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Severance and Early Retirement Program - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Severance and early retirement program costs	$ 20	$ 4	$ 25	$ 6

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Severance And Retirement Costs

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