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Income Tax - Gross Deferred Tax Assets on Tax Loss Carryforwards and Investment Credits Expiration (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Disclosure [Abstract] |  |
2015 | $ 1stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationYearOne |
2016 | 46stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationYearTwo |
2017 | 12stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationYearThree |
2018 | 89stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationYearFour |
2019 | 77stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationYearFive |
Thereafter | 683stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationThereafter |
Total | $ 908us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 658us-gaap_DeferredTaxAssetsOperatingLossCarryforwards

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- Definition Deferred tax assets on tax loss carryforwards and investment credits expiration Thereafter. + References No definition available. + Details
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- Definition Deferred Tax Assets On Tax Loss Carryforwards And Investment Credits Expiration Year Five + References No definition available. + Details
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- Definition Deferred tax assets on tax loss carryforwards and investment credits expiration Year Four. + References No definition available. + Details
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- Definition Deferred tax assets on tax loss carryforwards and investment credits expiration. + References No definition available. + Details
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- Definition Deferred tax assets on tax loss carryforwards and investment credits expiration Year Three. + References No definition available. + Details
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- Definition Deferred tax assets on tax loss carryforwards and investment credits expiration Year Two. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss 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 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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