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v3.5.0.2

Discontinued Operations (Details) | Sep. 30, 2014
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Spinoff | TopBuild | Installation and Other Services |
Selected financial information of discontinued operations |
Percentage of businesses planned for spinoff | 100.00%

X
- Definition Represents the percentage of a business planned for spinoff. + References No definition available. + Details
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Namespace Prefix: | mas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=mas_TopbuildMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mas_InstallationAndOtherServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |