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Financial Instruments and Risk Management - Schedule of Assets (Liabilities) Measured at Fair Value on Non-Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (Fair Value, Inputs, Level 3 [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held for sale | $ 11stm_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetAssetsHeldForSale |
Sale of assets | (5)stm_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetSales |
Deconsolidation of assets | (6)stm_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetDeconsolidationOfAssets |
Veredus asset group | 16stm_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetPurchases |
Ending balance | 16stm_FairValueMeasurementWithUnobservableInputsReconciliationNonecurringBasisAssetValue |
Amount of total losses for the period included in earnings attributable to assets still held at the reporting date | (5)stm_FairValueMeasurementWithUnobservableInputsReconciliationNonRecurringBasisAssetStillHeldGainLossIncludedInEarningsAtReportingDate | (3)stm_FairValueMeasurementWithUnobservableInputsReconciliationNonRecurringBasisAssetStillHeldGainLossIncludedInEarningsAtReportingDate
Veredus [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Sale of assets |  | (16)stm_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetSales / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = stm_VeredusMember
Veredus cost-method investment |  | 3stm_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisCostMethodInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = stm_VeredusMember
Other-then-temporary impairment on Veredus cost-method investment |  | $ (3)stm_FairValueMeasurementWithUnobservableInputsReconciliationNonRecurringBasisOtherThanTemporaryImpairmentOnEquitySecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = stm_VeredusMember

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Nonecurring Basis Asset Value + References No definition available. + Details
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Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Nonrecurring Basis Asset Assets Held For Sale + References No definition available. + Details
Name: | stm_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetAssetsHeldForSale
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Nonrecurring Basis Asset Deconsolidation of assets + References No definition available. + Details
Name: | stm_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetDeconsolidationOfAssets
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Nonrecurring Basis Asset Purchases + References No definition available. + Details
Name: | stm_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetPurchases
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Nonrecurring Basis Asset Sales + References No definition available. + Details
Name: | stm_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetSales
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fair value measurement with unobservable inputs reconciliation non recurring basis asset still held gain loss included in earnings at reporting date. + References No definition available. + Details
Name: | stm_FairValueMeasurementWithUnobservableInputsReconciliationNonRecurringBasisAssetStillHeldGainLossIncludedInEarningsAtReportingDate
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value measurement with unobservable inputs reconciliation nonrecurring basis cost method investments. + References No definition available. + Details
Name: | stm_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisCostMethodInvestments
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Non Recurring Basis Other than temporary impairment on equity securities. + References No definition available. + Details
Name: | stm_FairValueMeasurementWithUnobservableInputsReconciliationNonRecurringBasisOtherThanTemporaryImpairmentOnEquitySecurities
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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