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Related Party Transactions - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Research and development expenses		$ 121,000,000stm_RelatedPartyTransactionResearchAndDevelopmentExpensesFromTransactionsWithRelatedParty	$ 282,000,000stm_RelatedPartyTransactionResearchAndDevelopmentExpensesFromTransactionsWithRelatedParty
Accounts payable	56,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent	82,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent	62,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
Contributed cash amounts to ST Foundation	500,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	500,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
JVD [Member]
Related Party Transaction [Line Items]
Research and development expenses		121,000,000stm_RelatedPartyTransactionResearchAndDevelopmentExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = stm_JvdMember
ST-Ericsson AT (JVD) [Member]
Related Party Transaction [Line Items]
Research and development expenses			224,000,000stm_RelatedPartyTransactionResearchAndDevelopmentExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = stm_StEricssonAtJvdMember
Accounts payable			$ 44,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = stm_StEricssonAtJvdMember

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- Definition

Research and development expenses from transactions with related party realized during the period.

+ References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of obligations due all related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(k)(1))

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

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-Name Accounting Standards Codification

-Topic 850

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-Section 50

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