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STOCK-BASED COMPENSATION (Details 6) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Phantom Stock Awards |  |  |
Stock-based compensation |  |  |
Recognized expense (income) related to valuation | $ 5 us-gaap_LiabilitiesFairValueAdjustment / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | $ 5 us-gaap_LiabilitiesFairValueAdjustment / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | $ 7 us-gaap_LiabilitiesFairValueAdjustment / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Stock award shares granted | 183,530 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 165,180 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 162,310 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Fair value of stock award granted | 4 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 3 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Cash paid to settle awards | 5 us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 4 us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 3 us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Accrued compensation cost liability | 13 mas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAccruedCompensationCostLiability / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 14 mas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAccruedCompensationCostLiability / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember |
Unrecognized compensation cost | 4 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 4 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember |
Equivalent common shares | 1,000,000 mas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEquivalentCommonShares / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 1,000,000 mas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEquivalentCommonShares / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember |
Phantom Stock Awards | Minimum |  |  |
Stock-based compensation |  |  |
Vesting period | 5 years |  |
Phantom Stock Awards | Maximum |  |  |
Stock-based compensation |  |  |
Vesting period | 10 years |  |
Stock Appreciation Rights |  |  |
Stock-based compensation |  |  |
Vesting period | 5 years |  |
Recognized expense (income) related to valuation | 1 us-gaap_LiabilitiesFairValueAdjustment / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 2 us-gaap_LiabilitiesFairValueAdjustment / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 4 us-gaap_LiabilitiesFairValueAdjustment / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Accrued compensation cost liability | $ 7 mas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAccruedCompensationCostLiability / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 8 mas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAccruedCompensationCostLiability / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
Equivalent common shares | 1,000,000 mas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEquivalentCommonShares / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 2,000,000 mas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEquivalentCommonShares / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |

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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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