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v3.3.1.900

Other Non-Current Assets - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2015
Minimum [Member] |
Long-term receivables expected collection period | 1 year

X
- Definition Long Term Receivables Collection Period + References No definition available. + Details
Name: | stm_LongTermReceivablesCollectionPeriod
Namespace Prefix: | stm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |