recognized in earnings |  |  |  |
Net gain/ (loss) from commodity derivative activity | 119 | 76 | 118 | (136)
Field operating costs |  |  |  |
Impact of derivative activities recognized in earnings |  |  |  |
Net gain/ (loss) from commodity derivative activity | $ 6 | $ 8 | $ (13) | $ 21

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