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v2.4.1.9

Income Tax - Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Disclosure [Abstract] |  |
Tax loss carryforwards and investment credits | $ 908us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 658us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Less unrecognized tax benefit | (238)stm_UnrecognizedTaxBenefitsAgainstExistingNetOperatingLosses | (229)stm_UnrecognizedTaxBenefitsAgainstExistingNetOperatingLosses
Tax loss carryforward net of unrecognized tax benefit | 670stm_UnrecognizedTaxBenefitsResultingInNetOperatingLossesCarryforward | 429stm_UnrecognizedTaxBenefitsResultingInNetOperatingLossesCarryforward
Inventory valuation | 15us-gaap_DeferredTaxAssetsInventory | 14us-gaap_DeferredTaxAssetsInventory
Impairment and restructuring charges | 16us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges | 63us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges
Fixed asset depreciation in arrears | 39us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther | 58us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Capitalized development costs | 63stm_DeferredTaxAssetsCapitalizedDevelopmentCosts | 45stm_DeferredTaxAssetsCapitalizedDevelopmentCosts
Receivables for government funding | 13us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities | 22us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities
Tax credits granted on past capital investments | 1,147us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 1,131us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Pension service costs | 82us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions | 66us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Stock awards | 5us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 2us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Commercial accruals | 15us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther | 10us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Other temporary differences | 78us-gaap_DeferredTaxAssetsOther | 70us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 2,143us-gaap_DeferredTaxAssetsGross | 1,910us-gaap_DeferredTaxAssetsGross
Valuation allowances | (1,607)us-gaap_DeferredTaxAssetsValuationAllowance | (1,454)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net | 536us-gaap_DeferredTaxAssetsNet | 456us-gaap_DeferredTaxAssetsNet
Accelerated fixed asset depreciation | (26)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (58)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Acquired intangible assets | (11)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | (11)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Advances of government funding | (23)us-gaap_DeferredTaxLiabilitiesRegulatoryAssets | (35)us-gaap_DeferredTaxLiabilitiesRegulatoryAssets
Other temporary differences | (3)us-gaap_DeferredTaxLiabilitiesOther | (13)us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liabilities | (63)us-gaap_DeferredTaxLiabilities | (117)us-gaap_DeferredTaxLiabilities
Net deferred income tax asset | $ 473us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 339us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + References Reference 1: 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 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits. + References Reference 1: 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 2: 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 3: 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=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. + References Reference 1: 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 2: 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 3: 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=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other provisions, reserves, allowances, and accruals not separately disclosed. + References Reference 1: 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 2: 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=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 Reference 4: 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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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from restructuring reserve. + References Reference 1: 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 2: 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 3: 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=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. + References Reference 1: 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 2: 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=29652012&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 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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