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Fair Value Level 4 (Details) - Nonrecurring Fair Value Measurements of Long-lived assets held and used (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset impairments   $ 5us-gaap_ImpairmentOfLongLivedAssetsHeldForUse $ 111us-gaap_ImpairmentOfLongLivedAssetsHeldForUse $ 23us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Impairment of Long-Lived Assets to be Disposed of     13us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf 0us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Asset Impairment Charges 5us-gaap_AssetImpairmentCharges 5us-gaap_AssetImpairmentCharges 124us-gaap_AssetImpairmentCharges 23us-gaap_AssetImpairmentCharges
epoxy [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying Value of Long-Lived Assets held and Used   5msc_CarryingValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpoxyMember
207msc_CarryingValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpoxyMember
 
Fair Value of Long-Lived Assets held and Used   0msc_FairValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpoxyMember
103msc_FairValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpoxyMember
 
Asset Impairment Charges   (5)us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpoxyMember
(104)us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpoxyMember
 
Discount rate for probability-weighted forecast model     14.00%msc_DiscountRateForProbabilityWeightedForecastModel
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpoxyMember
 
Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures - Customer Loss [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying Value of Long-Lived Assets held and Used       22msc_CarryingValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_FairValueByMeasurementFrequencyAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresCustomerLossMember
Fair Value of Long-Lived Assets held and Used       20msc_FairValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_FairValueByMeasurementFrequencyAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresCustomerLossMember
Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures - Customer Loss [Member] | Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate for probability-weighted forecast model       2.00%msc_DiscountRateForProbabilityWeightedForecastModel
/ us-gaap_FairValueByMeasurementFrequencyAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresCustomerLossMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures - Customer Loss [Member] | Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate for probability-weighted forecast model       10.00%msc_DiscountRateForProbabilityWeightedForecastModel
/ us-gaap_FairValueByMeasurementFrequencyAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresCustomerLossMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying Value of Long-Lived Assets held and Used       26msc_CarryingValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_FairValueByMeasurementFrequencyAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresMember
Fair Value of Long-Lived Assets held and Used       5msc_FairValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_FairValueByMeasurementFrequencyAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresMember
Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures [Member] | Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate for probability-weighted forecast model       2.00%msc_DiscountRateForProbabilityWeightedForecastModel
/ us-gaap_FairValueByMeasurementFrequencyAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures [Member] | Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate for probability-weighted forecast model       3.00%msc_DiscountRateForProbabilityWeightedForecastModel
/ us-gaap_FairValueByMeasurementFrequencyAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures - Customer Loss [Member] | FPD [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges       (2)us-gaap_AssetImpairmentCharges
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresCustomerLossMember
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures [Member] | EPCD [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges       (15)us-gaap_AssetImpairmentCharges
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresMember
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
Long-Lived Assets Held and Used - Qualitative Factors to Fair Value Measures [Member] | FPD [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges       (6)us-gaap_AssetImpairmentCharges
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= msc_LongLivedAssetsHeldAndUsedQualitativeFactorsToFairValueMeasuresMember
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
Long-Lived Assets Held and Used [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying Value of Long-Lived Assets held and Used     8msc_CarryingValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_FairValueByAssetClassAxis
= msc_LongLivedAssetsHeldAndUsedMember
 
Fair Value of Long-Lived Assets held and Used     1msc_FairValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_FairValueByAssetClassAxis
= msc_LongLivedAssetsHeldAndUsedMember
 
Long-Lived Assets Held and Used [Member] | EPCD [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges     (7)us-gaap_AssetImpairmentCharges
/ us-gaap_FairValueByAssetClassAxis
= msc_LongLivedAssetsHeldAndUsedMember
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
 
Long-Lived Assets Held for Sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying Value of Long-Lived Assets held and Used     13msc_CarryingValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_FairValueByAssetClassAxis
= msc_LongLivedAssetsHeldForSaleMember
 
Fair Value of Long-Lived Assets held and Used     0msc_FairValueOfLongLivedAssetsHeldAndUsed
/ us-gaap_FairValueByAssetClassAxis
= msc_LongLivedAssetsHeldForSaleMember
 
Long-Lived Assets Held for Sale [Member] | EPCD [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset Impairment Charges     $ (13)us-gaap_AssetImpairmentCharges
/ us-gaap_FairValueByAssetClassAxis
= msc_LongLivedAssetsHeldForSaleMember
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember