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ACCOUNTING POLICIES (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property and equipment |  |  |
Depreciation expense | $ 157 us-gaap_Depreciation | $ 175 us-gaap_Depreciation | $ 192 us-gaap_Depreciation
Cabinets and Related Products and Plumbing Products segments |  |  |
Property and equipment |  |  |
Accelerated depreciation expenses |  | 13 mas_AcceleratedDepreciationExpense / us-gaap_StatementBusinessSegmentsAxis = mas_CabinetsAndRelatedProductsAndPlumbingProductsSegmentsMember | 28 mas_AcceleratedDepreciationExpense / us-gaap_StatementBusinessSegmentsAxis = mas_CabinetsAndRelatedProductsAndPlumbingProductsSegmentsMember
Cabinets and Related Products |  |  |
Property and equipment |  |  |
Accelerated depreciation expenses | $ 1 mas_AcceleratedDepreciationExpense / us-gaap_StatementBusinessSegmentsAxis = mas_CabinetsAndRelatedProductsMember |  |
Buildings | Minimum |  |  |
Property and equipment |  |  |
Annual depreciation rates (as a percent) | 2.00%mas_AnnualDepreciationRatePropertyAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Buildings | Maximum |  |  |
Property and equipment |  |  |
Annual depreciation rates (as a percent) | 10.00%mas_AnnualDepreciationRatePropertyAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Machinery and equipment | Minimum |  |  |
Property and equipment |  |  |
Annual depreciation rates (as a percent) | 5.00%mas_AnnualDepreciationRatePropertyAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Machinery and equipment | Maximum |  |  |
Property and equipment |  |  |
Annual depreciation rates (as a percent) | 33.00%mas_AnnualDepreciationRatePropertyAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition The portion of depreciation expense attributable to accelerated depreciation. + References No definition available. + Details
Name: | mas_AcceleratedDepreciationExpense
Namespace Prefix: | mas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Annual Depreciation Rate For Property and Equipment. + References No definition available. + Details
Name: | mas_AnnualDepreciationRatePropertyAndEquipment
Namespace Prefix: | mas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + 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) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mas_CabinetsAndRelatedProductsAndPlumbingProductsSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mas_CabinetsAndRelatedProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |