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Income Tax - Gross Deferred Tax Assets on Tax Loss Carryforwards and Investment Credits Expiration (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
2015	$ 1stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationYearOne
2016	46stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationYearTwo
2017	12stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationYearThree
2018	89stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationYearFour
2019	77stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationYearFive
Thereafter	683stm_DeferredTaxAssetsOnTaxLossCarryforwardsAndInvestmentCreditsExpirationThereafter
Total	$ 908us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	$ 658us-gaap_DeferredTaxAssetsOperatingLossCarryforwards

X

- Definition

Deferred tax assets on tax loss carryforwards and investment credits expiration Thereafter.

+ References

No definition available.

+ Details

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- Definition

Deferred Tax Assets On Tax Loss Carryforwards And Investment Credits Expiration Year Five

+ References

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- Definition

Deferred tax assets on tax loss carryforwards and investment credits expiration Year Four.

+ References

No definition available.

+ Details

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- Definition

Deferred tax assets on tax loss carryforwards and investment credits expiration.

+ References

No definition available.

+ Details

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- Definition

Deferred tax assets on tax loss carryforwards and investment credits expiration Year Three.

+ References

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- Definition

Deferred tax assets on tax loss carryforwards and investment credits expiration Year Two.

+ References

No definition available.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 25

-Paragraph 20

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314

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