Represents the number of major customers.

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- Definition

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- Definition

Intra Company Sales Between Segments In Percentage

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- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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No definition available.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (b)

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-03.1)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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SEGMENT INFORMATION (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Information
Export sales from U.S. included in net sales									$ 228mas_ExportSaleFromDomesticCountry	$ 227mas_ExportSaleFromDomesticCountry	$ 229mas_ExportSaleFromDomesticCountry
Intra-company sales between segments in percentage									2.00%	2.00%	2.00%
Net sales	2,064us-gaap_SalesRevenueNet	2,232us-gaap_SalesRevenueNet	2,260us-gaap_SalesRevenueNet	1,965us-gaap_SalesRevenueNet	1,998us-gaap_SalesRevenueNet	2,150us-gaap_SalesRevenueNet	2,149us-gaap_SalesRevenueNet	1,876us-gaap_SalesRevenueNet	8,521us-gaap_SalesRevenueNet	8,173us-gaap_SalesRevenueNet	7,495us-gaap_SalesRevenueNet
Impairment charge for other intangible assets									1		42
US
Segment Information
Long-lived assets	2,611				2,685				2,611	2,685	2,792
Europe
Segment Information
Long-lived assets	428				481				428	481	467
Plumbing Products
Segment Information
Net sales									3,308	3,183	2,955
Decorative Architectural Products
Segment Information
Net sales									1,998	1,927	1,818
Other Specialty Products
Segment Information
Net sales									701	637	574
Impairment charges for other intangible assets											42
Sales \| US
Segment Information
Net sales									6,689	6,359	5,793
Sales \| Customer concentration risk \| One customer \| Cabinets and Related Products, Plumbing Products, Decorative Architectural Products and Other Specialty Products segments
Segment Information
Number of major customers									1	1	1
Net sales									$ 2,319	$ 2,280	$ 2,143