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Long-Term Investments - Additional Information (Detail) | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  |  | 0 Months Ended |  | 12 Months Ended |
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Sep. 09, 2013 USD ($) | Jul. 22, 2014 Enel Green Power [Member] EUR (€) | Dec. 31, 2014 ST-Ericsson SA [Member] USD ($) | Dec. 31, 2013 ST-Ericsson SA [Member] USD ($) | Feb. 03, 2009 ST-Ericsson SA [Member] | Sep. 09, 2013 JVS [Member] USD ($) | Dec. 31, 2014 JVS [Member] USD ($) | Dec. 31, 2014 Incard do Brazil Ltda [Member] USD ($) | Dec. 31, 2014 3Sun S.r.l. [Member] USD ($) | Dec. 31, 2013 3Sun S.r.l. [Member] USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling share held by Ericsson |  |  |  |  |  |  |  | 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = stm_StEricssonSaMember |  |  |  |  |
Sale of Stock |  |  |  |  |  |  |  |  | 1us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = stm_JvsMember |  |  |  |
Fair value of retained noncontrolling interest | $ 4,000,000us-gaap_NoncontrollingInterestInVariableInterestEntity |  |  | $ 55,000,000us-gaap_NoncontrollingInterestInVariableInterestEntity |  |  |  |  |  |  |  |  |
Value of investment | 56,000,000us-gaap_EquityMethodInvestments | 63,000,000us-gaap_EquityMethodInvestments |  |  |  | 43,000,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = stm_StEricssonSaMember | 50,000,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = stm_StEricssonSaMember |  |  | 43,000,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = stm_JvsMember | 3,000,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = stm_IncardDoBrazilLtdaMember |  | 13,000,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = stm_ThreeSunSrlMember
Deconsolidated gain or loss |  |  |  |  |  |  |  |  | 0us-gaap_DeconsolidationGainOrLossAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = stm_JvsMember |  | 0us-gaap_DeconsolidationGainOrLossAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = stm_IncardDoBrazilLtdaMember |  |
Funding commitment letters capped amount | 149,000,000stm_CommitmentLettersCappedAmount |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) on equity-method investments | (43,000,000)us-gaap_IncomeLossFromEquityMethodInvestments | (122,000,000)us-gaap_IncomeLossFromEquityMethodInvestments | (24,000,000)us-gaap_IncomeLossFromEquityMethodInvestments |  |  | 9,000,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = stm_StEricssonSaMember |  |  |  |  |  | 51,000,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = stm_ThreeSunSrlMember |
Liquidation date | Apr. 15, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Payment for full release from obligation concerning joint venture |  |  |  |  | 15,000,000stm_MaximumPaymentsToAcquireInterestInJointVenture / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = stm_EnelGreenPowerMember |  |  |  |  |  |  |  |
Forgiveness of shareholder's loan |  |  |  |  | € 13,000,000stm_ShareholderLoanForgivenessToEquityInvestee / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = stm_EnelGreenPowerMember |  |  |  |  |  |  |  |

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