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Goodwill - Additional Information (Detail) (USD $)	12 Months Ended		3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Goodwill [Line Items]
Accumulated impairment losses, net	$ 1,024,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	$ 1,024,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Impairment loss of goodwill	0us-gaap_GoodwillImpairmentLoss	38,000,000us-gaap_GoodwillImpairmentLoss
Re-classification to AHFS		10,000,000stm_GoodwillReclassifiedToAssetsHeldForSale
Veredus [Member]
Goodwill [Line Items]
Minority interest ownership percentage		67.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = stm_VeredusMember
Re-classification to AHFS		10,000,000stm_GoodwillReclassifiedToAssetsHeldForSale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = stm_VeredusMember
Sale of equity interest, percentage	51.00%stm_PercentageOfEquityInterestSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = stm_VeredusMember
Embedded Processing Solutions (EPS) [Member]
Goodwill [Line Items]
Accumulated impairment losses, net	1,018,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember	1,018,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember
Impairment loss of goodwill		38,000,000us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember
Embedded Processing Solutions (EPS) [Member] | Microcontrollers, Memory & Security ("MMS") [Member]
Goodwill [Line Items]
Impairment loss of goodwill			0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember / us-gaap_SubsegmentsAxis = stm_MicrocontrollersNonFlashNonVolatileMemoryAndSmartCardProductsMember
Others [Member]
Goodwill [Line Items]
Accumulated impairment losses, net	6,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	6,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Digital Convergence Group ("DCG") [Member]
Goodwill [Line Items]
Impairment loss of goodwill		$ 38,000,000us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = stm_DigitalConvergenceGroupMember

X

- Definition

Goodwill Reclassified To Assets Held For Sale

+ References

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- Definition

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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 20

-Section 50

-Paragraph 1

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

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-Section 45

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