XML 140 R124.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Financial Instruments and Risk Management - Notional Amounts of Outstanding Derivative Instruments (Detail) - Designated as Hedging Instrument [Member] | Dec. 31, 2016 USD ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 SGD | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
--- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |
Notional amount | $ | $ 1,370,000,000 |  |  | $ 1,449,000,000 | $ 1,386,000,000
Foreign Exchange Forward Contracts [Member] | R&D and Other Operating Expense [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  | € 237,000,000 |  |  |
Foreign Exchange Forward Contracts [Member] | Manufacturing Costs [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  | 347,000,000 | SGD 123,000,000 |  |
Currency Collars [Member] | R&D and Other Operating Expense [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  | 248,000,000 |  |  |
Currency Collars [Member] | Manufacturing Costs [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  | € 387,000,000 |  |  |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=stm_RdAndOtherOperatingExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=stm_ManufacturingCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=stm_CurrencyCollarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |