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ACCOUNTING POLICIES (Details 6) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Impact of revisions on previously issued consolidated statements of operations |  |  |
Other income (expense), net | $ (213)us-gaap_NonoperatingIncomeExpense | $ (223)us-gaap_NonoperatingIncomeExpense | $ (229)us-gaap_NonoperatingIncomeExpense
Income (loss) from continuing operations before income taxes | 575 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 450 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 73 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income (loss) from continuing operations | 908 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 339 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (18)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Net income (loss) | 903 us-gaap_ProfitLoss | 329 us-gaap_ProfitLoss | (79)us-gaap_ProfitLoss
Impact of previously issued balance sheets |  |  |
Other assets | 136 us-gaap_OtherAssetsNoncurrent | 185 us-gaap_OtherAssetsNoncurrent |
Total assets | 7,167 us-gaap_Assets | 6,957 us-gaap_Assets | 6,883 us-gaap_Assets
Accrued liabilities | 756 us-gaap_AccruedLiabilitiesCurrent | 778 us-gaap_AccruedLiabilitiesCurrent |
Other liabilities | 803 us-gaap_OtherLiabilitiesNoncurrent | 666 us-gaap_OtherLiabilitiesNoncurrent |
Correction |  |  |
Impact of previously issued balance sheets |  |  |
Accrued liabilities | (96)us-gaap_AccruedLiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Other liabilities | 96 us-gaap_OtherLiabilitiesNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Accounting for certain investments in private equity limited partnership funds | As Reported |  |  |
Impact of revisions on previously issued consolidated statements of operations |  |  |
Other income (expense), net |  | (239)us-gaap_NonoperatingIncomeExpense / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | (229)us-gaap_NonoperatingIncomeExpense / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Income (loss) from continuing operations before income taxes |  | 434 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 73 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Income (loss) from continuing operations |  | 323 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | (18)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net income (loss) |  | 313 us-gaap_ProfitLoss / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | (79)us-gaap_ProfitLoss / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Impact of previously issued balance sheets |  |  |
Other assets |  | 161 us-gaap_OtherAssetsNoncurrent / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Total assets |  | 6,933 us-gaap_Assets / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Accounting for certain investments in private equity limited partnership funds | Correction |  |  |
Impact of revisions on previously issued consolidated statements of operations |  |  |
Other income (expense), net |  | 16 us-gaap_NonoperatingIncomeExpense / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Income (loss) from continuing operations before income taxes |  | 16 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Income (loss) from continuing operations |  | 16 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Net income (loss) |  | 16 us-gaap_ProfitLoss / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Impact of previously issued balance sheets |  |  |
Other assets |  | 24 us-gaap_OtherAssetsNoncurrent / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Total assets |  | $ 24 us-gaap_Assets / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = mas_AccountingForCertainInvestmentsInPrivateEquityLimitedPartnershipFundsMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |

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