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Segment Information Level 4 (Details) - EBITDA by Segment (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Earnings from unconsolidated entities, net of taxes $ 20us-gaap_IncomeLossFromEquityMethodInvestments $ 17us-gaap_IncomeLossFromEquityMethodInvestments $ 19us-gaap_IncomeLossFromEquityMethodInvestments
EPCD [Member]      
Segment Reporting Information [Line Items]      
Segment EBITDA [Line Items] 272msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
258msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
337msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
Earnings from unconsolidated entities, net of taxes         
FPD [Member]      
Segment Reporting Information [Line Items]      
Segment EBITDA [Line Items] 251msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
231msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
201msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
Earnings from unconsolidated entities, net of taxes       
FPD [Member] | Maximum [Member]      
Segment Reporting Information [Line Items]      
Earnings from unconsolidated entities, net of taxes        
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Segment EBITDA [Line Items] $ (73)msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ (67)msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ (48)msc_SegmentEbitda
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember