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ACCOUNTING POLICIES - Stock Based Compensation (Details) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Period for recognition (in years) | 3 years

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- Definition Share-based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Period for Recognition + References No definition available. + Details
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Namespace Prefix: | mas_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration