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Variable Interest Entities - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Maximum exposure to loss $ 3,547 $ 3,541
Structured note vehicles [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Maximum exposure to loss $ 3,013 $ 3,013
Loans to Refinancing Special Purpose Entity [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Equity subordination in borrower's capital structure (percent) 15.00%  
Financial guarantee of outstanding debt by borrowers' parent (percent) 25.00%