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Severance and Early Retirement Program - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Severance and early retirement program costs | $ 20 | $ 4 | $ 25 | $ 6

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- Definition Severance And Retirement Costs + References No definition available. + Details
Name: | mas_SeveranceAndRetirementCosts
Namespace Prefix: | mas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration