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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Deferred tax assets: |  |  |
Allowances and operating liabilities | $ 3 | $ 5 | $ 8
Net operating loss carryforwards | 79 | 56 | 56
Foreign tax credit carryforwards | 7 | 7 | 8
Allowance for doubtful accounts | 5 | 2 | 6
Inventory reserve | 13 | 9 | 10
Stock-based compensation | 6 | 8 | 8
Intangible assets | 66 | 28 | 24
Assets held-for-sale |  | 4 |
Investment in subsidiaries |  | 9 |
Capital Loss Carryforward | 11 |  |
Book over tax depreciation | 5 | 4 | 2
Other | 5 | 4 | 3
Total deferred tax assets | 200 | 136 | 125
Deferred tax liabilities: |  |  |
Net deferred tax assets before valuation allowance | 200 | 136 | 125
Valuation allowance | (199) | (138) | (129)
Net deferred tax assets | $ 1 |  |
Net deferred tax liabilities |  | $ (2) | $ (4)

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