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SHAREHOLDERS' EQUITY (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
SHAREHOLDERS' EQUITY    
Cumulative translation adjustments $ 325us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ 418us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Unrealized loss on marketable securities, net (12)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (12)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Unrealized loss on interest rate swaps (18)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (19)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Unrecognized prior service cost and net loss, net (406)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (272)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated other comprehensive (loss) income (111)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 115us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Income tax expense on unrealized loss on marketable securities 14mas_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTaxExpenseBenefit 14mas_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTaxExpenseBenefit
Income tax benefit on unrealized loss on interest rate swap securities 1mas_AccumulatedOtherComprehensiveIncomeLossInterestRateSwapsAdjustmentTaxExpenseBenefit  
Income tax benefit on prior service cost and net loss $ 199mas_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxBenefitExpense $ 105mas_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxBenefitExpense