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ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Other Intangible Assets |
Period of operation forecasts used in impairment test | 5 years
Weighted average cost of capital (as a percent) | 8.00%
Minimum |
Goodwill and Other Intangible Assets |
Assumed annual growth rate of cash flows (as a percent) | 2.00%
Maximum |
Goodwill and Other Intangible Assets |
Assumed annual growth rate of cash flows (as a percent) | 3.00%
Measurement Input, Discount Rate | Minimum |
Goodwill and Other Intangible Assets |
Goodwill, measurement input | 10.00%
Measurement Input, Discount Rate | Maximum |
Goodwill and Other Intangible Assets |
Goodwill, measurement input | 12.00%
Measurement Input, Discount Rate | Assets, Total | Minimum |
Goodwill and Other Intangible Assets |
Discount rate on estimated discounted cash flows (as a percent) | 11.00%
Measurement Input, Discount Rate | Assets, Total | Maximum |
Goodwill and Other Intangible Assets |
Discount rate on estimated discounted cash flows (as a percent) | 12.50%

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- Definition Assumed Annual Growth Rate Of Cash Flows + References No definition available. + Details
Name: | mas_AssumedAnnualGrowthRateOfCashFlows
Namespace Prefix: | mas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Goodwill, Measurement Input + References No definition available. + Details
Name: | mas_GoodwillMeasurementInput
Namespace Prefix: | mas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Indefinite-lived Intangible Assets, Measurement Input + References No definition available. + Details
Name: | mas_IndefinitelivedIntangibleAssetsMeasurementInput
Namespace Prefix: | mas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of the operation forecasts used in impairment test. + References No definition available. + Details
Name: | mas_PeriodOfOperationForecastsUsedInImpairmentTest
Namespace Prefix: | mas_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the entity's weighted average cost of capital. + References No definition available. + Details
Name: | mas_WeightedAverageCostOfCapital
Namespace Prefix: | mas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_AssetsTotalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |