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Business Combinations - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jul. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Loans and leases $ 306,627   $ 299,842  
Goodwill $ 23,869   $ 24,154 $ 9,818
Divestiture [Member]        
Business Acquisition [Line Items]        
Loans and leases   $ 425    
Deposits   $ 2,200