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Segment Information - Operating Income (Loss) by Product Segment (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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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 No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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