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Summarized Financial Information of Unconsolidated Affiliate Level 4 (Details) - HAI Balance Sheets (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
HAI Summarized Financial Information [Line Items]    
Current Assets $ 38msc_CurrentAssetsOfUnconsolidatedAffiliate $ 36msc_CurrentAssetsOfUnconsolidatedAffiliate
Non-current assets 26msc_NonCurrentAssetsOfUnconsolidatedAffiliate 26msc_NonCurrentAssetsOfUnconsolidatedAffiliate
Current Liabilities 16msc_CurrentLiabilitiesOfUnconsolidatedAffiliate 19msc_CurrentLiabilitiesOfUnconsolidatedAffiliate
Non-current liabilities $ 2msc_NonCurrentLiabilitiesOfUnconsolidatedAffiliate $ 0msc_NonCurrentLiabilitiesOfUnconsolidatedAffiliate