XML 87 R140.htm IDEA: XBRL DOCUMENT v2.4.1.9
Segment Information - Property, Plant & Equipment (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
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