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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] $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Beginning balance | $ 0
Assets held for sale | 1
Ending balance | 1
Amount of total losses for the period included in earnings attributable to assets still held at the reporting date | $ 0

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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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Balance Type: | debit
Period Type: | instant

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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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Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
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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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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