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Contingencies, Claims and Legal Proceedings - Additional Information (Detail) (EUR €) In Millions, unless otherwise specified	12 Months Ended
	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

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- Definition

Funding Of Investment

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No definition available.

+ Details

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Namespace Prefix:	stm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Funds Received

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No definition available.

+ Details

Name:	stm_FundsReceived
Namespace Prefix:	stm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Project Cost

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No definition available.

+ Details

Name:	stm_ProjectCost
Namespace Prefix:	stm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Project Costs Additional Costs

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No definition available.

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Name:	stm_ProjectCostsAdditionalCosts
Namespace Prefix:	stm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Project Costs Allocated By Jurisdiction

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No definition available.

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Name:	stm_ProjectCostsAllocatedByJurisdiction
Namespace Prefix:	stm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:	us-gaap_
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