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Segment Information - Net Revenues by Product Segment (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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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 + Details
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