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Income Taxes - Significant Components of Deferred Tax Assets and Liability (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Allowances and operating liabilities | $ 293 | $ 355
Net operating loss carryforwards | 182 | 182
Postretirement benefits | 30 | 31
Tax credit carryforwards | 768 | 1,002
Other | 95 | 78
Valuation allowance | (955) | (1,202)
Total deferred tax assets | 413 | 446
Deferred tax liabilities: |  |
Tax over book depreciation | 139 | 174
Intangible assets | 688 | 716
Deferred income | 70 | 111
Accrued tax on unremitted earnings | 17 | 17
Other | 52 | 92
Total deferred tax liabilities | 966 | 1,110
Net deferred tax liability | $ 553 | $ 664

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