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Other Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2012 lawsuits
Other Commitments and Contingencies (Textual) [Abstract] |
Number of insulation installation contractors certified by the federal court in Atlanta | 377
Amount paid for claims settlement | $ 75

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- Definition Loss contingency settlement agreement consideration payable. + References No definition available. + Details
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Namespace Prefix: | mas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Number of insulation contractors certified. + References No definition available. + Details
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Namespace Prefix: | mas_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | mas_
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Period Type: | duration