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SEVERANCE COSTS (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
SEVERANCE COSTS. |  |  |
Severance and early retirement program costs | $ 29 mas_SeveranceAndRetirementCosts | $ 20 mas_SeveranceAndRetirementCosts | $ 35 mas_SeveranceAndRetirementCosts

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- Definition Represents one-time severance and early retirement costs that are not part of a restructuring plan nor associated with a discontinued operation. + References No definition available. + Details
Name: | mas_SeveranceAndRetirementCosts
Namespace Prefix: | mas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | mas_SeveranceCostsAbstract
Namespace Prefix: | mas_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration