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Segment Information Level 4 (Details) - Capital Expenditures by Segment (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Capital Expenditures by Segment [Line Items]      
Capital Expenditures $ 183us-gaap_PaymentsForCapitalImprovements $ 145us-gaap_PaymentsForCapitalImprovements $ 133us-gaap_PaymentsForCapitalImprovements
EPCD [Member]      
Capital Expenditures by Segment [Line Items]      
Capital Expenditures 94us-gaap_PaymentsForCapitalImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
[1] 86us-gaap_PaymentsForCapitalImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
[1] 89us-gaap_PaymentsForCapitalImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
[1]
FPD [Member]      
Capital Expenditures by Segment [Line Items]      
Capital Expenditures 85us-gaap_PaymentsForCapitalImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
[1] 52us-gaap_PaymentsForCapitalImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
[1] 41us-gaap_PaymentsForCapitalImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
[1]
Corporate and Other [Member]      
Capital Expenditures by Segment [Line Items]      
Capital Expenditures $ 4us-gaap_PaymentsForCapitalImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
[1] $ 7us-gaap_PaymentsForCapitalImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
[1] $ 3us-gaap_PaymentsForCapitalImprovements
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
[1]
[1] Includes capitalized interest costs that are incurred during the construction of property and equipment.