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v2.4.1.9

Other Non-Current Assets - Additional Information (Detail) (Minimum [Member]) | 12 Months Ended
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Dec. 31, 2014
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