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Income Taxes - Income Tax Effect of Temporary Differences (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Deferred income tax assets: |  |
State tax credit carryforward, net | $ 11 | $ 11
Net operating loss carryforward | 0 | 7
Total gross deferred income tax assets | 11 | 18
Deferred income tax liabilities: |  |
Other | (5) | (4)
Total gross deferred income tax liabilities | (373) | (404)
Net deferred income tax liabilities | (362) | (386)
CVR Partners |  |
Deferred income tax liabilities: |  |
Investment in CVR Partners and CVR Refining | (59) | (55)
CVR Refining |  |
Deferred income tax liabilities: |  |
Investment in CVR Partners and CVR Refining | $ (309) | $ (345)

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