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Segment Information Level 4 (Details) - Depreciation by Segment (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Depreciation by Segment [Line Items]      
Depreciation and amortization $ 144us-gaap_DepreciationDepletionAndAmortization $ 148us-gaap_DepreciationDepletionAndAmortization $ 153us-gaap_DepreciationDepletionAndAmortization
EPCD [Member]      
Depreciation by Segment [Line Items]      
Depreciation and amortization 101us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
105us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
109us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
FPD [Member]      
Depreciation by Segment [Line Items]      
Depreciation and amortization 36us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
37us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
38us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
Corporate and Other [Member]      
Depreciation by Segment [Line Items]      
Depreciation and amortization $ 7us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ 6us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ 6us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember