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FAIR VALUE OF FINANCIAL INVESTMENTS AND LIABILITIES (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income from financial investments, net and impairment charges |  |  |
Equity investment (loss) income, net | $ (2,000,000)us-gaap_IncomeLossFromEquityMethodInvestments | $ 16,000,000 us-gaap_IncomeLossFromEquityMethodInvestments |
Income from financial investments, net | 2,000,000 mas_IncomeFromInvestments | 27,000,000 mas_IncomeFromInvestments | 22,000,000 mas_IncomeFromInvestments
Estimated market value of long-term and short-term debt | 3,700,000,000 us-gaap_DebtInstrumentFairValue | 3,700,000,000 us-gaap_DebtInstrumentFairValue |
Aggregate carrying value of long-term and short-term debt | 3,400,000,000 us-gaap_DebtLongtermAndShorttermCombinedAmount | 3,400,000,000 us-gaap_DebtLongtermAndShorttermCombinedAmount |
Private equity funds |  |  |
Income from financial investments, net and impairment charges |  |  |
Realized gains from private equity funds | 4,000,000 us-gaap_RealizedInvestmentGainsLosses / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember | 11,000,000 us-gaap_RealizedInvestmentGainsLosses / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember | 24,000,000 us-gaap_RealizedInvestmentGainsLosses / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember
Impairment of private equity funds |  |  | $ 2,000,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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