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Segment Information - Reconciliation of Operating Income (Loss) of Segments to Total Operating Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Impairment, restructuring charges and other related closure costs | $ (90)us-gaap_RestructuringSettlementAndImpairmentProvisions | $ (292)us-gaap_RestructuringSettlementAndImpairmentProvisions | $ (1,376)us-gaap_RestructuringSettlementAndImpairmentProvisions
Operating income (loss) | 168us-gaap_OperatingIncomeLoss | (465)us-gaap_OperatingIncomeLoss | (2,081)us-gaap_OperatingIncomeLoss
Product Segments [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Operating income (loss) | 344us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_ProductSegmentsMember | (129)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_ProductSegmentsMember | (474)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_ProductSegmentsMember
Others [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Strategic and other research and development programs | (7)us-gaap_OtherResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (15)us-gaap_OtherResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (12)us-gaap_OtherResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Phase-out and start-up costs | (16)stm_PhaseOutAndStartUpCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (5)stm_PhaseOutAndStartUpCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Impairment, restructuring charges and other related closure costs | (90)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (292)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (1,376)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Unused capacity charges | (53)us-gaap_DebtInstrumentUnusedBorrowingCapacityFee / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (32)us-gaap_DebtInstrumentUnusedBorrowingCapacityFee / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (172)us-gaap_DebtInstrumentUnusedBorrowingCapacityFee / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
NXP arbitration award |  |  | (54)us-gaap_LegalFees / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other non-allocated provisions | (10)stm_OtherNonAllocatedProvisions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 8stm_OtherNonAllocatedProvisions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 7stm_OtherNonAllocatedProvisions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Operating income (loss) | $ (176)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ (336)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ (1,607)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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- Definition Other Non Allocated Provisions + References No definition available. + Details
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- Definition Phase Out And Start Up Costs + References No definition available. + Details
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- Definition Amount of commitment fees for the unused borrowing capacity under the long-term financing arrangement that is available to the entity. + 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(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 22 -Subparagraph b -Article 5 + Details
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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + 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 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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- Definition Amount of other research and development expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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- Definition The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items). + 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 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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