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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
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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