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Income Taxes - Significant Components of Defered Tax Assets and Liability (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Deferred tax assets: |  |  |
Allowances and operating liabilities | $ 439 | $ 368 | $ 331
Net operating loss carryforwards | 51 | 25 | 14
Postretirement benefits | 49 | 54 | 14
Foreign tax credit carryforwards | 300 | 259 | 106
Other | 39 | 149 | 151
Defered tax assets gross | 878 | 855 | 616
Valuation allowance for deferred tax assets | (133) | (93) | (13)
Total deferred tax assets | 745 | 762 | 603
Deferred tax liabilities: |  |  |
Tax over book depreciation | 306 | 268 | 204
Intangible assets | 1,757 | 1,448 | 1,398
Deferred income | 285 | 314 | 226
Accrued U.S. tax on unremitted earnings | 92 | 92 | 70
Other | 164 | 208 | 168
Total deferred tax liabilities | 2,604 | 2,330 | 2,066
Net deferred tax liability | $ 1,859 | $ 1,568 | $ 1,463

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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