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Other Current Assets - Other Current Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Receivables from government agencies	$ 220us-gaap_GrantsReceivableCurrent	$ 127us-gaap_GrantsReceivableCurrent
Taxes and other government receivables	45stm_TaxesAndOtherGovernmentReceivables	56stm_TaxesAndOtherGovernmentReceivables
Advances	36stm_AdvancesReceivable	46stm_AdvancesReceivable
Prepayments	42us-gaap_PrepaidExpenseCurrent	54us-gaap_PrepaidExpenseCurrent
Loans and deposits	9stm_LoansAndDeposits	13stm_LoansAndDeposits
Interest receivable	1us-gaap_InterestReceivableCurrent	1us-gaap_InterestReceivableCurrent
Derivative instruments	1us-gaap_DerivativeInstrumentsAndHedges	43us-gaap_DerivativeInstrumentsAndHedges
Receivables from equity-method investments		8us-gaap_DueFromAffiliateCurrent
Other current assets	36us-gaap_OtherAssetsCurrent	41us-gaap_OtherAssetsCurrent
Total	$ 390stm_OtherReceivablesAndAssets	$ 389stm_OtherReceivablesAndAssets

X

- Definition

Advances receivable.

+ References

No definition available.

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- Definition

Loans and deposits.

+ References

No definition available.

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- Definition

Other receivables and assets.

+ References

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- Definition

Taxes and other government receivables.

+ References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(k)(1))

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-Subparagraph (d)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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- Definition

Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8)

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- Definition

Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Assets

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