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SHAREHOLDERS' EQUITY (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014
SHAREHOLDERS' EQUITY |  |  |  |  |
Number of shares authorized to be repurchased for retirement |  |  |  |  | 50,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Remaining number of shares authorized to be repurchased | 45,000,000 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased | 45,000,000 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |  |
Repurchase and retirement of common stock (in shares) | 5,000,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |  |  |
Repurchase and retirement of common stock | $ 119 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 158 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 35 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 8 us-gaap_PaymentsForRepurchaseOfCommonStock |
Repurchase and retirement of common stock to offset the dilutive impact of the grant of long-term stock awards (shares) |  | 1,700,000 mas_StockRepurchasedAndRetiredDuringPeriodToOffsetDilutiveImpactOfLongTermStockAwardsShares | 1,700,000 mas_StockRepurchasedAndRetiredDuringPeriodToOffsetDilutiveImpactOfLongTermStockAwardsShares | 1,000,000 mas_StockRepurchasedAndRetiredDuringPeriodToOffsetDilutiveImpactOfLongTermStockAwardsShares |
Repurchase and retirement of common stock to offset the dilutive impact of the grant of long-term stock awards |  | $ 39 mas_PaymentsForRepurchaseOfCommonStockToOffsetDilutiveImpactOfLongTermStockAwards | $ 35 mas_PaymentsForRepurchaseOfCommonStockToOffsetDilutiveImpactOfLongTermStockAwards | $ 8 mas_PaymentsForRepurchaseOfCommonStockToOffsetDilutiveImpactOfLongTermStockAwards |
Cash dividends per common share paid (in dollars per share) |  | $ 0.33 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.30 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.30 us-gaap_CommonStockDividendsPerShareCashPaid |
Cash dividends per common share declared (in dollars per share) |  | $ 0.345 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.3 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.3 us-gaap_CommonStockDividendsPerShareDeclared |
Long-term stock awards |  |  |  |  |
Stock-based compensation |  |  |  |  |
Grant of long-term stock awards |  | 1,729,800 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 2,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 1,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |

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