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Segment Information - Net Revenues by Product Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 7,404us-gaap_SalesRevenueNet	$ 8,082us-gaap_SalesRevenueNet	$ 8,493us-gaap_SalesRevenueNet
Sense & Power and Automotive Products (SP&A) [Member]
Revenues from External Customers and Long-Lived Assets [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
Embedded Processing Solutions (EPS) [Member]
Revenues from External Customers and Long-Lived Assets [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
Product Segments [Member]
Revenues from External Customers and Long-Lived Assets [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]
Revenues from External Customers and Long-Lived Assets [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

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- 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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