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Significant Accounting Policies Level 4 (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Foreign Currency Transaction Gain (Loss), before Tax   $ 33us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 2us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 1us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Interest-bearing time deposits and other cash equivalents   46msc_InterestBearingTimeDepositsAndOtherCashEquivalents 29msc_InterestBearingTimeDepositsAndOtherCashEquivalents  
Short-term investments   7us-gaap_ShortTermInvestments 7us-gaap_ShortTermInvestments  
Inventory Valuation Reserves   8us-gaap_InventoryValuationReserves 8us-gaap_InventoryValuationReserves  
Unamortized Debt Issuance Expense   66us-gaap_UnamortizedDebtIssuanceExpense 78us-gaap_UnamortizedDebtIssuanceExpense  
Depreciation   130us-gaap_Depreciation 135us-gaap_Depreciation 140us-gaap_Depreciation
Asset Impairment Charges 5us-gaap_AssetImpairmentCharges 5us-gaap_AssetImpairmentCharges 124us-gaap_AssetImpairmentCharges 23us-gaap_AssetImpairmentCharges
Goodwill, Impairment Loss   57us-gaap_GoodwillImpairmentLoss    
Research and Development Expense   72us-gaap_ResearchAndDevelopmentExpense 73us-gaap_ResearchAndDevelopmentExpense 69us-gaap_ResearchAndDevelopmentExpense
Business realignment costs   47msc_BusinessRealignmentCosts 21msc_BusinessRealignmentCosts 35msc_BusinessRealignmentCosts
Concentration Risk, Percentage   10.00%us-gaap_ConcentrationRiskPercentage1    
EPCD [Member] | Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures [Member]        
Asset Impairment Charges       (15)us-gaap_AssetImpairmentCharges
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresMember
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
FPD [Member] | Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures [Member]        
Asset Impairment Charges       (6)us-gaap_AssetImpairmentCharges
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresMember
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
FPD [Member] | Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures - Customer Loss [Member]        
Asset Impairment Charges       $ (2)us-gaap_AssetImpairmentCharges
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresCustomerLossMember
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
Building [Member]        
Property, Plant and Equipment, Useful Life   20 years    
Machinery and Equipment [Member]        
Property, Plant and Equipment, Useful Life   15 years    
Minimum [Member]        
Property, Plant and Equipment, Useful Life   1 year    
Finite-Lived Intangible Asset, Useful Life   1 year    
Maximum [Member]        
Property, Plant and Equipment, Useful Life   5 years    
Finite-Lived Intangible Asset, Useful Life   30 years