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EMPLOYEE RETIREMENT PLANS (Details 4) (Qualified) | Dec. 31, 2014 | Dec. 31, 2013
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Employee Retirement Plans |  |
Weighted average asset allocation (as a percent) | 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations | 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Equity securities |  |
Employee Retirement Plans |  |
Weighted average asset allocation (as a percent) | 46.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember | 47.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember
Debt securities |  |
Employee Retirement Plans |  |
Weighted average asset allocation (as a percent) | 34.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember | 35.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember
Other |  |
Employee Retirement Plans |  |
Weighted average asset allocation (as a percent) | 20.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_OtherAssetsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember | 18.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_OtherAssetsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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