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Income Taxes - Income Tax Effect of Temporary Differences (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Personnel accruals | $ 2 | $ 0
State tax credit carryforward, net | 20 | 7
Net operating loss carryforward | 9 | 0
Total gross deferred income tax assets | 31 | 7
Deferred income tax liabilities: |  |
Other | (3) | (1)
Total gross deferred income tax liabilities | (399) | (403)
Net deferred income tax liabilities | (368) | (396)
CVR Partners |  |
Deferred income tax liabilities: |  |
Unrealized gain | (9) | 0
Investment in CVR Partners and CVR Refining | (67) | (61)
CVR Refining |  |
Deferred income tax liabilities: |  |
Investment in CVR Partners and CVR Refining | $ (320) | $ (341)

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