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EARNINGS PER COMMON SHARE (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Numerator (basic and diluted):                      
Income (loss) from continuing operations $ 103us-gaap_IncomeLossFromContinuingOperations $ 542us-gaap_IncomeLossFromContinuingOperations $ 140us-gaap_IncomeLossFromContinuingOperations $ 76us-gaap_IncomeLossFromContinuingOperations $ 42us-gaap_IncomeLossFromContinuingOperations $ 111us-gaap_IncomeLossFromContinuingOperations $ 83us-gaap_IncomeLossFromContinuingOperations $ 62us-gaap_IncomeLossFromContinuingOperations $ 861us-gaap_IncomeLossFromContinuingOperations $ 298us-gaap_IncomeLossFromContinuingOperations $ (53)us-gaap_IncomeLossFromContinuingOperations
Less: Allocation to unvested restricted stock awards                 (17)us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities (7)us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities (2)us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities
Income (loss) from continuing operations attributable to common shareholders                 844mas_LossIncomeFromContinuingOperationsAttributableToCommonShareholders 291mas_LossIncomeFromContinuingOperationsAttributableToCommonShareholders (55)mas_LossIncomeFromContinuingOperationsAttributableToCommonShareholders
Loss from discontinued operations, net                 (5)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (10)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (61)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Loss from discontinued operations attributable to common shareholders                 (5)mas_IncomeLossFromDiscontinuedOperationsAttributableToCommonStockholders (10)mas_IncomeLossFromDiscontinuedOperationsAttributableToCommonStockholders (61)mas_IncomeLossFromDiscontinuedOperationsAttributableToCommonStockholders
Net income (loss) available to common shareholders                 $ 839us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 281us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (116)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:                      
Basic common shares (based upon weighted average) (in shares)                 349us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 350us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 349us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Add:                      
Stock option dilution (in shares)                 3us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 2us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements  
Diluted common shares (in shares)                 352us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 352us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 349us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding