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Acquisitions (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2015	Mar. 31, 2015
UK Window Business
Acquisitions
Cash consideration	$ 16
Aquatic fitness business
Acquisitions
Cash consideration		$ 26

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Investing Activities



-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 13



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Details

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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mas_AquaticFitnessBusinessMember
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