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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Components Of Deferred Tax Assets And Liabilities [Line Items] |  |  |
Allowances and operating liabilities | $ 368 | $ 331 | $ 344
Net operating loss carry forwards | 25 | 14 | 10
Post retirement benefits | 54 | 14 | 17
Foreign tax credit carry forwards | 259 | 106 | 220
Other | 149 | 151 | 75
Deferred Tax Assets, Gross, Total | 855 | 616 | 666
Valuation allowance for deferred tax assets | (93) | (13) | (9)
Total deferred tax assets | 762 | 603 | 657
Deferred tax liabilities: |  |  |
Tax over book depreciation | 268 | 204 | 213
Intangible assets | 1,448 | 1,398 | 1,307
Deferred income | 314 | 226 | 456
Accrued U.S. tax on unremitted earnings | 92 | 70 | 149
Other | 208 | 168 | 211
Total deferred tax liabilities | 2,330 | 2,066 | 2,336
Net deferred tax liability | $ 1,568 | $ 1,463 | $ 1,679

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 11 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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