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Accounting Policies - Actual Past and Expected Future Revenues for Multiple Deliverable Arrangements (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |
Licenses and process documentation | $ 9 | $ 56 | $ 29
Training and support services | 9 | 14 | 28
Total Revenues under Multiple Deliverable Arrangements | 18 | 70 | 57
Licenses and process documentation, 2013 |  |  |
Training and support services, 2013 | 2 |  |
Total Revenue from Multiple Deliverable Agreements, 2013 | $ 2 |  |

X
- Definition Expected license and services revenue, year one. + References No definition available. + Details
Name: | stm_ExpectedLicenseAndServicesRevenueYearOne
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Expected revenue from multiple deliverable agreements year one. + References No definition available. + Details
Name: | stm_ExpectedRevenueFromMultipleDeliverableAgreementsYearOne
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Expected training and support services, year one. + References No definition available. + Details
Name: | stm_ExpectedTrainingAndSupportServicesYearOne
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revenue from multiple deliverable agreements. + References No definition available. + Details
Name: | stm_RevenueFromMultipleDeliverableAgreements
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Training and support services. + References No definition available. + Details
Name: | stm_TrainingAndSupportServices
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revenue from multiple-deliverable arrangements that include licensing fees and services revenue. Licensing revenue is consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Services revenue may be derived by providing other, nonspecified, services during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d),(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
Name: | us-gaap_LicenseAndServicesRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RevenueRecognitionMultipleDeliverableArrangementsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration