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Acquisition and Divestiture Activity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Nov. 16, 2020
May 31, 2020
Mar. 31, 2020
Jun. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Cash provided by operating activities of discontinued operations     $ 126.0  
Discontinued Operations, Disposed of by Sale | BlackRock, Inc.        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Discontinued operations, number of shares contributed   500,000    
Registered Secondary Offering | Discontinued Operations, Disposed of by Sale | BlackRock, Inc.        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale of stock, number of shares issued in transaction (in shares)   31,600,000    
Sale of stock, price per share (in dollars per share)   $ 420    
Sale of stock, consideration received on transaction   $ 14,200.0    
Payments of stock issuance costs   200.0    
Gain (loss) on disposition of business   $ 4,300.0    
BlackRock, Inc. | Discontinued Operations, Disposed of by Sale | BlackRock, Inc.        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale of stock, number of shares issued in transaction (in shares)   2,650,000    
Sale of stock, price per share (in dollars per share)   $ 414.96    
BBVA USA Bancshares, Inc.        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Business combination, consideration transferred $ 11,600.0      
BBVA USA Bancshares, Inc. | Forecast        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Business combination, recognized identifiable assets acquired and liabilities assumed, assets       $ 102,000.0
Business combination, recognized identifiable assets acquired and liabilities assumed, deposits       86,000.0
Business combination, recognized identifiable assets acquired and liabilities assumed, loans       $ 66,000.0