XML 25 R104.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Shareholders' Equity - Changes in AOCI Attributable to Stockholders (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
OCI before reclassifications | $ (452)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax | $ 226us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax | $ 41us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax |
Amounts reclassified from AOCI | 8stm_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss | (14)stm_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss | 80stm_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss |
Impact of ST-Ericsson deconsolidation |  | 60stm_OtherComprehensiveIncomeImpactOfDeconsolidations |  |
OCI Balance | (444)us-gaap_OtherComprehensiveIncomeLossBeforeTax | 272us-gaap_OtherComprehensiveIncomeLossBeforeTax | 121us-gaap_OtherComprehensiveIncomeLossBeforeTax |
Cumulative tax impact | 15us-gaap_OtherComprehensiveIncomeLossTax | (24)us-gaap_OtherComprehensiveIncomeLossTax | 3us-gaap_OtherComprehensiveIncomeLossTax |
OCI Balance, net of tax | (429)stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax | 248stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax | 124stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax |
Balance | 580stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes | 1,024stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes | 752stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes | 631stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
Cumulative tax impact | 33stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax | 18stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax | 42stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax | 39stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax
Balance, net of tax | 613us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 1,042us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 794us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 670us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |
OCI before reclassifications | (116)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 40us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 28us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Amounts reclassified from AOCI | 2stm_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (28)stm_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 62stm_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
OCI Balance | (114)us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 12us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 90us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Cumulative tax impact | 5us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (3)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (11)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
OCI Balance, net of tax | (109)stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 9stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 79stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Balance | (76)stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 38stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 26stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (64)stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Cumulative tax impact |  | (5)stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (2)stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 9stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Balance, net of tax | (76)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 33us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 24us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (55)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Available-For-Sale Securities [Member] |  |  |  |
OCI before reclassifications | 1us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 2us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 6us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
OCI Balance | 1us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 2us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 6us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Cumulative tax impact |  | 3us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |
OCI Balance, net of tax | 1stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 5stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 6stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Balance | 2stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 1stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (1)stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (7)stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Cumulative tax impact |  |  | (3)stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (3)stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Balance, net of tax | 2us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 1us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (10)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Accumulated Defined Benefit Plan Items [Member] |  |  |  |
OCI before reclassifications | (65)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 80us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (57)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Amounts reclassified from AOCI | 6stm_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 14stm_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 18stm_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Impact of ST-Ericsson deconsolidation |  | 11stm_OtherComprehensiveIncomeImpactOfDeconsolidations / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |
OCI Balance | (59)us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 105us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (39)us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Cumulative tax impact | 10us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (24)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 14us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
OCI Balance, net of tax | (49)stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 81stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (25)stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Balance | (159)stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (100)stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (205)stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (166)stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Cumulative tax impact | 33stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 23stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 47stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 33stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Balance, net of tax | (126)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (77)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (158)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (133)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Foreign Currency Translation Adjustments ("CTA") [Member] |  |  |  |
OCI before reclassifications | (272)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | 104us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | 64us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember |
Impact of ST-Ericsson deconsolidation |  | 49stm_OtherComprehensiveIncomeImpactOfDeconsolidations / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember |  |
OCI Balance | (272)us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | 153us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | 64us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember |
OCI Balance, net of tax | (272)stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | 153stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | 64stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember |
Balance | 813stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | 1,085stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | 932stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | 868stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember
Balance, net of tax | $ 813us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | $ 1,085us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | $ 932us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember | $ 868us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = stm_ForeignCurrencyTranslationAndOtherMember

X
- Definition Accumulated Other Comprehensive Income Loss Adjustment Net Of Tax + References No definition available. + Details
Name: | stm_AccumulatedOtherComprehensiveIncomeLossAdjustmentNetOfTax
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Accumulated Other Comprehensive Income Loss Attributable to The Company's Stockholders Net Of Tax. + References No definition available. + Details
Name: | stm_AccumulatedOtherComprehensiveIncomeLossAttributableToCompanyStockholdersNetOfTax
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Accumulated Other Comprehensive Income Loss Before Taxes + References No definition available. + Details
Name: | stm_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amounts Reclassified From Accumulated Other Comprehensive Income Loss + References No definition available. + Details
Name: | stm_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other Comprehensive Income Impact Of Deconsolidations + References No definition available. + Details
Name: | stm_OtherComprehensiveIncomeImpactOfDeconsolidations
Namespace Prefix: | stm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
Name: | us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References No definition available. + Details
Name: | us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount before tax, after reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669625-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33775-111570 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=stm_ForeignCurrencyTranslationAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |