XML 118 R102.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Shareholders' Equity - Summary of Nonvested Share Activity (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards vested, Number of Shares | (4,810,667) |
Employees [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 11,691,007 |
Awards granted, Number of shares | 7,051,269 |
Awards forfeited/waived, Number of Shares | (129,864) |
Awards cancelled on failed vesting conditions, Number of Shares | (1,990,964) |
Awards vested, Number of Shares | (4,810,667) |
Ending Balance, Number of Shares | 11,810,781 | 11,691,007
Employees [Member] | 2013 CEO Special Bonus [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 28,378 |
Awards vested, Number of Shares | (21,283) |
Ending Balance, Number of Shares | 7,095 | 28,378
Employees [Member] | Employee Plan 2013 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 1,462,359 |
Awards forfeited/waived, Number of Shares | (9,767) |
Awards vested, Number of Shares | (1,452,592) |
Ending Balance, Number of Shares |  | 1,462,359
Employees [Member] | 2014 CEO Special Bonus [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 22,989 |
Awards vested, Number of Shares | (11,494) |
Ending Balance, Number of Shares | 11,495 | 22,989
Employees [Member] | Employee Plan 2014 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 3,246,106 |
Awards forfeited/waived, Number of Shares | (35,574) |
Awards vested, Number of Shares | (1,599,079) |
Ending Balance, Number of Shares | 1,611,453 | 3,246,106
Employees [Member] | 2015 CEO Special Bonus [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted, Number of shares | 53,369 |
Awards vested, Number of Shares | (17,790) |
Ending Balance, Number of Shares | 35,579 |
Employees [Member] | Employee Plan 2015 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 6,931,175 |
Awards forfeited/waived, Number of Shares | (63,228) |
Awards cancelled on failed vesting conditions, Number of Shares | (1,990,964) |
Awards vested, Number of Shares | (1,706,244) |
Ending Balance, Number of Shares | 3,170,739 | 6,931,175
Employees [Member] | Employee Plan 2016 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted, Number of shares | 6,997,900 |
Awards forfeited/waived, Number of Shares | (21,295) |
Awards vested, Number of Shares | (2,185) |
Ending Balance, Number of Shares | 6,974,420 |
Supervisory Board [Member] | 2005 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares |  | 22,115
Year of grant | 2005 |
Exercised |  | (22,115)
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 | 0 |
Supervisory Board [Member] | 2006 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 3,000 | 21,000
Year of grant | 2006 |
Exercised | (3,000) | (18,000)
Ending Balance, Number of Shares |  | 3,000
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 | 0 |
Supervisory Board [Member] | 2007 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 19,500 | 46,500
Year of grant | 2007 |
Exercised | (12,000) | (27,000)
Ending Balance, Number of Shares | 7,500 | 19,500
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 | 0 |
Supervisory Board [Member] | 2008 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 39,000 | 60,000
Year of grant | 2008 |
Exercised | (15,000) | (21,000)
Ending Balance, Number of Shares | 24,000 | 39,000
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 | 0 |
Supervisory Board [Member] | 2009 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 45,000 | 75,000
Year of grant | 2009 |
Exercised | (10,000) | (30,000)
Ending Balance, Number of Shares | 35,000 | 45,000
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 | 0 |
Supervisory Board [Member] | 2010 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 45,000 | 75,000
Year of grant | 2010 |
Exercised |  | (30,000)
Ending Balance, Number of Shares | 45,000 | 45,000
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 | 0 |
Supervisory Board [Member] | 2011 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 82,500 | 97,500
Year of grant | 2011 |
Exercised | (15,000) | (15,000)
Ending Balance, Number of Shares | 67,500 | 82,500
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 | 0 |
Supervisory Board [Member] | 2012 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 95,000 | 102,500
Year of grant | 2012 |
Exercised | (7,500) | (7,500)
Ending Balance, Number of Shares | 87,500 | 95,000
Shares corresponding to exercised option not yet available for trade as of 31.12.2015 | 0 |

X
- Definition Non vested Shares Corresponding To Exercised Option Not Yet Available For Trade + References No definition available. + Details
Name: | stm_NonVestedSharesCorrespondingToExercisedOptionNotYetAvailableForTrade
Namespace Prefix: | stm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share based compensation arrangement by share based payment award equity instruments other than options cancelled on failed vesting conditions in period. + References No definition available. + Details
Name: | stm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledOnFailedVestingConditionsInPeriod
Namespace Prefix: | stm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Year O Grant Date Of Non vested Share + References No definition available. + Details
Name: | stm_YearGrantDateOfNonVestedShare
Namespace Prefix: | stm_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Number of non-option equity instruments exercised by participants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=stm_EmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=stm_TwoThousandThirteenChiefExecutiveOfficerSpecialBonusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=stm_EmployeePlanTwoThousandThirteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=stm_TwoThousandFourteenChiefExecutiveOfficerSpecialBonusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=stm_EmployeePlanTwoThousandFourteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=stm_TwoThousandFifteenChiefExecutiveOfficerSpecialBonusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=stm_EmployeePlanTwoThousandFifteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=stm_EmployeePlanTwoThousandSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=stm_SupervisoryBoardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=stm_TwoThousandFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=stm_TwoThousandSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=stm_TwoThousandSevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=stm_TwoThousandEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=stm_TwoThousandNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=stm_TwoThousandTenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=stm_TwoThousandElevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=stm_TwoThousandTwelveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |