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Debt (Details) (Credit Agreement dated March 28, 2013, USD $) | Sep. 30, 2014 | Mar. 28, 2013
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Credit Agreement dated March 28, 2013 |  |
Debt |  |
Borrowing capacity, maximum |  | $ 1,250,000,000
Additional borrowing capacity | 1,200,000,000 |
Absorption of reduction to shareholders' equity to remain in compliance with covenant | 859,000,000 |
Amount borrowed | $ 0 |

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- Definition Under the line of credit covenant's limit on debt to total capitalization ratio, permitted additional borrowing capacity beyond amounts already drawn as of the balance sheet date. + References No definition available. + Details
Name: | mas_LineOfCreditCovenantAdditionalBorrowingCapacity
Namespace Prefix: | mas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Under the line of credit covenant's limit on debt to total capitalization ratio, amount of reduction in shareholders equity that the entity could absorb and still be in compliance as of the balance sheet date. + References No definition available. + Details
Name: | mas_LineOfCreditCovenantPotentialReductionInEquityThatWouldMaintainCompliance
Namespace Prefix: | mas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant