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Segment Information - Property, Plant & Equipment (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | $ 2,647us-gaap_PropertyPlantAndEquipmentNet | $ 3,156us-gaap_PropertyPlantAndEquipmentNet
The Netherlands [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 384us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_NL | 333us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_NL
France [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 777us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_FR | 1,063us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_FR
Italy [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 555us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_IT | 690us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_IT
Other European Countries [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 117us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = stm_OtherEuropeanCountryMember | 131us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = stm_OtherEuropeanCountryMember
USA [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 7us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 17us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
Singapore [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 302us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_SG | 341us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_SG
Malaysia [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 180us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MY | 195us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MY
Other Countries [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | $ 325us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = stm_OtherForeignCountryMember | $ 386us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = stm_OtherForeignCountryMember

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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