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Preferred Stock - Non-Cumulative Perpetual Preferred Stock (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]    
Liquidation Amount $ 488  
Carrying Amount, Issued $ 470 $ 96
Preferred stock, shares outstanding (in shares) 26,250  
Beginning on or after August 1, 2025 | LIBOR    
Class of Stock [Line Items]    
Basis spread on variable rate 4.262%  
Beginning on or after May 1, 2026 | LIBOR    
Class of Stock [Line Items]    
Basis spread on variable rate 4.92%  
Beginning on or after May 1, 2024 | LIBOR    
Class of Stock [Line Items]    
Basis spread on variable rate 3.859%  
Series A    
Class of Stock [Line Items]    
Annual Dividend Rate 6.20%  
Liquidation Amount $ 100  
Carrying Amount, Issued $ 96 96
Preferred stock, shares outstanding (in shares) 1,000  
Series B    
Class of Stock [Line Items]    
Annual Dividend Rate 6.625%  
Liquidation Amount $ 80  
Carrying Amount, Issued $ 77 0
Preferred stock, shares outstanding (in shares) 8,000  
Series C    
Class of Stock [Line Items]    
Annual Dividend Rate 6.60%  
Liquidation Amount $ 58  
Carrying Amount, Issued $ 59 0
Preferred stock, shares outstanding (in shares) 5,750  
Series D    
Class of Stock [Line Items]    
Annual Dividend Rate 6.10%  
Liquidation Amount $ 100  
Carrying Amount, Issued $ 93 0
Preferred stock, shares outstanding (in shares) 10,000  
Series E    
Class of Stock [Line Items]    
Annual Dividend Rate 6.50%  
Liquidation Amount $ 150  
Carrying Amount, Issued $ 145 $ 0
Preferred stock, shares outstanding (in shares) 1,500