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Income Taxes, Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets: |  |
Tax credit carryforwards | $ 69 | $ 65
Net operating losses (NOLs) | 492 | 374
Inventories | 135 | 93
Compensation and employee benefit liabilities | 179 | 344
Environmental liabilities | 47 | 69
Other | 112 | 100
Total deferred income tax assets | 1,034 | 1,045
Valuation allowance | (498) | (374)
Net deferred income tax assets | 536 | 671
Deferred income tax liabilities: |  |
Property, plant, and equipment | 4,545 | 6,900
Deferred turnaround costs | 272 | 450
Inventories | 243 | 356
Investments | 77 | 253
Other | 107 | 73
Total deferred income tax liabilities | 5,244 | 8,032
Net deferred income tax liabilities | $ 4,708 | $ 7,361

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