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Financial and Derivative Instruments - Effect of Derivatives (Details) - Commodity - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |  |  |
Effect of derivatives, gain (loss), net | $ (630) | $ 69 | $ (646) | $ (1,118)
Sales and other operating revenues |  |  |  |
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |  |  |
Effect of derivatives, gain (loss), net | (420) | 55 | (439) | (892)
Purchased crude oil and products |  |  |  |
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |  |  |
Effect of derivatives, gain (loss), net | (202) | 24 | (183) | (210)
Other income |  |  |  |
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments |  |  |  |
Effect of derivatives, gain (loss), net | $ (8) | $ (10) | $ (24) | $ (16)

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