v3.26.1
Equity Equity (Preferred Stock Classification) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
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   24,572,200
Preferred Stock, Shares Outstanding 24,572,200   24,572,200   24,572,200
Dividends, Preferred Stock, Cash $ 31 $ 31 $ 76 $ 97  
Equity, Class of Treasury Stock [Line Items]          
Treasury Stock, Shares, Acquired     18,790,334 23,515,546  
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
Dividends, Preferred Stock, Cash $ 7 8 $ 14 $ 17  
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
Dividends, Preferred Stock, Cash $ 0 0 $ 15 15  
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
Dividends, Preferred Stock, Cash $ 12 11 $ 23 22  
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
Dividends, Preferred Stock, Cash $ 12 12 $ 24 24  
Series G Preferred Stock          
Class of Stock [Line Items]          
Dividends, Preferred Stock, Cash $ 0 $ 0 $ 0 $ 19  
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 161,827,800   161,827,800   161,827,800
Preferred Stock, Shares Issued 0   0   0
Preferred Stock, Shares Outstanding 0   0   0