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Financial Instruments and Risk Management - Schedule of Financial Assets (Liabilities) Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ 281stm_FinancialAssetsLiabilitiesFairValueDisclosure	$ 115stm_FinancialAssetsLiabilitiesFairValueDisclosure
U.S.Treasury Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities issued by foreign governments	334us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasuryBondSecuritiesMember
Available-for-Sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities issued by foreign governments	11us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember	11us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities issued by foreign governments	8us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember	8us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember
Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments designated as cash flow hedge	(71)us-gaap_DerivativeAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_CashFlowHedgingMember	38us-gaap_DerivativeAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_CashFlowHedgingMember
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments designated as cash flow hedge	(1)us-gaap_DerivativeAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_NondesignatedMember	1us-gaap_DerivativeAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_NondesignatedMember
Euro Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities issued by foreign governments		27us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = stm_EuroDenominatedSeniorDebtFloatingRateNotesIssuedByOtherFinancialInstitutionsMember
U.S.-Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities issued by foreign governments		30us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = stm_UnitedStatesDenominatedSeniorDebtFloatingRateNotesIssuedByOtherFinancialInstitutionsMember
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	353stm_FinancialAssetsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	76stm_FinancialAssetsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 [Member] | U.S.Treasury Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities issued by foreign governments	334us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasuryBondSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 [Member] | Available-for-Sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities issued by foreign governments	11us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	11us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities issued by foreign governments	8us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	8us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 [Member] | Euro Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities issued by foreign governments		27us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = stm_EuroDenominatedSeniorDebtFloatingRateNotesIssuedByOtherFinancialInstitutionsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 [Member] | U.S.-Denominated Senior Debt Floating Rate Notes Issued by Other Financial Institutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities issued by foreign governments		30us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = stm_UnitedStatesDenominatedSeniorDebtFloatingRateNotesIssuedByOtherFinancialInstitutionsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	(72)stm_FinancialAssetsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	39stm_FinancialAssetsLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments designated as cash flow hedge	(71)us-gaap_DerivativeAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_CashFlowHedgingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	38us-gaap_DerivativeAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_CashFlowHedgingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments designated as cash flow hedge	$ (1)us-gaap_DerivativeAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_NondesignatedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	$ 1us-gaap_DerivativeAssets / us-gaap_FairValueByAssetClassAxis = us-gaap_NondesignatedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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Financial assets liabilities, fair value disclosure.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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