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Goodwill and Intangibles Level 4 (Details) - Schedule of Goodwill (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]      
Goodwill, Gross $ 182us-gaap_GoodwillGross $ 169us-gaap_GoodwillGross  
Goodwill, Impaired, Accumulated Impairment Loss (57)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (57)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss  
Accumulated Foreign Currency Translation (6)msc_AccumulatedForeignCurrencyTranslation 0msc_AccumulatedForeignCurrencyTranslation  
Goodwill 119us-gaap_Goodwill 112us-gaap_Goodwill 169us-gaap_Goodwill
EPCD [Member]      
Goodwill [Line Items]      
Goodwill, Gross 101us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
88us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
 
Goodwill, Impaired, Accumulated Impairment Loss (57)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
(57)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
 
Accumulated Foreign Currency Translation 2msc_AccumulatedForeignCurrencyTranslation
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
3msc_AccumulatedForeignCurrencyTranslation
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
 
Goodwill 46us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
34us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
90us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
FPD [Member]      
Goodwill [Line Items]      
Goodwill, Gross 81us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
81us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
 
Goodwill, Impaired, Accumulated Impairment Loss 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
 
Accumulated Foreign Currency Translation (8)msc_AccumulatedForeignCurrencyTranslation
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
(3)msc_AccumulatedForeignCurrencyTranslation
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
 
Goodwill $ 73us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
$ 78us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
$ 79us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember