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Commitments - Company's Commitments (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Recorded Unconditional Purchase Obligation [Line Items] |
Operating leases, Total | $ 199us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Operating leases, 2015 | 47us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
Operating leases, 2016 | 34us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
Operating leases, 2017 | 27us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
Operating leases, 2018 | 21us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
Operating leases, 2019 | 13us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Operating leases, Thereafter | 57us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Purchase obligations, Total | 391us-gaap_RecordedUnconditionalPurchaseObligation
Purchase obligations, 2015 | 362us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear
Purchase obligations, 2016 | 15us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
Purchase obligations, 2017 | 6us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear
Purchase obligations, 2018 | 5us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear
Purchase obligations, 2019 | 3us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear
Purchase obligations, Thereafter | 0us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear
Other obligations, Total | 512stm_OtherObligation
Other obligations, 2015 | 284stm_OtherObligationDueCurrent
Other obligations, 2016 | 117stm_OtherObligationDueInTwoYears
Other obligations, 2017 | 81stm_OtherObligationDueInThreeYears
Other obligations, 2018 | 28stm_OtherObligationDueInFourYears
Other obligations, 2019 | 2stm_OtherObligationDueInFiveYears
Other obligations, Thereafter | 0stm_OtherObligationDueThereafter
Company's commitments, Total | 1,102stm_Obligation
Company's commitments, 2015 | 693stm_ObligationDueCurrent
Company's commitments, 2016 | 166stm_ObligationDueInTwoYears
Company's commitments, 2017 | 114stm_ObligationDueInThreeYears
Company's commitments, 2018 | 54stm_ObligationDueInFourYears
Company's commitments, 2019 | 18stm_ObligationDueInFiveYears
Company's commitments, Thereafter | 57stm_ObligationDueThereafter
Equipment Purchase [Member] |
Recorded Unconditional Purchase Obligation [Line Items] |
Purchase obligations, Total | 171us-gaap_RecordedUnconditionalPurchaseObligation / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_EquipmentPurchaseMember
Purchase obligations, 2015 | 171us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_EquipmentPurchaseMember
Purchase obligations, Thereafter | 0us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_EquipmentPurchaseMember
Foundry Purchase [Member] |
Recorded Unconditional Purchase Obligation [Line Items] |
Purchase obligations, Total | 83us-gaap_RecordedUnconditionalPurchaseObligation / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_FoundryPurchaseMember
Purchase obligations, 2015 | 83us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_FoundryPurchaseMember
Purchase obligations, Thereafter | 0us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_FoundryPurchaseMember
Software, Design, Technologies and Licenses [Member] |
Recorded Unconditional Purchase Obligation [Line Items] |
Purchase obligations, Total | 137us-gaap_RecordedUnconditionalPurchaseObligation / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_SoftwareDesignTechnologiesAndLicensesMember
Purchase obligations, 2015 | 108us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_SoftwareDesignTechnologiesAndLicensesMember
Purchase obligations, 2016 | 15us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_SoftwareDesignTechnologiesAndLicensesMember
Purchase obligations, 2017 | 6us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_SoftwareDesignTechnologiesAndLicensesMember
Purchase obligations, 2018 | 5us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_SoftwareDesignTechnologiesAndLicensesMember
Purchase obligations, 2019 | 3us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_SoftwareDesignTechnologiesAndLicensesMember
Purchase obligations, Thereafter | $ 0us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = stm_SoftwareDesignTechnologiesAndLicensesMember

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308 + Details
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- Definition Amount of the recorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308 + Details
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