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ACCOUNTING POLICIES (Details 5) (Hansgrohe SE)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Hansgrohe SE
   
Noncontrolling interest    
Ownership percentage of Hansgrohe SE 68.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mas_HansgroheSEMember
68.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mas_HansgroheSEMember