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ACQUISITIONS (Details) (Small U.K. door business, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Small U.K. door business
 
Acquisitions  
Total net cash purchase price of acquisition $ 4us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mas_UKDoorBusinessMember