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Interest Expense, Net - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Investment Income [Line Items] |  |  |
Capitalized borrowing cost | $ 0us-gaap_InterestExpenseShortTermBorrowings | $ 0us-gaap_InterestExpenseShortTermBorrowings | $ 0us-gaap_InterestExpenseShortTermBorrowings
Senior Unsecured Convertible Debt [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Interest expense | 12,000,000us-gaap_InterestExpenseDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stm_SeniorUnsecuredConvertibleDebtMember |  |
Non-cash interest expense accretion of discount on liability component | 10,000,000us-gaap_AccretionExpense / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = stm_SeniorUnsecuredConvertibleDebtMember |  |
Issued date of senior unsecured convertible bonds | Jul. 31, 2014 |  |
Floating Rate Notes [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Interest income (expense), net | $ 2,400,000us-gaap_InvestmentIncomeNet / us-gaap_InvestmentTypeAxis = stm_FloatingRateNotesMember | $ 1,000,000us-gaap_InvestmentIncomeNet / us-gaap_InvestmentTypeAxis = stm_FloatingRateNotesMember | $ 2,000,000us-gaap_InvestmentIncomeNet / us-gaap_InvestmentTypeAxis = stm_FloatingRateNotesMember

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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition Date the debt instrument was issued, in CCYY-MM-DD format. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.7) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 9 + Details
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