XML 22 R42.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Fair Value of Financial Investments (Details Textual) (USD $) | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Fair Value of Financial Investments and Liabilities (Textual) [Abstract] |  |
Aggregate carrying value of remaining private equity funds | $ 72,000,000 |
Estimated market value of long-term and short-term debt | 4,600,000,000 | 4,000,000,000
Aggregate carrying value of long-term and short-term debt | $ 4,400,000,000 | $ 4,000,000,000

X
- Definition Aggregate carrying value of long term and short term debt. + References No definition available. + Details
Name: | mas_AggregateCarryingValueOfLongTermAndShortTermDebt
Namespace Prefix: | mas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregate carrying value of remaining private equity funds. + References No definition available. + Details
Name: | mas_AggregateCarryingValueOfRemainingPrivateEquityFunds
Namespace Prefix: | mas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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
Name: | mas_FairValueOfFinancialInvestmentsAndLiabilitiesTextualAbstract
Namespace Prefix: | mas_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration