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Restructuring and Related Activities (Details) | 9 Months Ended
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Sep. 30, 2014
Restructuring and Related Activities |
Percentage of spin off of Installation and Other Services businesses | 100.00%

X
- Definition Represents the percentage of spin off of the entity's Installation and Other Services business into a publicly-traded company. + References No definition available. + Details
Name: | mas_StockholdersEquitySpinoffPercentage
Namespace Prefix: | mas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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