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Income Taxes, Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred income tax assets: |  |
Tax credit carryforwards | $ 809 | $ 660
NOLs | 710 | 642
Inventories | 237 | 326
Compensation and employee benefit liabilities | 32 | 44
Environmental liabilities | 59 | 57
Finance lease obligations | 314 | 309
Operating lease liabilities | 519 | 512
Other | 130 | 186
Total deferred income tax assets | 2,810 | 2,736
Valuation allowance | (1,383) | (1,234)
Net deferred income tax assets | 1,427 | 1,502
Deferred income tax liabilities: |  |
Property, plant, and equipment | 5,121 | 5,022
Deferred turnaround costs | 399 | 369
Operating lease ROU assets | 546 | 507
Inventories | 106 | 234
Investments | 423 | 431
Other | 181 | 156
Total deferred income tax liabilities | 6,776 | 6,719
Net deferred income tax liabilities | $ 5,349 | $ 5,217

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