XML 122 R106.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Other Income and Expenses, Net - Other Income and Expenses, Net (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Component of Operating Other Cost and Expense [Abstract] |  |  |
Other income and expenses, net | $ 164 | $ 207 | $ 95
Research and Development Funding [Member] |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |
Other income and expenses, net | 144 | 231 | 57
Phase-Out and Start-Up Costs [Member] |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |
Other income and expenses, net | (5) | (16) | (4)
Exchange Gain, Net [Member] |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |
Other income and expenses, net | 2 | 4 | 8
Patent Costs, Net of Reversal of Unused Provisions [Member] |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |
Other income and expenses, net | 3 | (28) | (40)
Gain on Sale of Businesses and Non-Current Assets [Member] |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |
Other income and expenses, net | 18 | 24 | 83
Other, Net [Member] |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |
Other income and expenses, net | $ 2 | $ (8) | $ (9)

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_ComponentOfOperatingOtherCostAndExpenseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations. + References No definition available. + Details
Name: | us-gaap_OtherOperatingIncomeExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=us-gaap_ResearchAndDevelopmentArrangementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=stm_StartUpAndPhaseOutCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=stm_ExchangeGainNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=stm_PatentCostsNetOfReversalOfUnusedProvisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=stm_GainOnSaleOfBusinessesAndNonCurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=stm_OtherMiscellaneousIncomeExpenseNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |