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Equity Equity (Preferred Stock Classification) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 15, 2025
Sep. 30, 2024
Dec. 31, 2024
Class of Stock [Line Items]            
Preferred Stock, Shares Authorized 200,000,000   200,000,000     200,000,000
Preferred Stock, Shares Issued 24,572,200   24,572,200     25,572,200
Preferred Stock, Shares Outstanding 24,572,200   24,572,200     25,572,200
Preferred stock, Liquidation Preference, Value $ 2,905,000,000   $ 2,905,000,000     $ 3,905,000,000
Preferred Stock Redemption Premium $ 12,000,000 $ 0 $ 12,000,000   $ 0  
Preferred Stock, Par or Stated Value Per Share $ 0.01   $ 0.01     $ 0.01
Stock Redeemed or Called During Period, Shares       1,000,000    
Equity, Class of Treasury Stock [Line Items]            
Treasury Stock, Shares, Acquired     29,852,023   39,373,496  
Floating Rate Non-Cumulative Preferred Stock, Series A, par value $0.01            
Class of Stock [Line Items]            
Preferred Stock, Shares Authorized 27,600,000   27,600,000     27,600,000
Preferred Stock, Shares Issued 24,000,000   24,000,000     24,000,000
Preferred Stock, Shares Outstanding 24,000,000   24,000,000     24,000,000
Series D Preferred Stock            
Class of Stock [Line Items]            
Preferred Stock, Shares Authorized 500,000   500,000     500,000
Preferred Stock, Shares Issued 500,000   500,000     500,000
Preferred Stock, Shares Outstanding 500,000   500,000     500,000
Series E Preferred Stock            
Class of Stock [Line Items]            
Preferred Stock, Shares Authorized 32,200   32,200     32,200
Preferred Stock, Shares Issued 32,200   32,200     32,200
Preferred Stock, Shares Outstanding 32,200   32,200     32,200
Series F Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred Stock, Shares Authorized 40,000   40,000     40,000
Preferred Stock, Shares Issued 40,000   40,000     40,000
Preferred Stock, Shares Outstanding 40,000   40,000     40,000
Series G Preferred Stock            
Class of Stock [Line Items]            
Preferred Stock, Shares Authorized 1,000,000   1,000,000     1,000,000
Preferred Stock, Shares Issued 0   0     1,000,000
Preferred Stock, Shares Outstanding 0   0     1,000,000
Preferred Stock, Dividend Rate, Percentage     3.85%      
Preferred stock, Liquidation Preference, Value $ 1,000   $ 1,000 $ 1,000    
Preferred Stock, Redemption Amount       1,000,000,000    
Preferred Stock Redemption Premium       $ 12,000,000    
Preferred Stock, Par or Stated Value Per Share $ 0.01   $ 0.01      
Series A Junior Preferred Stock            
Class of Stock [Line Items]            
Preferred Stock, Shares Authorized 10,000,000   10,000,000     10,000,000
Preferred Stock, Shares Issued 0   0     0
Preferred Stock, Shares Outstanding 0   0     0
Not Designated Preferred Stock            
Class of Stock [Line Items]            
Preferred Stock, Shares Authorized 160,827,800   160,827,800     160,827,800
Preferred Stock, Shares Issued 0   0     0
Preferred Stock, Shares Outstanding 0   0     0