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Financial Instruments and Risk Management - Schedule of Assets (Liabilities) Measured at Fair Value on Non-Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (Fair Value, Inputs, Level 3 [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Beginning balance |
Assets held for sale | 11
Sale of assets | (5)
Deconsolidation of assets | (6)
Veredus asset group | 16
Ending balance | 16
Amount of total losses for the period included in earnings attributable to assets still held at the reporting date | $ (5)

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Nonecurring Basis Asset Value + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Nonrecurring Basis Asset Assets Held For Sale + References No definition available. + Details
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Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Nonrecurring Basis Asset Deconsolidation of assets + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Nonrecurring Basis Asset Purchases + References No definition available. + Details
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Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Nonrecurring Basis Asset Sales + References No definition available. + Details
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Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fair value measurement with unobservable inputs reconciliation non recurring basis asset still held gain loss included in earnings at reporting date. + References No definition available. + Details
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Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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