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Long-Term Debt - Additional Information (Detail) In Millions, except Per Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Jul. 03, 2014 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Jul. 03, 2014 USD ($) | Dec. 31, 2014 Medium Term Credit Facilities [Member] USD ($) | Dec. 31, 2014 R & D project in France [Member] USD ($) | Dec. 31, 2014 R & D project in France [Member] EUR (€) | Dec. 31, 2014 R & D projects in Italy [Member] USD ($) | Dec. 31, 2014 R & D projects in Italy [Member] EUR (€) | Dec. 31, 2014 Multi Currency Loan to Support our Industrial and R&D Programs [Member] USD ($) | Mar. 31, 2013 Multi Currency Loan to Support our Industrial and R&D Programs [Member] EUR (€) | Mar. 12, 2013 Multi Currency Loan to Support our Industrial and R&D Programs [Member] USD ($) | Dec. 31, 2014 European Investment Bank [Member] CreditFacility | Dec. 31, 2014 Fair Value, Inputs, Level 3 [Member] USD ($) | Dec. 31, 2014 Europe [Member] Multi Currency Loan to Support our Industrial and R&D Programs [Member] USD ($) | Dec. 31, 2014 Europe [Member] Multi Currency Loan to Support our Industrial and R&D Programs [Member] EUR (€) | Dec. 31, 2014 Zero Coupon due 2019 (Tranche A) [Member] | Jul. 03, 2014 Zero Coupon due 2019 (Tranche A) [Member] | Dec. 31, 2014 Zero Coupon due 2019 (Tranche A) [Member] Senior Unsecured Convertible Bonds [Member] | Jul. 03, 2014 Zero Coupon due 2019 (Tranche A) [Member] Senior Unsecured Convertible Bonds [Member] USD ($) | Dec. 31, 2014 1.0% due 2021 (Tranche B) [Member] | Jul. 03, 2014 1.0% due 2021 (Tranche B) [Member] | Dec. 31, 2014 1.0% due 2021 (Tranche B) [Member] Senior Unsecured Convertible Bonds [Member] | Jul. 03, 2014 1.0% due 2021 (Tranche B) [Member] Senior Unsecured Convertible Bonds [Member] USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  |  |  | $ 1,000us-gaap_DebtInstrumentFaceAmount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = stm_ZeroCouponDueTwoThousandNineteenTrancheAMember / us-gaap_LongtermDebtTypeAxis = stm_SeniorUnsecuredConvertibleBondsMember |  |  |  | $ 400us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = stm_OnePointZeroPercentageDueTwoThousandTwentyOneTrancheBMember / us-gaap_LongtermDebtTypeAxis = stm_SeniorUnsecuredConvertibleBondsMember
Debt instrument periodic payment |  | Semi-annually |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2019 |  |  |  | 2021 |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = stm_ZeroCouponDueTwoThousandNineteenTrancheAMember |  | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = stm_ZeroCouponDueTwoThousandNineteenTrancheAMember / us-gaap_LongtermDebtTypeAxis = stm_SeniorUnsecuredConvertibleBondsMember | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = stm_ZeroCouponDueTwoThousandNineteenTrancheAMember / us-gaap_LongtermDebtTypeAxis = stm_SeniorUnsecuredConvertibleBondsMember | 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = stm_OnePointZeroPercentageDueTwoThousandTwentyOneTrancheBMember |  | 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = stm_OnePointZeroPercentageDueTwoThousandTwentyOneTrancheBMember / us-gaap_LongtermDebtTypeAxis = stm_SeniorUnsecuredConvertibleBondsMember | 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = stm_OnePointZeroPercentageDueTwoThousandTwentyOneTrancheBMember / us-gaap_LongtermDebtTypeAxis = stm_SeniorUnsecuredConvertibleBondsMember
Senior unsecured convertible bonds conversion price |  |  |  |  | $ 12us-gaap_DebtInstrumentConvertibleConversionPrice1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured convertible bonds conversion premium rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00%stm_DebtInstrumentConvertibleConversionPremiumPercentage / us-gaap_DebtInstrumentAxis = stm_ZeroCouponDueTwoThousandNineteenTrancheAMember |  |  |  | 31.00%stm_DebtInstrumentConvertibleConversionPremiumPercentage / us-gaap_DebtInstrumentAxis = stm_OnePointZeroPercentageDueTwoThousandTwentyOneTrancheBMember |  |
Net proceeds from issuance of senior unsecured convertible bonds | 994us-gaap_ProceedsFromIssuanceOfLongTermDebt | 3us-gaap_ProceedsFromIssuanceOfLongTermDebt | 477us-gaap_ProceedsFromIssuanceOfLongTermDebt | 464us-gaap_ProceedsFromIssuanceOfLongTermDebt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of liability component |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 878us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  |  |  |  |  |  |  |  |
Debt discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.40%us-gaap_FairValueInputsDiscountRate / us-gaap_DebtInstrumentAxis = stm_ZeroCouponDueTwoThousandNineteenTrancheAMember |  |  |  | 3.22%us-gaap_FairValueInputsDiscountRate / us-gaap_DebtInstrumentAxis = stm_OnePointZeroPercentageDueTwoThousandTwentyOneTrancheBMember |  |  |
Debt transaction costs |  | 6us-gaap_DebtIssuanceCosts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion features of the instruments value |  | 121us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated debt issuance costs |  | 1us-gaap_DebtConversionConvertedInstrumentAmount1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt unamortized discount |  | 112us-gaap_DebtInstrumentUnamortizedDiscount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unutilized committed medium term credit facilities |  |  |  |  |  | 583us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = stm_MediumTermCreditFacilitiesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit outstanding amount |  |  |  |  |  |  |  | 245us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = stm_RAndDProjectInFranceMember |  | 250us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = stm_RAndDProjectsInItalyMember |  | 350us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = stm_UncommittedShortTermCreditFacilitiesMember |  |  |  |  | 350us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = stm_UncommittedShortTermCreditFacilitiesMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |  |  |  |  |  |  |  |
Number of long-term amortizing credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 4stm_NumberOfLongTermRevolvingCreditFacilities / us-gaap_LineOfCreditFacilityAxis = stm_EuropeanInvestmentBankMember |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  | 48stm_CreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = stm_RAndDProjectInFranceMember |  | 109stm_CreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = stm_RAndDProjectsInItalyMember |  | 412stm_CreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = stm_UncommittedShortTermCreditFacilitiesMember |  |  |  |  | 331stm_CreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = stm_UncommittedShortTermCreditFacilitiesMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |  |  |  |  |  |  |  |  |
Line of credit amount withdrawn |  |  |  |  |  |  | $ 341stm_LineOfCreditFacilityAmountDrawn / us-gaap_LineOfCreditFacilityAxis = stm_RAndDProjectInFranceMember |  | $ 380stm_LineOfCreditFacilityAmountDrawn / us-gaap_LineOfCreditFacilityAxis = stm_RAndDProjectsInItalyMember |  |  |  | $ 471stm_LineOfCreditFacilityAmountDrawn / us-gaap_LineOfCreditFacilityAxis = stm_UncommittedShortTermCreditFacilitiesMember |  |  | $ 321stm_LineOfCreditFacilityAmountDrawn / us-gaap_LineOfCreditFacilityAxis = stm_UncommittedShortTermCreditFacilitiesMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | € 100stm_LineOfCreditFacilityAmountDrawn / us-gaap_LineOfCreditFacilityAxis = stm_UncommittedShortTermCreditFacilitiesMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |  |  |  |  |  |  |  |

X
- Definition Credit Facility Amount Outstanding + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Debt instrument convertible conversion premium percentage. + References No definition available. + Details
Name: | stm_DebtInstrumentConvertibleConversionPremiumPercentage
Namespace Prefix: | stm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument Maturity Year + References No definition available. + Details
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Namespace Prefix: | stm_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Line Of Credit Facility Amount Drawn + References No definition available. + Details
Name: | stm_LineOfCreditFacilityAmountDrawn
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number Of Long Term Revolving Credit Facilities + References No definition available. + Details
Name: | stm_NumberOfLongTermRevolvingCreditFacilities
Namespace Prefix: | stm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=26072319&loc=SL6014347-161799 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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Namespace Prefix: | us-gaap_
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Description of the frequency of periodic payments (monthly, quarterly, annual). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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Balance Type: | debit
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X
- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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Balance Type: | debit
Period Type: | duration