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Acquisition, Divestiture, and Discontinued Operations - Additional Information (Details)
$ in Millions
3 Months Ended
May 04, 2018
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Jan. 16, 2019
Branch
Dec. 31, 2018
USD ($)
Disposal Group, Not Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on sale $ 73 $ 5      
Discontinued Operations [Member] | Government Guaranteed Loans [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loans included in divestiture     $ 1,000   $ 1,100
Laurel Road Bank [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of bank branches excluded from transaction | Branch       3