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Segment Information - Net Revenues (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
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

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