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Variable Interest Entities - Additional Information (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Maximum Exposure to Loss $ 6,647 $ 10,560  
Loans 77,625 82,917 $ 84,942
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   $ 3,362  
Third Party Loans [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loans 2,224    
Unfunded loan commitments $ 1,566