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Subsequent Events (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
May 31, 2022
USD ($)
Apr. 26, 2022
$ / shares
shares
May 03, 2022
USD ($)
Mar. 31, 2022
USD ($)
Subsequent Event [Line Items]        
Transferred securities from available for sale to held to maturity       $ 18,700
U.S. Treasury and government agencies        
Subsequent Event [Line Items]        
Transferred securities from available for sale to held to maturity       9,200
Residential mortgage-backed | Mortgage-backed Securities Agency        
Subsequent Event [Line Items]        
Transferred securities from available for sale to held to maturity       $ 9,500
Subsequent Event        
Subsequent Event [Line Items]        
Transferred securities from available for sale to held to maturity     $ 50,200  
Pretax unrealized loss included in AOCI     $ 3,900  
Subsequent Event | Senior Notes | Senior Bank Notes Due June 29, 2022        
Subsequent Event [Line Items]        
Debt instrument, face amount $ 750      
Debt instrument, distribution rate, percentage 2.875%      
Debt instrument, redemption ratio 1      
Subsequent Event | Series U Preferred Stock        
Subsequent Event [Line Items]        
Common stock activity (shares) | shares   1,000,000    
Depositary shares conversion ratio   0.01    
Fixed interest rate   6.00%    
Preferred stock, par or stated value per share (in dollars per share) | $ / shares   $ 1