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Shareholders' Equity - Summary of Grants under Outstanding Stock Award Plans (Detail) | 12 Months Ended
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Dec. 31, 2014
Employees [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Awards granted, Number of shares | 6,959,210us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
Employees [Member] | Employee Plan 2014 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Awards granted, Number of shares | 6,959,210us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandFourteenMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
2005 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2005
Options granted and vested | 66,000stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod / us-gaap_AwardTypeAxis = stm_TwoThousandFiveMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
Options waived at grant | (15,000)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesWaived / us-gaap_AwardTypeAxis = stm_TwoThousandFiveMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
2006 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2006
Options granted and vested | 66,000stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod / us-gaap_AwardTypeAxis = stm_TwoThousandSixMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
Options waived at grant | (15,000)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesWaived / us-gaap_AwardTypeAxis = stm_TwoThousandSixMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
2007 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2007
Options granted and vested | 165,000stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod / us-gaap_AwardTypeAxis = stm_TwoThousandSevenMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
Options waived at grant | (22,500)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesWaived / us-gaap_AwardTypeAxis = stm_TwoThousandSevenMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
2008 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2008
Options granted and vested | 165,000stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod / us-gaap_AwardTypeAxis = stm_TwoThousandEightMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
Options waived at grant | (22,500)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesWaived / us-gaap_AwardTypeAxis = stm_TwoThousandEightMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
2009 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2009
Options granted and vested | 165,000stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod / us-gaap_AwardTypeAxis = stm_TwoThousandNineMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
Options waived at grant | (7,500)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesWaived / us-gaap_AwardTypeAxis = stm_TwoThousandNineMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
2010 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2010
Options granted and vested | 172,500stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod / us-gaap_AwardTypeAxis = stm_TwoThousandTenMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
Options waived at grant | (7,500)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesWaived / us-gaap_AwardTypeAxis = stm_TwoThousandTenMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
2011 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2011
Options granted and vested | 172,500stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod / us-gaap_AwardTypeAxis = stm_TwoThousandElevenMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
Options waived at grant | (30,000)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesWaived / us-gaap_AwardTypeAxis = stm_TwoThousandElevenMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
2012 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2012
Options granted and vested | 180,000stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod / us-gaap_AwardTypeAxis = stm_TwoThousandTwelveMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
Options waived at grant | (22,500)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesWaived / us-gaap_AwardTypeAxis = stm_TwoThousandTwelveMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
2013 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2013
Options granted and vested | 0stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod / us-gaap_AwardTypeAxis = stm_TwoThousandThirteenMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
Options waived at grant | 0stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesWaived / us-gaap_AwardTypeAxis = stm_TwoThousandThirteenMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
2014 [Member] | Supervisory Board [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Year of grant | 2014
Options granted and vested | 0stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod / us-gaap_AwardTypeAxis = stm_TwoThousandFourteenMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
Options waived at grant | 0stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesWaived / us-gaap_AwardTypeAxis = stm_TwoThousandFourteenMember / us-gaap_TitleOfIndividualAxis = stm_SupervisoryBoardMember
May 30, 2012 [Member] | Employees [Member] | 2012 CEO Special Bonus [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | May 30, 2012
Awards granted, Number of shares | 100,862us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = stm_ThirtyMayTwoThousandTwelveMember / us-gaap_PlanNameAxis = stm_TwoThousandTwelveChiefExecutiveOfficerSpecialBonusMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
July 23, 2012 [Member] | Employees [Member] | Employee Plan 2012 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jul. 23, 2012
Awards granted, Number of shares | 6,216,285us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = stm_TwentyThreeJulyTwoThousandTwelveMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandTwelveMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
Options waived at grant | (2,400)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesWaived / us-gaap_AwardTypeAxis = stm_TwentyThreeJulyTwoThousandTwelveMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandTwelveMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
Share based compensation arrangement by share based payment award, Number of shares lost on performance | (1,991,558)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesLostOnPerformance / us-gaap_AwardTypeAxis = stm_TwentyThreeJulyTwoThousandTwelveMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandTwelveMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
December 21, 2012 [Member] | Employees [Member] | Employee Plan 2012 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Dec. 21, 2012
Awards granted, Number of shares | 304,480us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = stm_TwentyOneDecemberTwoThousandTwelveMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandTwelveMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
Share based compensation arrangement by share based payment award, Number of shares lost on performance | (100,373)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesLostOnPerformance / us-gaap_AwardTypeAxis = stm_TwentyOneDecemberTwoThousandTwelveMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandTwelveMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
July 22, 2013 [Member] | Employees [Member] | 2013 CEO Special Bonus [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jul. 22, 2013
Awards granted, Number of shares | 42,565us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = stm_TwentyTwoJulyTwoThousandThirteenMember / us-gaap_PlanNameAxis = stm_TwoThousandThirteenChiefExecutiveOfficerSpecialBonusMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
July 22, 2013 [Member] | Employees [Member] | Employee Plan 2013 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jul. 22, 2013
Awards granted, Number of shares | 5,750,730us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = stm_TwentyTwoJulyTwoThousandThirteenMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandThirteenMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
Share based compensation arrangement by share based payment award, Number of shares lost on performance | (1,832,360)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesLostOnPerformance / us-gaap_AwardTypeAxis = stm_TwentyTwoJulyTwoThousandThirteenMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandThirteenMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
December 18, 2013 [Member] | Employees [Member] | Employee Plan 2013 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Dec. 18, 2013
Awards granted, Number of shares | 659,515us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = stm_EighteenDecemberTwoThousandThirteenMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandThirteenMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
Share based compensation arrangement by share based payment award, Number of shares lost on performance | (157,858)stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesLostOnPerformance / us-gaap_AwardTypeAxis = stm_EighteenDecemberTwoThousandThirteenMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandThirteenMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
December 27, 2013 [Member] | Employees [Member] | Employee Plan 2013 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Dec. 27, 2013
Awards granted, Number of shares | 1,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = stm_TwentySevenDecemberTwoThousandThirteenMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandThirteenMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
July 22, 2014 [Member] | Employees [Member] | Employee Plan 2014 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Jul. 22, 2014
Awards granted, Number of shares | 6,458,435us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = stm_TwentyTwoJulyTwoThousandFourteenMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandFourteenMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember
December 18, 2014 [Member] | Employees [Member] | Employee Plan 2014 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Grant date of Nonvested share | Dec. 18, 2014
Awards granted, Number of shares | 500,775us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = stm_EighteenDecemberTwoThousandFourteenMember / us-gaap_PlanNameAxis = stm_EmployeePlanTwoThousandFourteenMember / us-gaap_TitleOfIndividualAxis = stm_EmployeesMember

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted And Vested In Period + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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