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OTHER COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified |  | 3 Months Ended
--- | --- | ---
Dec. 31, 2013 Private equity funds, capital calls Maximum | Sep. 30, 2012 Other Specialty Products
Other Commitments and Contingencies |  |
Increase in expected future warranty claims |  | $ 12
Company's obligation to make capital additional contributions | $ 14 |

X
- Definition Represents increase in accrual for expected future warranty claims based upon an analysis prepared by the entity. + References No definition available. + Details
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Namespace Prefix: | mas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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