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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
	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

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- Definition

Debt instrument convertible conversion premium percentage.

+ References

No definition available.

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- Definition

Debt Instrument Maturity Year

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- Definition

Line Of Credit Facility Amount Drawn

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- Definition

Number Of Long Term Revolving Credit Facilities

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- 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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 25

-Paragraph 22

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- 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.

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-Topic 230

-SubTopic 10

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-Topic 230

-SubTopic 10

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (b)

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Face (par) amount of debt instrument at time of issuance.

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-Topic 835

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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Subparagraph (SX 210.5-02.22(a)(1))

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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.

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- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

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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.

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-Paragraph 2

-Subparagraph (bbb)

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- 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.

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-Name Accounting Standards Codification

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-Subparagraph (SX 210.9-03.16)

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-Name Accounting Standards Codification

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Subparagraph (SX 210.5-02.19(b),22(b))

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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- 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.

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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.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Paragraph 14

-Subparagraph (b)

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