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Fair Value of Financial Investments and Liabilities - Additional Information (Detail) (USD $) In Billions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Estimated market value of long-term and short-term debt	$ 4.0	$ 4.0
Aggregate carrying value of long-term and short-term debt	$ 3.6	$ 3.6

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- Definition

Aggregate carrying value of long term and short term debt.

+ References

No definition available.

+ Details

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X

- Definition

Estimated market value of long term and short term debt.

+ References

No definition available.

+ Details

Name:	mas_EstimatedMarketValueOfLongTermAndShortTermDebt
Namespace Prefix:	mas_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
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