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Variable Interest Entities - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Maximum Exposure to Loss $ 8,233 $ 8,448
Asset-backed commercial paper conduits [Member]
   
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Maximum Exposure to Loss $ 2,303 $ 2,560