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%

Represents the percentage of a business planned for spinoff.

No definition available.

Name:	mas_BusinessPlannedForSpinoffPercentage
Namespace Prefix:	mas_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration