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Segment Information - Net Revenues by Product Segment and by Product Line (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net revenues	$ 7,404us-gaap_SalesRevenueNet	$ 8,082us-gaap_SalesRevenueNet	$ 8,493us-gaap_SalesRevenueNet
Sense & Power and Automotive Products (SP&A) [Member]
Segment Reporting Information [Line Items]
Net revenues	4,774us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember	4,775us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember	4,622us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember
Sense & Power and Automotive Products (SP&A) [Member] | Automotive ("APG") [Member]
Segment Reporting Information [Line Items]
Net revenues	1,807us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember / us-gaap_SubsegmentsAxis = stm_AutomotiveProductsGroupMember	1,668us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember / us-gaap_SubsegmentsAxis = stm_AutomotiveProductsGroupMember	1,554us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember / us-gaap_SubsegmentsAxis = stm_AutomotiveProductsGroupMember
Sense & Power and Automotive Products (SP&A) [Member] | Industrial & Power Discrete ("IPD") [Member]
Segment Reporting Information [Line Items]
Net revenues	1,865us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember / us-gaap_SubsegmentsAxis = stm_IndustrialAndPowerDiscreteMember	1,801us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember / us-gaap_SubsegmentsAxis = stm_IndustrialAndPowerDiscreteMember	1,747us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember / us-gaap_SubsegmentsAxis = stm_IndustrialAndPowerDiscreteMember
Sense & Power and Automotive Products (SP&A) [Member] | Analog & MEMS ("AMS") [Member]
Segment Reporting Information [Line Items]
Net revenues	1,102us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember / us-gaap_SubsegmentsAxis = stm_AnalogPowerAndMicroElectroMechanicalSystemsMember	1,306us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember / us-gaap_SubsegmentsAxis = stm_AnalogPowerAndMicroElectroMechanicalSystemsMember	1,320us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember / us-gaap_SubsegmentsAxis = stm_AnalogPowerAndMicroElectroMechanicalSystemsMember
Sense & Power and Automotive Products (SP&A) [Member] | Other SPA [Member]
Segment Reporting Information [Line Items]
Net revenues			1us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember / us-gaap_SubsegmentsAxis = stm_OtherSenseAndPowerAndAutomotiveMember
Embedded Processing Solutions (EPS) [Member]
Segment Reporting Information [Line Items]
Net revenues	2,608us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember	3,269us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember	3,826us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember
Embedded Processing Solutions (EPS) [Member] | Digital Convergence Group ("DCG") [Member]
Segment Reporting Information [Line Items]
Net revenues	756us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_DigitalConvergenceGroupMember	1,492us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_DigitalConvergenceGroupMember	2,275us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_DigitalConvergenceGroupMember
Embedded Processing Solutions (EPS) [Member] | Microcontrollers, Memory & Security ("MMS") [Member]
Segment Reporting Information [Line Items]
Net revenues	330us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_MicrocontrollersNonFlashNonVolatileMemoryAndSmartCardProductsMember	409us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_MicrocontrollersNonFlashNonVolatileMemoryAndSmartCardProductsMember	395us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_MicrocontrollersNonFlashNonVolatileMemoryAndSmartCardProductsMember
Embedded Processing Solutions (EPS) [Member] | Wireless ("WPS") [Member]
Segment Reporting Information [Line Items]
Net revenues	1,507us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_WirelessMember	1,367us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_WirelessMember	1,147us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_WirelessMember
Embedded Processing Solutions (EPS) [Member] | Other EPS [Member]
Segment Reporting Information [Line Items]
Net revenues	15us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_OtherEmbeddedProcessingSolutionsMember	1us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_OtherEmbeddedProcessingSolutionsMember	9us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_OtherEmbeddedProcessingSolutionsMember
Product Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	7,382us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_ProductSegmentsMember	8,044us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_ProductSegmentsMember	8,448us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = stm_ProductSegmentsMember
Others [Member]
Segment Reporting Information [Line Items]
Net revenues	$ 22us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ 38us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ 45us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ 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 210.5-03.1)

-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 1

-Article 5

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