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Acquisitions and Discontinued Operations - Additional Information (Details)
$ in Millions
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 03, 2019
branch
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Goodwill $ 2,664   $ 2,664  
Discontinued operations | Government Guaranteed Loans        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loans included in divestiture $ 743   $ 865  
Laurel Road Bank        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of bank branches excluded from transaction | branch       3
Intangible assets acquired   $ 37    
Goodwill   $ 148