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Guarantor Non-Guarantor Subsidiary Financial Information Level 4 (Details) - Consolidating Statement of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net cash provided by (used in) operating activities $ (50)us-gaap_NetCashProvidedByUsedInOperatingActivities $ 80us-gaap_NetCashProvidedByUsedInOperatingActivities $ 177us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows provided by (used in) investing activities      
Capital expenditures (183)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (144)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (133)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Payments to Acquire Businesses, Net of Cash Acquired (64)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Proceeds from the sale of (purchases of) debt securities, net (1)msc_ProceedsFromSaleOfPurchasesOfDebtSecuritiesNet (3)msc_ProceedsFromSaleOfPurchasesOfDebtSecuritiesNet 2msc_ProceedsFromSaleOfPurchasesOfDebtSecuritiesNet
Change in restricted cash (3)us-gaap_IncreaseDecreaseInRestrictedCash 4us-gaap_IncreaseDecreaseInRestrictedCash (15)us-gaap_IncreaseDecreaseInRestrictedCash
disbursement of affiliated loan (50)msc_Disbursementofaffiliatedloan    
repayment of affiliated loan 50msc_Repaymentofaffiliatedloan    
Funds remitted to unconsolidated affiliates (2)us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest (13)us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest (3)us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
Proceeds from sale of assets 20us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 7us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 11us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Capital contribution to subsidiary 0msc_CapitalContributionToSubsidiary 0msc_CapitalContributionToSubsidiary 0msc_CapitalContributionToSubsidiary
Return of capital from subsidiary   0msc_ReturnOfCapitalFromSubsidiary  
Return of capital from subsidiary from sales of accounts receivable 0msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable 0msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable 0msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
Net cash (used in) provided by investing activities (233)us-gaap_NetCashProvidedByUsedInInvestingActivities (150)us-gaap_NetCashProvidedByUsedInInvestingActivities (138)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows (used in) provided by financing activities      
Net short-term debt (repayments) borrowings 21us-gaap_ProceedsFromRepaymentsOfShortTermDebt 15us-gaap_ProceedsFromRepaymentsOfShortTermDebt (7)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Borrowings of long-term debt 391us-gaap_ProceedsFromIssuanceOfLongTermDebt 1,135us-gaap_ProceedsFromIssuanceOfLongTermDebt 453us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repayments of long-term debt (343)us-gaap_RepaymentsOfLongTermDebt (1,058)us-gaap_RepaymentsOfLongTermDebt (487)us-gaap_RepaymentsOfLongTermDebt
Repayment of advance from affiliates 0msc_RepaymentOfAdvanceFromAffiliates 0msc_RepaymentOfAdvanceFromAffiliates (7)msc_RepaymentOfAdvanceFromAffiliates
Net Intercompany Loan Borrowings (Repayments) 0msc_NetIntercompanyLoanBorrowingsRepayments 0msc_NetIntercompanyLoanBorrowingsRepayments 0msc_NetIntercompanyLoanBorrowingsRepayments
Long Term Debt and Credit Facility Financing Fees     (14)msc_LongTermDebtAndCreditFacilityFinancingFees
Capital contribution from parent 0us-gaap_ProceedsFromContributionsFromParent 0us-gaap_ProceedsFromContributionsFromParent 16us-gaap_ProceedsFromContributionsFromParent
Long-term debt and credit facility financing fees 0us-gaap_PaymentsOfFinancingCosts (40)us-gaap_PaymentsOfFinancingCosts (14)us-gaap_PaymentsOfFinancingCosts
Common stock dividends paid 0us-gaap_PaymentsOfDividendsCommonStock 0us-gaap_PaymentsOfDividendsCommonStock (11)us-gaap_PaymentsOfDividendsCommonStock
Return of capital to parent from sales of accounts receivable 0msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable 0msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable 0msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
Net cash used in financing activities 69us-gaap_NetCashProvidedByUsedInFinancingActivities 52us-gaap_NetCashProvidedByUsedInFinancingActivities (59)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rates on cash and cash equivalents (9)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (4)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 5us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Decrease in cash and cash equivalents (223)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (22)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (15)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents (unrestricted) at beginning of period 379us-gaap_Cash 401us-gaap_Cash 416us-gaap_Cash
Cash and cash equivalents (unrestricted) at end of period 156us-gaap_Cash 379us-gaap_Cash 401us-gaap_Cash
Momentive Specialty Chemicals Inc. [Member]      
Net cash provided by (used in) operating activities (426)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(173)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
14us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash flows provided by (used in) investing activities      
Capital expenditures (89)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(75)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(57)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Payments to Acquire Businesses, Net of Cash Acquired (52)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Proceeds from the sale of (purchases of) debt securities, net 0msc_ProceedsFromSaleOfPurchasesOfDebtSecuritiesNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0msc_ProceedsFromSaleOfPurchasesOfDebtSecuritiesNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0msc_ProceedsFromSaleOfPurchasesOfDebtSecuritiesNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Change in restricted cash 0us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
disbursement of affiliated loan 0msc_Disbursementofaffiliatedloan
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
repayment of affiliated loan 0msc_Repaymentofaffiliatedloan
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Funds remitted to unconsolidated affiliates 0us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from sale of assets 20us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Capital contribution to subsidiary (30)msc_CapitalContributionToSubsidiary
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(31)msc_CapitalContributionToSubsidiary
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(30)msc_CapitalContributionToSubsidiary
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Return of capital from subsidiary   48msc_ReturnOfCapitalFromSubsidiary
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Return of capital from subsidiary from sales of accounts receivable 350msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
214msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
87msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash (used in) provided by investing activities 199us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
156us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash flows (used in) provided by financing activities      
Net short-term debt (repayments) borrowings 7us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Borrowings of long-term debt 295us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,109us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
450us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repayments of long-term debt (256)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(665)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(278)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repayment of advance from affiliates     (7)msc_RepaymentOfAdvanceFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net Intercompany Loan Borrowings (Repayments) 34msc_NetIntercompanyLoanBorrowingsRepayments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(493)msc_NetIntercompanyLoanBorrowingsRepayments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(113)msc_NetIntercompanyLoanBorrowingsRepayments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Long Term Debt and Credit Facility Financing Fees     (14)msc_LongTermDebtAndCreditFacilityFinancingFees
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Capital contribution from parent 0us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
16us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Long-term debt and credit facility financing fees   (40)us-gaap_PaymentsOfFinancingCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Common stock dividends paid 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Return of capital to parent from sales of accounts receivable 0msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash used in financing activities 80us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(89)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
41us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Effect of exchange rates on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Decrease in cash and cash equivalents (147)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(106)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
64us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents (unrestricted) at beginning of period 170us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
276us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
212us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents (unrestricted) at end of period 23us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
170us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
276us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Combined Subsidiary Guarantors [Member]      
Net cash provided by (used in) operating activities 14us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
23us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
16us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash flows provided by (used in) investing activities      
Capital expenditures 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Payments to Acquire Businesses, Net of Cash Acquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Proceeds from the sale of (purchases of) debt securities, net 0msc_ProceedsFromSaleOfPurchasesOfDebtSecuritiesNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0msc_ProceedsFromSaleOfPurchasesOfDebtSecuritiesNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0msc_ProceedsFromSaleOfPurchasesOfDebtSecuritiesNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Change in restricted cash 0us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_IncreaseDecreaseInRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
disbursement of affiliated loan 0msc_Disbursementofaffiliatedloan
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
repayment of affiliated loan 0msc_Repaymentofaffiliatedloan
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Funds remitted to unconsolidated affiliates 0us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from sale of assets 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Capital contribution to subsidiary (20)msc_CapitalContributionToSubsidiary
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(20)msc_CapitalContributionToSubsidiary
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(19)msc_CapitalContributionToSubsidiary
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Return of capital from subsidiary   31msc_ReturnOfCapitalFromSubsidiary
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Return of capital from subsidiary from sales of accounts receivable 0msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash (used in) provided by investing activities (20)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
11us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(19)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash flows (used in) provided by financing activities      
Net short-term debt (repayments) borrowings 0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Borrowings of long-term debt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Repayments of long-term debt 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Repayment of advance from affiliates     0msc_RepaymentOfAdvanceFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net Intercompany Loan Borrowings (Repayments) 0msc_NetIntercompanyLoanBorrowingsRepayments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(2)msc_NetIntercompanyLoanBorrowingsRepayments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(3)msc_NetIntercompanyLoanBorrowingsRepayments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Long Term Debt and Credit Facility Financing Fees     0msc_LongTermDebtAndCreditFacilityFinancingFees
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Capital contribution from parent 20us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
20us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
19us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Long-term debt and credit facility financing fees   0us-gaap_PaymentsOfFinancingCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Common stock dividends paid (14)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(21)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(13)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Return of capital to parent from sales of accounts receivable 0msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash used in financing activities 6us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(34)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Effect of exchange rates on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Decrease in cash and cash equivalents 0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents (unrestricted) at beginning of period 0us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents (unrestricted) at end of period 0us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Combined Non-Guarantor Subsidiaries [Member]      
Net cash provided by (used in) operating activities 376us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
251us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
160us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash flows provided by (used in) investing activities      
Capital expenditures (94)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
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(3)msc_ProceedsFromSaleOfPurchasesOfDebtSecuritiesNet
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disbursement of affiliated loan (50)msc_Disbursementofaffiliatedloan
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repayment of affiliated loan 50msc_Repaymentofaffiliatedloan
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(13)us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
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(3)us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
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7us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
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2us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
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0msc_CapitalContributionToSubsidiary
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0msc_CapitalContributionToSubsidiary
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Return of capital from subsidiary   0msc_ReturnOfCapitalFromSubsidiary
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0msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
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0msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
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15us-gaap_ProceedsFromRepaymentsOfShortTermDebt
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(7)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
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26us-gaap_ProceedsFromIssuanceOfLongTermDebt
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3us-gaap_ProceedsFromIssuanceOfLongTermDebt
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(209)us-gaap_RepaymentsOfLongTermDebt
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Net Intercompany Loan Borrowings (Repayments) (34)msc_NetIntercompanyLoanBorrowingsRepayments
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495msc_NetIntercompanyLoanBorrowingsRepayments
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116msc_NetIntercompanyLoanBorrowingsRepayments
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Long Term Debt and Credit Facility Financing Fees     0msc_LongTermDebtAndCreditFacilityFinancingFees
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31us-gaap_ProceedsFromContributionsFromParent
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30us-gaap_ProceedsFromContributionsFromParent
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Long-term debt and credit facility financing fees   0us-gaap_PaymentsOfFinancingCosts
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Common stock dividends paid 0us-gaap_PaymentsOfDividendsCommonStock
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0us-gaap_PaymentsOfDividendsCommonStock
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0us-gaap_PaymentsOfDividendsCommonStock
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(214)msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
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(87)msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
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5us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
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84us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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(79)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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Cash and cash equivalents (unrestricted) at beginning of period 209us-gaap_Cash
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125us-gaap_Cash
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204us-gaap_Cash
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209us-gaap_Cash
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125us-gaap_Cash
/ dei_LegalEntityAxis
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Eliminations [Member]      
Net cash provided by (used in) operating activities (14)us-gaap_NetCashProvidedByUsedInOperatingActivities
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(21)us-gaap_NetCashProvidedByUsedInOperatingActivities
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(13)us-gaap_NetCashProvidedByUsedInOperatingActivities
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Cash flows provided by (used in) investing activities      
Capital expenditures 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
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0us-gaap_IncreaseDecreaseInRestrictedCash
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0us-gaap_IncreaseDecreaseInRestrictedCash
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disbursement of affiliated loan 0msc_Disbursementofaffiliatedloan
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repayment of affiliated loan 0msc_Repaymentofaffiliatedloan
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Funds remitted to unconsolidated affiliates 0us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
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0us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
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0us-gaap_InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest
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0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
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0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
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51msc_CapitalContributionToSubsidiary
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49msc_CapitalContributionToSubsidiary
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Return of capital from subsidiary   (79)msc_ReturnOfCapitalFromSubsidiary
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Return of capital from subsidiary from sales of accounts receivable (350)msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
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(214)msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
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(87)msc_ReturnOfCapitalFromSubsidiaryFromSalesOfAccountsReceivable
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Net cash (used in) provided by investing activities (300)us-gaap_NetCashProvidedByUsedInInvestingActivities
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(38)us-gaap_NetCashProvidedByUsedInInvestingActivities
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Cash flows (used in) provided by financing activities      
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0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
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0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
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Borrowings of long-term debt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt
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0us-gaap_ProceedsFromIssuanceOfLongTermDebt
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0us-gaap_ProceedsFromIssuanceOfLongTermDebt
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Repayments of long-term debt    0us-gaap_RepaymentsOfLongTermDebt
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0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
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Repayment of advance from affiliates     0msc_RepaymentOfAdvanceFromAffiliates
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Net Intercompany Loan Borrowings (Repayments) 0msc_NetIntercompanyLoanBorrowingsRepayments
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0msc_NetIntercompanyLoanBorrowingsRepayments
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0msc_NetIntercompanyLoanBorrowingsRepayments
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Long Term Debt and Credit Facility Financing Fees     0msc_LongTermDebtAndCreditFacilityFinancingFees
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Capital contribution from parent (50)us-gaap_ProceedsFromContributionsFromParent
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(51)us-gaap_ProceedsFromContributionsFromParent
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(49)us-gaap_ProceedsFromContributionsFromParent
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Long-term debt and credit facility financing fees   0us-gaap_PaymentsOfFinancingCosts
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Common stock dividends paid 14us-gaap_PaymentsOfDividendsCommonStock
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Return of capital to parent from sales of accounts receivable 350msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
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214msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
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87msc_ReturnOfCapitalToParentFromSalesOfAccountsReceivable
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Net cash used in financing activities 314us-gaap_NetCashProvidedByUsedInFinancingActivities
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263us-gaap_NetCashProvidedByUsedInFinancingActivities
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Effect of exchange rates on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
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0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
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0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
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0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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Cash and cash equivalents (unrestricted) at beginning of period 0us-gaap_Cash
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0us-gaap_Cash
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0us-gaap_Cash
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Cash and cash equivalents (unrestricted) at end of period $ 0us-gaap_Cash
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$ 0us-gaap_Cash
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