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Income Tax - Differences in Income Taxes Computed at Netherlands Statutory Rate and Effective Income Tax Rate (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax benefit (expense) computed at statutory rate	$ (26)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 148us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 534us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Non-deductible and non-taxable permanent differences, net	8us-gaap_IncomeTaxReconciliationNondeductibleExpense	(2)us-gaap_IncomeTaxReconciliationNondeductibleExpense	(81)us-gaap_IncomeTaxReconciliationNondeductibleExpense
Income (loss) on equity-method investments	(11)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	(31)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	(6)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary
Valuation allowance adjustments	26us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(83)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(197)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Current year credits	53stm_IncomeTaxReconciliationCurrentTaxCredits	60stm_IncomeTaxReconciliationCurrentTaxCredits	77stm_IncomeTaxReconciliationCurrentTaxCredits
Other tax and credits	8us-gaap_IncomeTaxReconciliationTaxCreditsOther	(42)us-gaap_IncomeTaxReconciliationTaxCreditsOther	(17)us-gaap_IncomeTaxReconciliationTaxCreditsOther
Benefits from tax holidays	65us-gaap_IncomeTaxReconciliationTaxHolidays	18us-gaap_IncomeTaxReconciliationTaxHolidays	38us-gaap_IncomeTaxReconciliationTaxHolidays
Net impact of changes to uncertain tax positions	(92)stm_IncomeTaxReconciliationImpactOfUncertainTaxPositions	(33)stm_IncomeTaxReconciliationImpactOfUncertainTaxPositions	(83)stm_IncomeTaxReconciliationImpactOfUncertainTaxPositions
Earnings of subsidiaries taxed at different rates	(8)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(72)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(316)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Income tax benefit (expense)	$ 23us-gaap_IncomeTaxExpenseBenefit	$ (37)us-gaap_IncomeTaxExpenseBenefit	$ (51)us-gaap_IncomeTaxExpenseBenefit

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Income Tax Reconciliation Current Tax Credits.

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Income Tax Reconciliation Impact Of Uncertain Tax Positions.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income exempt from income tax because of a tax holiday.

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