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Acquisition and Divestiture Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Nov. 16, 2020
May 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2021
Business Acquisition [Line Items]            
Gain (loss) on disposition of business     $ 5,740.0  
Discontinued Operations, Disposed of by Sale | BlackRock, Inc.            
Business Acquisition [Line Items]            
Discontinued operations, number of shares contributed   500,000        
Discontinued Operations, Disposed of by Sale | BlackRock, Inc. | Registered Secondary Offering            
Business Acquisition [Line Items]            
Stock repurchased (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        
Discontinued Operations, Disposed of by Sale | BlackRock, Inc. | BlackRock, Inc.            
Business Acquisition [Line Items]            
Stock repurchased (in shares)   2,650,000        
Sale of stock, price per share (in dollars per share)   $ 414.96        
BBVA USA Bancshares, Inc.            
Business Acquisition [Line Items]            
Business combination, consideration transferred $ 11,600.0          
Forecast | BBVA USA Bancshares, Inc.            
Business Acquisition [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