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Discontinued Operations (Details)	Sep. 30, 2014
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

Name:	mas_BusinessPlannedForSpinoffPercentage
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

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsDisposedOfByMeansOtherThanSaleSpinoffMember
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: