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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
	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.

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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.

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