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Financial Instruments and Derivatives - Derivative Instruments (Details) - Not Designated As Hedging Instrument, Trading [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Realized and Unrealized Before-Tax Gain / Loss on Derivative Instruments Recognized in the Consolidated Statement of Income |  |  |
Total | $ (658) | $ 1,065 | $ (1,449)
Sales and other operating revenue |  |  |
Realized and Unrealized Before-Tax Gain / Loss on Derivative Instruments Recognized in the Consolidated Statement of Income |  |  |
Total | (661) | 986 | (1,763)
Crude oil and product purchases |  |  |
Realized and Unrealized Before-Tax Gain / Loss on Derivative Instruments Recognized in the Consolidated Statement of Income |  |  |
Total | $ 3 | $ 79 | $ 314

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