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Earnings Per Common Share (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 30, 2015
Antidilutive securities excluded from computation of earnings per share      
Repurchase and retirement of common stock cash aggregate to offset the dilutive effect $ 103us-gaap_PaymentsForRepurchaseOfCommonStock $ 39us-gaap_PaymentsForRepurchaseOfCommonStock  
Total consideration for repurchase of common stock including unpaid cash 106mas_TotalConsiderationForRepurchaseOfCommonStock    
Repurchase and retirement of common stock (in shares) 4,100,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares    
Remaining number of shares authorized to be repurchased 40,900,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased    
Dividends      
Cash dividends per common share paid (in dollars per share) $ 0.09us-gaap_CommonStockDividendsPerShareCashPaid $ 0.075us-gaap_CommonStockDividendsPerShareCashPaid  
Cash dividends per common share declared (in dollars per share) $ 0.09us-gaap_CommonStockDividendsPerShareDeclared $ 0.075us-gaap_CommonStockDividendsPerShareDeclared  
Subsequent Event      
Antidilutive securities excluded from computation of earnings per share      
Repurchase and retirement of common stock cash aggregate to offset the dilutive effect     $ 3us-gaap_PaymentsForRepurchaseOfCommonStock
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Stock Options      
Antidilutive securities excluded from computation of earnings per share      
Antidilutive effect on computation of diluted earnings per common share (in shares) 8,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
11,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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= us-gaap_EmployeeStockOptionMember
 
Long-term stock awards      
Antidilutive securities excluded from computation of earnings per share      
Repurchase and retirement of common stock to offset the dilutive impact of stock awards (in shares) 675,000mas_StockRepurchasedAndRetiredDuringPeriodToOffsetDilutiveImpactOfAwardsGrantedShares
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember