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Variable Interest Entities - Additional Information (Details) - Structured Note Vehicles [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Loss on structured note settlement $ 39  
Carrying value of structured note vehicle 1,524  
Trading Assets [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Carrying value of structured note vehicle $ 1,293 $ 501