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Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $) | 12 Months Ended
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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

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- Definition Goodwill Reclassified To Assets Held For Sale + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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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 -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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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 -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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