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Income Taxes, Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred income tax assets: |  |
Tax credit carryforwards | $ 858 | $ 809
Net operating losses (NOLs) | 689 | 710
Inventories | 197 | 237
Finance lease obligations | 317 | 314
Operating lease liabilities | 502 | 519
Other | 195 | 221
Total deferred income tax assets | 2,758 | 2,810
Valuation allowance | (1,484) | (1,383)
Net deferred income tax assets | 1,274 | 1,427
Deferred income tax liabilities: |  |
Property, plant, and equipment | 4,875 | 5,121
Deferred turnaround costs | 450 | 399
Operating lease ROU assets | 467 | 546
Investments | 417 | 423
Other | 332 | 287
Total deferred income tax liabilities | 6,541 | 6,776
Net deferred income tax liabilities | $ 5,267 | $ 5,349

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