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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 $ 157us-gaap_Depreciation $ 175us-gaap_Depreciation $ 192us-gaap_Depreciation
Cabinets and Related Products and Plumbing Products segments      
Property and equipment      
Accelerated depreciation expenses   13mas_AcceleratedDepreciationExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mas_CabinetsAndRelatedProductsAndPlumbingProductsSegmentsMember
28mas_AcceleratedDepreciationExpense
/ us-gaap_StatementBusinessSegmentsAxis
= mas_CabinetsAndRelatedProductsAndPlumbingProductsSegmentsMember
Cabinets and Related Products      
Property and equipment      
Accelerated depreciation expenses $ 1mas_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