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Business Combinations - Narative (Details) - USD ($)
$ in Millions
Jul. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Loans and leases   $ 314,825 $ 299,842  
Goodwill   $ 23,882 $ 24,154 $ 9,818
Divestiture [Member] | Subsequent Event        
Business Acquisition [Line Items]        
Loans and leases $ 425      
Deposits $ 2,200