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Income Taxes, Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred income tax assets: |  |
Tax credit carryforwards | $ 679 | $ 681
NOLs | 697 | 678
Inventories | 217 | 70
Compensation and employee benefit liabilities | 123 | 199
Environmental liabilities | 53 | 64
Other | 149 | 128
Total deferred income tax assets | 1,918 | 1,820
Valuation allowance | (1,262) | (1,223)
Net deferred income tax assets | 656 | 597
Deferred income tax liabilities: |  |
Property, plant, and equipment | 4,866 | 4,895
Deferred turnaround costs | 308 | 302
Inventories | 191 | 269
Investments | 268 | 171
Other | 233 | 235
Total deferred income tax liabilities | 5,866 | 5,872
Net deferred income tax liabilities | $ 5,210 | $ 5,275

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