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Segment Information - Operating Income (Loss) by Product Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	$ 168us-gaap_OperatingIncomeLoss	$ (465)us-gaap_OperatingIncomeLoss	$ (2,081)us-gaap_OperatingIncomeLoss
Sense & Power and Automotive Products (SP&A) [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	447us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember	270us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember	409us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_SenseAndPowerAndAutomotiveMember
Embedded Processing Solutions (EPS) [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	(103)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember	(399)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember	(883)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_EmbeddedProcessingSolutionsMember
Product Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	344us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_ProductSegmentsMember	(129)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_ProductSegmentsMember	(474)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = stm_ProductSegmentsMember
Others [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	$ (176)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ (336)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ (1,607)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

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