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Commitments and Contingencies Level 4 (Details) - Annual Purchase Commitments (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Long-term Purchase Commitment [Line Items]  
P2015Y $ 276us-gaap_PurchaseObligationDueInNextTwelveMonths
P2016Y 287us-gaap_PurchaseObligationDueInSecondYear
P2017Y 61us-gaap_PurchaseObligationDueInThirdYear
P2018Y 53us-gaap_PurchaseObligationDueInFourthYear
P2019Y 53us-gaap_PurchaseObligationDueInFifthYear
2020 and beyond 160us-gaap_PurchaseObligationDueAfterFifthYear
Total minimum payments 890us-gaap_PurchaseObligation
Less: Amount representing interest (64)us-gaap_UnrecordedUnconditionalPurchaseObligationImputedInterest
Present Value of Minimum Payments $ 826msc_PresentValueOfMinimumPayments