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Severance and Early Retirement Programs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Asset Retirement Obligation Disclosure [Abstract] |  |
Charges related to severance and early retirement programs | $ 12 | $ 5

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

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- Details
Name: | us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration