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OTHER COMMITMENTS AND CONTINGENCIES (Details) (Private equity funds, capital calls, Maximum, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Private equity funds, capital calls | Maximum
 
Other Commitments and Contingencies  
Company's obligation to make capital additional contributions $ 9us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= mas_PrivateEquityFundsCapitalCallsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember