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Other Payables and Accrued Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Value of rights granted to Numonyx to use certain assets retained by the company	$ 3stm_ValueOfRightToUseAssetGranted	$ 6stm_ValueOfRightToUseAssetGranted
Rights granted to use certain assets reported as a current liability	$ 2stm_ValueOfRightToUseAssetCurrentLiability	$ 3stm_ValueOfRightToUseAssetCurrentLiability

X

- Definition

value of right to use asset Current Liability.

+ References

No definition available.

+ Details

Name:	stm_ValueOfRightToUseAssetCurrentLiability
Namespace Prefix:	stm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Value of right to use asset Granted.

+ References

No definition available.

+ Details

Name:	stm_ValueOfRightToUseAssetGranted
Namespace Prefix:	stm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration