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Restructuring and Related Activities (Details)	9 Months Ended
	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