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Contingencies, Claims and Legal Proceedings - Additional Information (Detail) (EUR €) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Loss Contingencies [Line Items] |
Project authorized | € 446
Project authorized to allocate | 542
Additional investment on project | 1,700
Funding for capital investment | 78
Funding for capital investment approximately received | € 44

X
- Definition Funding Of Investment + References No definition available. + Details
Name: | stm_FundingOfInvestment
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Funds Received + References No definition available. + Details
Name: | stm_FundsReceived
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Project Cost + References No definition available. + Details
Name: | stm_ProjectCost
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Project Costs Additional Costs + References No definition available. + Details
Name: | stm_ProjectCostsAdditionalCosts
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Project Costs Allocated By Jurisdiction + References No definition available. + Details
Name: | stm_ProjectCostsAllocatedByJurisdiction
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration