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Severance and Early Retirement Programs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Asset Retirement Obligation Disclosure [Abstract]
Charges related to severance and early retirement programs	$ 12	$ 5

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- Definition

Severance And Other Charges

+ References

No definition available.

+ Details

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Namespace Prefix:	mas_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration