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Segment Information Level 4 (Details) - Reconciliation of Segment EBITDA to Net Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Business realignment costs $ (3)msc_BusinessRealignmentCostsAddBack $ (6)msc_BusinessRealignmentCostsAddBack
Integration costs 0msc_IntegrationCosts (2)msc_IntegrationCosts
Other (18)us-gaap_OtherExpenses (9)us-gaap_OtherExpenses
Total adjustments (24)msc_TotalAdjustments (20)msc_TotalAdjustments
Interest expense, net (77)us-gaap_InterestExpense (77)us-gaap_InterestExpense
Income tax expense (26)msc_IncomeTaxExpenseAddBack (6)msc_IncomeTaxExpenseAddBack
Depreciation and amortization (34)msc_DepreciationAndAmortizationAddBack (35)msc_DepreciationAndAmortizationAddBack
Net income (34)us-gaap_NetIncomeLoss (18)us-gaap_NetIncomeLoss
Epoxy, Phenolic and Coating Resins [Member]    
Segment Reporting Information [Line Items]    
Segment EBITDA [Line Items] 85msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember		 80msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
Forest Products Resins [Member]    
Segment Reporting Information [Line Items]    
Segment EBITDA [Line Items] 61msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember		 62msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
Corporate and Other [Member]    
Segment Reporting Information [Line Items]    
Segment EBITDA [Line Items] $ (19)msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ (22)msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember