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Income Taxes - Significant Components of Deferred Tax Assets and Liability (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Allowances and operating liabilities | $ 534 | $ 491
Net operating loss carryforwards | 153 | 170
Postretirement benefits | 60 | 79
Tax credit carryforwards | 405 | 166
Other | 164 | 21
Valuation allowance | (544) | (63)
Total deferred tax assets | 772 | 864
Deferred tax liabilities: |  |
Tax over book depreciation | 267 | 277
Intangible assets | 1,148 | 1,323
Deferred income | 185 | 232
Accrued U.S. tax on unremitted earnings | 53 | 55
Other | 97 | 209
Total deferred tax liabilities | 1,750 | 2,096
Net deferred tax liability | $ 978 | $ 1,232

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