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Income Taxes, Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Tax credit carryforwards | $ 681 | $ 683
Net operating losses (NOLs) | 678 | 582
Inventories | 70 | 141
Compensation and employee benefit liabilities | 199 | 213
Environmental liabilities | 64 | 69
Other | 128 | 156
Total deferred income tax assets | 1,820 | 1,844
Valuation allowance | (1,223) | (1,200)
Net deferred income tax assets | 597 | 644
Deferred income tax liabilities: |  |
Property, plant, and equipment | 4,895 | 4,924
Deferred turnaround costs | 302 | 331
Inventories | 269 | 217
Investments | 171 | 122
Other | 235 | 153
Total deferred income tax liabilities | 5,872 | 5,747
Net deferred income tax liabilities | $ 5,275 | $ 5,103

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