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Income Taxes - Significant Components of Deferred Tax Assets and Liability (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Deferred tax assets: |  |  |
Allowances and operating liabilities | $ 491 | $ 542 | $ 439
Net operating loss carryforwards | 170 | 118 | 51
Postretirement benefits | 79 | 79 | 49
Foreign tax credit carryforwards | 166 | 244 | 300
Other | 21 | 15 | 39
Deferred tax assets gross | 927 | 998 | 878
Valuation allowance for deferred tax assets | (63) | (48) | (133)
Total deferred tax assets | 864 | 950 | 745
Deferred tax liabilities: |  |  |
Tax over book depreciation | 277 | 236 | 306
Intangible assets | 1,323 | 1,304 | 1,757
Deferred income | 232 | 257 | 285
Accrued U.S. tax on unremitted earnings | 55 | 107 | 92
Other | 209 | 377 | 164
Total deferred tax liabilities | 2,096 | 2,281 | 2,604
Net deferred tax liability | $ 1,232 | $ 1,331 | $ 1,859

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