XML 37 R57.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

ACCOUNTING POLICIES - Noncontrolling Interest (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Hansgrohe SE |  |
Noncontrolling interest |  |
Ownership percentage of Hansgrohe SE | 68.00% | 68.00%

X
- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References No definition available. + Details
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix: | us-gaap_
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_SubsidiaryOrEquityMethodInvesteeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=mas_HansgroheSEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |