2.4.0.82418404 - Disclosure - EQUITY Reclassification adjustments out of Accumulated Other Comprehensive Income (Details)truefalseIn Millions, unless otherwise specifiedfalse1false USDfalsefalse$D2013Q2http://www.sec.gov/CIK0001452575duration2013-04-01T00:00:002013-06-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$D2012Q2SDhttp://www.sec.gov/CIK0001452575duration2012-04-01T00:00:002012-06-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$D2013Q2YTDhttp://www.sec.gov/CIK0001452575duration2013-01-01T00:00:002013-06-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDfalsefalse$D2012Q2YTDhttp://www.sec.gov/CIK0001452575duration2012-01-01T00:00:002012-06-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]2false 4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-3200000-3.2USD$falsetruefalse2truefalsefalse-500000-0.5USD$falsetruefalse3truefalsefalse-6200000-6.2USD$falsetruefalse4truefalsefalse5000000.5USD$falsetruefalsexbrli:monetaryItemTypemonetaryBefore tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e716-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e709-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 18, 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 31, 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax3false 4mjn_ReclassificationAdjustmentOutOfAociDeferredGainlossOnDerivativesQualifyingAsHedgesForwardExchangeContractTaxmjn_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse9000000.9USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse18000001.8USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryReclassification adjustment out of AOCI deferred gainloss on derivatives qualifying as hedges forward exchange contract - taxNo definition available.false2Reclassification adjustment out of AOCI deferred gainloss on derivatives qualifying as hedges forward exchange contract - tax4false 4mjn_ReclassificationAdjustmentOutOfAociDeferredGainlossOnDerivativesQualifyingAsHedgesForwardExchangeContractAfterTaxmjn_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-2300000-2.3USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-4400000-4.4USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryReclassification adjustment out of AOCI deferred gainloss on derivatives qualifying as hedges forward exchange contract - after taxNo definition available.false2Reclassification adjustment out of AOCI deferred gainloss on derivatives qualifying as hedges forward exchange contract - after tax5false 4us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse1050000010.5USD$falsefalsefalse2truefalsefalse1070000010.7USD$falsefalsefalse3truefalsefalse1940000019.4USD$falsefalsefalse4truefalsefalse1250000012.5USD$falsefalsefalsexbrli:monetaryItemTypemonetaryBefore tax amount of the income statement impact of the reclassification adjustment for actuarial gain (loss) recognized as a component of net periodic benefit cost.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580 false2Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax6false 4mjn_ReclassificationAdjustmentsOutOfAociTaxmjn_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse45000004.5USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse88000008.8USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryReclassification Adjustments out of AOCI - taxNo definition available.false2Reclassification Adjustments out of AOCI - tax7false 4mjn_ReclassificationAdjustmentsOutOfAociAfterTaxmjn_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-9200000-9.2USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-16800000-16.8USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryReclassification Adjustments out of AOCI - after taxNo definition available.false2Reclassification Adjustments out of AOCI - after tax8false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5false USDtruefalse$D2013Q2_mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxis_mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitActuarialGainsLossesMemberhttp://www.sec.gov/CIK0001452575duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseReclassification Adjustments out of AOCI Pension Other Postretirement Benefit Actuarial Gains Losses [Member]mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldimjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitActuarialGainsLossesMembermjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Reclassification Adjustments out of AOCI Pension Other Postretirement Benefit Actuarial Gains Losses [Member]9true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]10false 4mjn_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetBenefitCostTaxmjn_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse5000000.5USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse14000001.4USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryOther Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Benefit Cost-TaxNo definition available.false2Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Benefit Cost-Tax11false 4mjn_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetBenefitAfterTaxmjn_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-1700000-1.7USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-2800000-2.8USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryOther Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Benefit-after TaxNo definition available.false2Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Benefit-after Tax12false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse7false USDtruefalse$D2013Q2_mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxis_mjn_ReclassificationAdjustmentsOutOfAociPensionPostretirementBenefitSettlementsMemberhttp://www.sec.gov/CIK0001452575duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseReclassification Adjustments out of AOCI Pension Postretirement Benefit - settlements [Member]mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldimjn_ReclassificationAdjustmentsOutOfAociPensionPostretirementBenefitSettlementsMembermjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Reclassification Adjustments out of AOCI Pension Postretirement Benefit - settlements [Member]13true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]14false 4mjn_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetBenefitCostTaxmjn_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse31000003.1USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse56000005.6USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryOther Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Benefit Cost-TaxNo definition available.false2Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Benefit Cost-Tax15false 4mjn_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetBenefitAfterTaxmjn_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-5200000-5.2USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-9600000-9.6USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryOther Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Benefit-after TaxNo definition available.false2Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Benefit-after Tax16false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse9false USDtruefalse$D2013Q2_us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxis_us-gaap_SellingGeneralAndAdministrativeExpensesMemberhttp://www.sec.gov/CIK0001452575duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseSelling, General and Administrative Expenses [Member]us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SellingGeneralAndAdministrativeExpensesMemberus-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Selling, General and Administrative Expenses [Member]17true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]18false 4mjn_ReclassificationAdjustmentsOutOfAociPretaxmjn_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-1200000-1.2USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-2300000-2.3USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryReclassification adjustments out of AOCINo definition available.false2Reclassification adjustments out of AOCI - pretax19false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse11false USDtruefalse$D2013Q2_mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxis_mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitActuarialGainsLossesMember_us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxis_us-gaap_SellingGeneralAndAdministrativeExpensesMemberhttp://www.sec.gov/CIK0001452575duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseSelling, General and Administrative Expenses [Member]us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SellingGeneralAndAdministrativeExpensesMemberus-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisexplicitMemberfalsefalseReclassification Adjustments out of AOCI Pension Other Postretirement Benefit Actuarial Gains Losses [Member]mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldimjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitActuarialGainsLossesMembermjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Selling, General and Administrative Expenses [Member] | Reclassification Adjustments out of AOCI Pension Other Postretirement Benefit Actuarial Gains Losses [Member]20true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]21false 4us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse-1200000-1.2USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-2300000-2.3USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryBefore tax amount of the income statement impact of the reclassification adjustment for actuarial gain (loss) recognized as a component of net periodic benefit cost.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580 false2Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax22false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse13false USDtruefalse$D2013Q2_us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxis_us-gaap_OtherResearchAndDevelopmentExpenseMemberhttp://www.sec.gov/CIK0001452575duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseOther Research and Development Expense [Member]us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_OtherResearchAndDevelopmentExpenseMemberus-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Other Research and Development Expense [Member]23true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]24false 4mjn_ReclassificationAdjustmentsOutOfAociPretaxmjn_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-300000-0.3USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-500000-0.5USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryReclassification adjustments out of AOCINo definition available.false2Reclassification adjustments out of AOCI - pretax25false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse15false USDtruefalse$D2013Q2_mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxis_mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitActuarialGainsLossesMember_us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxis_us-gaap_OtherResearchAndDevelopmentExpenseMemberhttp://www.sec.gov/CIK0001452575duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseOther Research and Development Expense [Member]us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_OtherResearchAndDevelopmentExpenseMemberus-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisexplicitMemberfalsefalseReclassification Adjustments out of AOCI Pension Other Postretirement Benefit Actuarial Gains Losses [Member]mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldimjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitActuarialGainsLossesMembermjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Other Research and Development Expense [Member] | Reclassification Adjustments out of AOCI Pension Other Postretirement Benefit Actuarial Gains Losses [Member]26true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]27false 4us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse-300000-0.3USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-500000-0.5USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryBefore tax amount of the income statement impact of the reclassification adjustment for actuarial gain (loss) recognized as a component of net periodic benefit cost.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580 false2Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax28false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse17false USDtruefalse$D2013Q2_us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxis_us-gaap_OtherOperatingExpenseMemberhttp://www.sec.gov/CIK0001452575duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseOther Operating Expense [Member]us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_OtherOperatingExpenseMemberus-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Other Operating Expense [Member]29true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]30false 4mjn_ReclassificationAdjustmentsOutOfAociPretaxmjn_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-8300000-8.3USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-15200000-15.2USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryReclassification adjustments out of AOCINo definition available.false2Reclassification adjustments out of AOCI - pretax31false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse19false USDtruefalse$D2013Q2_mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxis_mjn_ReclassificationAdjustmentsOutOfAociPensionPostretirementBenefitSettlementsMember_us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxis_us-gaap_OtherOperatingExpenseMemberhttp://www.sec.gov/CIK0001452575duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseOther Operating Expense [Member]us-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_OtherOperatingExpenseMemberus-gaap_ComponentOfOtherOperatingCostAndExpenseGeneralAxisexplicitMemberfalsefalseReclassification Adjustments out of AOCI Pension Postretirement Benefit - settlements [Member]mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldimjn_ReclassificationAdjustmentsOutOfAociPensionPostretirementBenefitSettlementsMembermjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Other Operating Expense [Member] | Reclassification Adjustments out of AOCI Pension Postretirement Benefit - settlements [Member]32true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]33false 4us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse-8300000-8.3USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-15200000-15.2USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryBefore tax amount of the income statement impact of the reclassification adjustment for actuarial gain (loss) recognized as a component of net periodic benefit cost.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580 false2Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax34false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse21false USDtruefalse$D2013Q2_us-gaap_IncomeStatementLocationAxis_us-gaap_CostOfSalesMemberhttp://www.sec.gov/CIK0001452575duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseCost of Sales [Member]us-gaap_IncomeStatementLocationAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CostOfSalesMemberus-gaap_IncomeStatementLocationAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Cost of Sales [Member]35true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]36false 4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-3200000-3.2USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-6200000-6.2USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryBefore tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e716-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e709-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 18, 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 31, 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax37false 4mjn_ReclassificationAdjustmentsOutOfAociPretaxmjn_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-3900000-3.9USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-7600000-7.6USD$falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryReclassification adjustments out of AOCINo definition available.false2Reclassification adjustments out of AOCI - pretax38false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse23false USDtruefalse$D2013Q2_mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxis_mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitActuarialGainsLossesMember_us-gaap_IncomeStatementLocationAxis_us-gaap_CostOfSalesMemberhttp://www.sec.gov/CIK0001452575duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseCost of Sales [Member]us-gaap_IncomeStatementLocationAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CostOfSalesMemberus-gaap_IncomeStatementLocationAxisexplicitMemberfalsefalseReclassification Adjustments out of AOCI Pension Other Postretirement Benefit Actuarial Gains Losses [Member]mjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldimjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitActuarialGainsLossesMembermjn_ReclassificationAdjustmentsOutOfAociPensionOtherPostretirementBenefitPlansAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Cost of Sales [Member] | Reclassification Adjustments out of AOCI Pension Other Postretirement Benefit Actuarial Gains Losses [Member]39true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Equity Method Investments [Line Items]40false 4us-gaap_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse-700000-0.7USD$falsetruefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-1400000-1.4USD$falsetruefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryBefore tax amount of the income statement impact of the reclassification adjustment for actuarial gain (loss) recognized as a component of net periodic benefit cost.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580 false2Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before TaxfalseEQUITY Reclassification adjustments out of Accumulated Other Comprehensive Income (Details) (USD $)HundredThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.meadjohnson.com/role/EquityReclassificationAdjustmentsOutOfAccumulatedOtherComprehensiveIncomeDetails440