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EMPLOYEE RETIREMENT PLANS (Details 8) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Qualified  
Employee Retirement Plans  
2015 $ 47us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember
2016 48us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember
2017 48us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember
2018 49us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember
2019 50us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember
2020-2024 276us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesQualifiedPensionPlansOfUSEntityDefinedBenefitMember
Non-Qualified  
Employee Retirement Plans  
2015 12us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesNonQualifiedPensionPlansOfUSEntityDefinedBenefitMember
2016 12us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesNonQualifiedPensionPlansOfUSEntityDefinedBenefitMember
2017 12us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesNonQualifiedPensionPlansOfUSEntityDefinedBenefitMember
2018 12us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesNonQualifiedPensionPlansOfUSEntityDefinedBenefitMember
2019 13us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesNonQualifiedPensionPlansOfUSEntityDefinedBenefitMember
2020-2024 $ 61us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= mas_UnitedStatesNonQualifiedPensionPlansOfUSEntityDefinedBenefitMember