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PROPERTY AND EQUIPMENT (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Leases      
Rental expense $ 102us-gaap_LeaseAndRentalExpense $ 93us-gaap_LeaseAndRentalExpense $ 94us-gaap_LeaseAndRentalExpense
2015 92us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 61us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 30us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 18us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 13us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
2020 and beyond 73us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Former owners and current management | Lease of operating facilities      
Operating Leases      
Rental expense to related parties $ 5us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= us-gaap_LeaseAgreementsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mas_FormerOwnersAndCurrentManagementMember
$ 6us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= us-gaap_LeaseAgreementsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mas_FormerOwnersAndCurrentManagementMember
$ 5us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= us-gaap_LeaseAgreementsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mas_FormerOwnersAndCurrentManagementMember