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Segment Information - Net Revenues (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
The Netherlands [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net revenues | 1,905us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NL | 1,860us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NL | 1,524us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NL
France [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net revenues | 200us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_FR | 289us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_FR | 189us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_FR
Italy [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net revenues | 61us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IT | 78us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IT | 131us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_IT
USA [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net revenues | 1,003us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 1,041us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 1,014us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Singapore [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net revenues | 3,831us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_SG | 3,860us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_SG | 3,784us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_SG
Japan [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net revenues | 368us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 420us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 418us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP
Other Countries [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net revenues | $ 36us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = stm_OtherForeignCountryMember | $ 534us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = stm_OtherForeignCountryMember | $ 1,433us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = stm_OtherForeignCountryMember

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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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