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Inventories - Schedule of Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Inventory Disclosure [Abstract] |  |
Crude oil | $ 824 | $ 799
Other raw materials and unfinished products | 751 | 656
Finished products | 1,257 | 1,329
Lower of cost or market reserve | (320) | (289)
Crude oil and refined products | 2,512 | 2,495
Process chemicals | 52 | 43
Repair and maintenance supplies and other | 250 | 260
Materials, supplies and other | 302 | 303
Total inventories | $ 2,814 | $ 2,798

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