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Other Non-Current Assets - Other Non-Current Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Available-for-sale equity securities	$ 11us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent	$ 11us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent
Trading equity securities	8us-gaap_OtherMarketableSecuritiesNoncurrent	8us-gaap_OtherMarketableSecuritiesNoncurrent
Long-term State receivables	513stm_LongTermStateReceivables	513stm_LongTermStateReceivables
Long-term receivables from third parties	5us-gaap_OtherReceivables	7us-gaap_OtherReceivables
Long-term loans to affiliates		17us-gaap_DueFromRelatedPartiesNoncurrent
Prepaid for pension	9us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	10us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
Debt issuance costs, net	4us-gaap_UnamortizedDebtIssuanceExpense
Deposits and other non-current assets	30us-gaap_OtherAssetsMiscellaneousNoncurrent	34us-gaap_OtherAssetsMiscellaneousNoncurrent
Total	$ 580us-gaap_OtherAssetsNoncurrent	$ 600us-gaap_OtherAssetsNoncurrent

X

- Definition

Long-term State receivables.

+ References

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- Definition

Equity securities categorized neither as held-to-maturity nor trading which are intended be sold more than one year from the balance sheet date or operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Section 45

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- Definition

The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.17)

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- Definition

Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle).

+ References

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

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-Number 210

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- Definition

Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

+ References

No definition available.

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- Definition

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

+ References

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All other debt and equity financial instruments, which aren't categorized as available-for-sale, or held-to-maturity and which are not otherwise listed in the existing taxonomy, intended to be held longer than one year from the balance sheet date or the normal operating cycle, if longer.

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Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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