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Impairment, Restructuring Charges and Other Related Closure Costs - Summary of Impairment, Restructuring Charges and Other Related Closure Costs (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment | $ (24)us-gaap_AssetImpairmentCharges | $ (109)us-gaap_AssetImpairmentCharges | $ (1,268)us-gaap_AssetImpairmentCharges
Restructuring charges | (41)us-gaap_SeveranceCosts1 | (178)us-gaap_SeveranceCosts1 | (84)us-gaap_SeveranceCosts1
Other related closure costs | (25)us-gaap_OtherRestructuringCosts | (5)us-gaap_OtherRestructuringCosts | (24)us-gaap_OtherRestructuringCosts
Total impairment, restructuring charges and other related closure costs | (90)us-gaap_RestructuringSettlementAndImpairmentProvisions | (292)us-gaap_RestructuringSettlementAndImpairmentProvisions | (1,376)us-gaap_RestructuringSettlementAndImpairmentProvisions
$600-650 Million Net Opex Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | (17)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_SixHundredToSixHundredAndFiftyMillionNetOpexPlanMember | (88)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_SixHundredToSixHundredAndFiftyMillionNetOpexPlanMember |
Other related closure costs | (7)us-gaap_OtherRestructuringCosts / us-gaap_RestructuringPlanAxis = stm_SixHundredToSixHundredAndFiftyMillionNetOpexPlanMember |  |
Total impairment, restructuring charges and other related closure costs | (24)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_SixHundredToSixHundredAndFiftyMillionNetOpexPlanMember | (88)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_SixHundredToSixHundredAndFiftyMillionNetOpexPlanMember |
Manufacturing Consolidation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment |  | (29)us-gaap_AssetImpairmentCharges / us-gaap_RestructuringPlanAxis = stm_ManufacturingConsolidationMember |
Restructuring charges | (8)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_ManufacturingConsolidationMember | (8)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_ManufacturingConsolidationMember |
Other related closure costs | (4)us-gaap_OtherRestructuringCosts / us-gaap_RestructuringPlanAxis = stm_ManufacturingConsolidationMember |  |
Total impairment, restructuring charges and other related closure costs | (12)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_ManufacturingConsolidationMember | (37)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_ManufacturingConsolidationMember |
EPS Restructuring Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | (16)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_EpsRestructuringPlanMember |  |
Other related closure costs | (14)us-gaap_OtherRestructuringCosts / us-gaap_RestructuringPlanAxis = stm_EpsRestructuringPlanMember |  |
Total impairment, restructuring charges and other related closure costs | (30)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_EpsRestructuringPlanMember |  |
Long-lived Impairment Charge [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment | (24)us-gaap_AssetImpairmentCharges / us-gaap_RestructuringPlanAxis = stm_LongLivedAssetChargesMember |  |
Total impairment, restructuring charges and other related closure costs | (24)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_LongLivedAssetChargesMember |  |
ST-Ericsson Restructuring Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  | (6)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_StEricssonRestructuringPlanMember | (1)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_StEricssonRestructuringPlanMember
Other related closure costs |  | (3)us-gaap_OtherRestructuringCosts / us-gaap_RestructuringPlanAxis = stm_StEricssonRestructuringPlanMember |
Total impairment, restructuring charges and other related closure costs |  | (9)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_StEricssonRestructuringPlanMember | (1)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_StEricssonRestructuringPlanMember
ST-Ericsson Exit [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment |  | (17)us-gaap_AssetImpairmentCharges / us-gaap_RestructuringPlanAxis = stm_StEricssonExitMember | (544)us-gaap_AssetImpairmentCharges / us-gaap_RestructuringPlanAxis = stm_StEricssonExitMember
Restructuring charges |  | (69)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_StEricssonExitMember |
Total impairment, restructuring charges and other related closure costs |  | (86)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_StEricssonExitMember | (544)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_StEricssonExitMember
Digital Restructuring Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment |  | (2)us-gaap_AssetImpairmentCharges / us-gaap_RestructuringPlanAxis = stm_DigitalRestructuringPlanMember | (7)us-gaap_AssetImpairmentCharges / us-gaap_RestructuringPlanAxis = stm_DigitalRestructuringPlanMember
Restructuring charges |  | (1)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_DigitalRestructuringPlanMember | (13)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_DigitalRestructuringPlanMember
Other related closure costs |  | (2)us-gaap_OtherRestructuringCosts / us-gaap_RestructuringPlanAxis = stm_DigitalRestructuringPlanMember |
Total impairment, restructuring charges and other related closure costs |  | (5)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_DigitalRestructuringPlanMember | (20)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_DigitalRestructuringPlanMember
Goodwill and Other Intangible Impairment Charge [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment |  | (56)us-gaap_AssetImpairmentCharges / us-gaap_RestructuringPlanAxis = stm_GoodwillAndOtherIntangibleImpairmentChargeMember | (694)us-gaap_AssetImpairmentCharges / us-gaap_RestructuringPlanAxis = stm_GoodwillAndOtherIntangibleImpairmentChargeMember
Total impairment, restructuring charges and other related closure costs |  | (56)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_GoodwillAndOtherIntangibleImpairmentChargeMember | (694)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_GoodwillAndOtherIntangibleImpairmentChargeMember
Assets Held for Sale Impairment [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment |  | (5)us-gaap_AssetImpairmentCharges / us-gaap_RestructuringPlanAxis = stm_AssetsHeldforsaleImpairmentMember |
Total impairment, restructuring charges and other related closure costs |  | (5)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_AssetsHeldforsaleImpairmentMember |
Other Restructuring Initiatives [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  | (6)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_OtherRestructuringInitiativesMember |
Other related closure costs |  |  | (8)us-gaap_OtherRestructuringCosts / us-gaap_RestructuringPlanAxis = stm_OtherRestructuringInitiativesMember
Total impairment, restructuring charges and other related closure costs |  | (6)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_OtherRestructuringInitiativesMember | (8)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_OtherRestructuringInitiativesMember
Manufacturing Restructuring Plans [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment |  |  | (21)us-gaap_AssetImpairmentCharges / us-gaap_RestructuringPlanAxis = stm_ManufacturingRestructuringPlanMember
Other related closure costs |  |  | (2)us-gaap_OtherRestructuringCosts / us-gaap_RestructuringPlanAxis = stm_ManufacturingRestructuringPlanMember
Total impairment, restructuring charges and other related closure costs |  |  | (23)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_ManufacturingRestructuringPlanMember
ST-Ericsson Cost Savings Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | (10)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_StEricssonCostSavingsPlanMember
Other related closure costs |  |  | (10)us-gaap_OtherRestructuringCosts / us-gaap_RestructuringPlanAxis = stm_StEricssonCostSavingsPlanMember
Total impairment, restructuring charges and other related closure costs |  |  | (20)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_StEricssonCostSavingsPlanMember
ST-Ericsson April 2012 Restructuring Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment |  |  | (2)us-gaap_AssetImpairmentCharges / us-gaap_RestructuringPlanAxis = stm_StEricssonApril2012RestructuringPlanMember
Restructuring charges |  |  | (60)us-gaap_SeveranceCosts1 / us-gaap_RestructuringPlanAxis = stm_StEricssonApril2012RestructuringPlanMember
Other related closure costs |  |  | (4)us-gaap_OtherRestructuringCosts / us-gaap_RestructuringPlanAxis = stm_StEricssonApril2012RestructuringPlanMember
Total impairment, restructuring charges and other related closure costs |  |  | $ (66)us-gaap_RestructuringSettlementAndImpairmentProvisions / us-gaap_RestructuringPlanAxis = stm_StEricssonApril2012RestructuringPlanMember

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + 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 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation. + 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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + 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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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