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Income Tax - Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Tax loss carryforwards and investment credits | $ 820 | $ 643
Inventory valuation | 24 | 23
Impairment and restructuring charges | 61 | 56
Fixed asset depreciation in arrears | 75 | 56
Receivables for government funding | 15 | 13
Tax credits granted on past capital investments | 1,114 | 1,111
Pension service costs | 97 | 71
Stock awards |  | 7
Commercial accruals | 10 | 13
Other temporary differences | 98 | 131
Total deferred tax assets | 2,314 | 2,124
Valuation allowances | (1,634) | (1,514)
Deferred tax assets, net | 680 | 610
Accelerated fixed asset depreciation | (64) | (69)
Acquired intangible assets | (30) | (49)
Advances of government funding | (26) | (16)
Other temporary differences | (34) | (38)
Deferred tax liabilities | (154) | (172)
Net deferred income tax asset | $ 526 | $ 438

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from regulatory assets. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 11 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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 Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 5: 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. + Details
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