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ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details)	12 Months Ended
	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%

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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