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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

Name:	mas_ProductWarrantyAccrualIncreaseInExpectedFutureWarrantyClaims
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

Name:	us-gaap_SupplyCommitmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration