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Other Payables and Accrued Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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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

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- 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

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