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Income Taxes - Significant Components of Deferred Tax Assets and Liability (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Allowances and operating liabilities | $ 355 | $ 534
Net operating loss carryforwards | 182 | 153
Postretirement benefits | 31 | 60
Tax credit carryforwards | 1,002 | 405
Other | 78 | 164
Valuation allowance | (1,202) | (544)
Total deferred tax assets | 446 | 772
Deferred tax liabilities: |  |
Tax over book depreciation | 174 | 267
Intangible assets | 716 | 1,148
Deferred income | 111 | 185
Accrued tax on unremitted earnings | 17 | 53
Other | 92 | 97
Total deferred tax liabilities | 1,110 | 1,750
Net deferred tax liability | $ 664 | $ 978

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