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Fair Value Measurements (Details 3) (Level 2, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of impaired loans $ 248cfsc_FairValueOfImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 $ 88cfsc_FairValueOfImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 $ 122cfsc_FairValueOfImpairedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member