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Acquisition and Divestiture Activity (PCD Loan Activity) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 01, 2021
Jun. 30, 2021
Jun. 30, 2021
Business Acquisition [Line Items]      
ACL at acquisition   $ (1,115) $ (1,115)
BBVA USA Bancshares, Inc.      
Business Acquisition [Line Items]      
Principal Balance $ 10,253    
ACL at acquisition (1,161)    
Non-credit premium 224    
Purchase price $ 9,316