2.2.0.25truefalse4120 - Disclosure - Postemployment benefit plans (Details)truefalseIn Millions, unless otherwise specifiedfalse1falsefalseUSDtruefalse{us-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxis} : US Separation Programs {us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : U.S. Pension Benefits 1/1/2009 - 12/31/2009 USD ($) $D2009_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember_USSeparationProgramsMemberhttp://www.sec.gov/CIK0000018230duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseUS Separation Programsus-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxisxbrldihttp://xbrl.org/2006/xbrldicat_USSeparationProgramsMemberus-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxisexplicitMemberfalsefalseU.S. Pension Benefitsus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2falsefalseUSDtruefalse{us-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxis} : US Separation Programs {us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Other Postretirement Benefits 1/1/2009 - 12/31/2009 USD ($) $D2009_OtherPostretirementBenefitPlansDefinedBenefitMember_USSeparationProgramsMemberhttp://www.sec.gov/CIK0000018230duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseUS Separation Programsus-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxisxbrldihttp://xbrl.org/2006/xbrldicat_USSeparationProgramsMemberus-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxisexplicitMemberfalsefalseOther Postretirement Benefitsus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3falsefalseUSDtruefalse{us-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxis} : Non-U.S. Separation Programs {us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Other Postretirement Benefits 1/1/2009 - 12/31/2009 USD ($) $D2009_OtherPostretirementBenefitPlansDefinedBenefitMember_NonUSMemberhttp://www.sec.gov/CIK0000018230duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseNon-U.S. Separation Programsus-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxisxbrldihttp://xbrl.org/2006/xbrldicat_NonUSMemberus-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxisexplicitMemberfalsefalseOther Postretirement Benefitsus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDtruefalse{us-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxis} : Non-U.S. Separation Programs {us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Non-U.S. Pension Benefits 12/1/2009 - 12/31/2009 USD ($) $D2009Q4_M12_ForeignPensionPlansDefinedBenefitMember_NonUSMemberhttp://www.sec.gov/CIK0000018230duration2009-12-01T00:00:002009-12-31T00:00:00falsefalseNon-U.S. Separation Programsus-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxisxbrldihttp://xbrl.org/2006/xbrldicat_NonUSMemberus-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxisexplicitMemberfalsefalseNon-U.S. Pension Benefitsus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignPensionPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5falsefalseUSDtruefalse{us-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxis} : Non-U.S. Separation Programs {us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Non-U.S. Pension Benefits 1/1/2009 - 12/31/2009 USD ($) $D2009_ForeignPensionPlansDefinedBenefitMember_NonUSMemberhttp://www.sec.gov/CIK0000018230duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseNon-U.S. Separation Programsus-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxisxbrldihttp://xbrl.org/2006/xbrldicat_NonUSMemberus-gaap_RestructuringAndRelatedCostByTypeOfRestructuringAxisexplicitMemberfalsefalseNon-U.S. Pension Benefitsus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignPensionPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : U.S. Pension Benefits 12/31/2010 USD ($) $I2010_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMemberhttp://www.sec.gov/CIK0000018230instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseU.S. Pension Benefitsus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$7falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : U.S. Pension Benefits 8/31/2010 USD ($) $I2010Q3_M0831_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMemberhttp://www.sec.gov/CIK0000018230instant2010-08-31T00:00:000001-01-01T00:00:00falsefalseU.S. Pension Benefitsus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Other Postretirement Benefits 12/31/2010 USD ($) $I2010_OtherPostretirementBenefitPlansDefinedBenefitMemberhttp://www.sec.gov/CIK0000018230instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOther Postretirement Benefitsus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$9falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Other Postretirement Benefits 12/31/2009 USD ($) $I2009_OtherPostretirementBenefitPlansDefinedBenefitMemberhttp://www.sec.gov/CIK0000018230instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseOther Postretirement Benefitsus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Other Postretirement Benefits 3/31/2009 USD ($) $I2009Q1_M0331_OtherPostretirementBenefitPlansDefinedBenefitMemberhttp://www.sec.gov/CIK0000018230instant2009-03-31T00:00:000001-01-01T00:00:00falsefalseOther Postretirement Benefitsus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2true0us-gaap_DefinedBenefitPlanDisclosureLineItemsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringLine 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.falsefalse3false0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailmentsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse127000000127falsetruefalsetruefalse2truefalsefalse5500000055falsetruefalsetruefalse3truefalsefalse10000001falsetruefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of net gain or loss recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 88 -Paragraph 6 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h falsefalse4false0cat_DefinedBenefitPlanRecognizedInRetirementPensionAndOtherPostretirementBenefitscatfalsecreditdurationThe amount of net gain or loss recognized in retirement pension benefit costs.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse60000006falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of net gain or loss recognized in retirement pension benefit costs.No authoritative reference available.falsefalse5false0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5truefalsefalse3400000034falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of net (gain) loss recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 88 -Paragraph 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h falsefalse6false0us-gaap_DefinedBenefitPlanSpecialTerminationBenefitsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4truefalsefalse20000002falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 88 -Paragraph 15 falsefalse7true0us-gaap_DefinedBenefitPlanPlanAmendmentAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse8false0cat_MinimumAgeOfRetireesThatWillBeImpactedByPlanAmendmentcatfalsenainstantThis element represents the minimum age of retirees that will be impacted by the plan amendment.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9truefalsefalse6565falsefalsefalsetruefalse10truefalsefalse6565falsefalsefalsetruefalseOtherxbrli:integerItemTypeintegerThis element represents the minimum age of retirees that will be impacted by the plan amendment.No authoritative reference available.falsefalse9false0us-gaap_DefinedBenefitPlanEffectOfPlanAmendmentOnAccumulatedBenefitObligationus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7truefalsefalse13200000001320falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9truefalsefalse-101000000-101falsefalsefalsetruefalse10truefalsefalse-432000000-432falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of increase or decrease in the accumulated benefit obligation related to the effects of a change in the substantive terms of an existing defined benefit pension plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph r falsefalse10false0cat_DefinedBenefitPlanEffectOfPlanAmendmentOnAccumulatedOtherComprehensiveIncomeAfterTaxcatfalsecreditinstantThis element represents the increase or decrease in accumulated other comprehensive income after tax due to re-measurement of...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7truefalsefalse-831000000-831falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9truefalsefalse6400000064falsefalsefalsetruefalse10truefalsefalse272000000272falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the increase or decrease in accumulated other comprehensive income after tax due to re-measurement of the plan following its amendment.No authoritative reference available.falsefalse11false0cat_DefinedBenefitPlanCurtailmentGainLossDueToPlanAmendmentscatfalsecreditinstantThis element represents the curtailment losses due to change in the substantive terms of an existing other postretirement...falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6truefalsefalse2800000028falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the curtailment losses due to change in the substantive terms of an existing other postretirement benefit plan or the initiation of a new plan.No authoritative reference available.falsefalse12false0cat_PeriodForAmortizingDecreaseInPostretirementLiabilitiesDueToPlanAmendmentscatfalsenainstantThis element represents the period over which the decrease in liability due to the plan amendment will be amortized into...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse007Y7Yfalsefalsefalsetruefalse10falsefalsefalse007Y7YfalsefalsefalsetruefalseOtherus-types:durationStringItemTypenormalizedstringThis element represents the period over which the decrease in liability due to the plan amendment will be amortized into earnings.No authoritative reference available.falsefalse13false0us-gaap_DefinedBenefitPlanEffectOfPlanAmendmentOnNetPeriodicBenefitCostus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1falsefalsefalse00falsefalsefalsetruefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8truefalsefalse110000000110falsetruefalsetruefalse9truefalsefalse6000000060falsetruefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of increase or decrease in net periodic benefit cost related to the effects of a change in the substantive terms of an existing defined benefit plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph r falsefalse1012Postemployment benefit plans (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruetrue