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Goodwill and Intangibles Level 4 (Details) - Rollforward of Goodwill (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill, Acquired During Period $ 13us-gaap_GoodwillAcquiredDuringPeriod  
Goodwill, Translation Adjustments (6)us-gaap_GoodwillTranslationAdjustments 0us-gaap_GoodwillTranslationAdjustments
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 112us-gaap_Goodwill 169us-gaap_Goodwill
Goodwill, Ending Balance 119us-gaap_Goodwill 112us-gaap_Goodwill
Accumulated Foreign Currency Translation (6)msc_AccumulatedForeignCurrencyTranslation 0msc_AccumulatedForeignCurrencyTranslation
Goodwill, Impaired, Accumulated Impairment Loss (57)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (57)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
EPCD [Member]    
Goodwill [Line Items]    
Goodwill, Acquired During Period 13us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
 
Goodwill, Translation Adjustments (1)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
1us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 34us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
90us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
Goodwill, Ending Balance 46us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
34us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
Accumulated Foreign Currency Translation 2msc_AccumulatedForeignCurrencyTranslation
/ us-gaap_StatementBusinessSegmentsAxis
= msc_EpcdMember
3msc_AccumulatedForeignCurrencyTranslation
/ 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
FPD [Member]    
Goodwill [Line Items]    
Goodwill, Translation Adjustments (5)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
(1)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 78us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
79us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
Goodwill, Ending Balance 73us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
78us-gaap_Goodwill
/ 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, Impaired, Accumulated Impairment Loss $ 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember
$ 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= msc_FpdMember