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Other Non-Current Assets - Additional Information (Detail) (Minimum [Member])	12 Months Ended
	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