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Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 90,000,000us-gaap_Goodwill	$ 141,000,000us-gaap_Goodwill
Sale of business		(5,000,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Re-classification to AHFS		(10,000,000)stm_GoodwillReclassifiedToAssetsHeldForSale
Foreign currency translation	(8,000,000)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments	2,000,000us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Impairment loss	0us-gaap_GoodwillImpairmentLoss	(38,000,000)us-gaap_GoodwillImpairmentLoss
Goodwill, Ending Balance	82,000,000us-gaap_Goodwill	90,000,000us-gaap_Goodwill
Sense & Power and Automotive Products (SP&A) [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		12,000,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember
Re-classification to AHFS		(10,000,000)stm_GoodwillReclassifiedToAssetsHeldForSale / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember
Goodwill, Ending Balance	2,000,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember	2,000,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember
Embedded Processing Solutions (EPS) [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	88,000,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember	124,000,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember
Foreign currency translation	(8,000,000)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember	2,000,000us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember
Impairment loss		(38,000,000)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember
Goodwill, Ending Balance	80,000,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember	88,000,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember
Others [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		5,000,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Sale of business		$ (5,000,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

X

- Definition

Goodwill Reclassified To Assets Held For Sale

+ References

No definition available.

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- Definition

Amount after accumulated impairment loss of 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

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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X

- 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

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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- Definition

Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of 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

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-SubTopic 20

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-Subparagraph (f)

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- Definition

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

+ References

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-Publisher FASB

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