v3.26.1
Equity (Preferred Stock Dividends) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Class of Stock [Line Items]        
Preferred stock, aggregate dividends declared $ 25 $ 25 $ 51 $ 51
6.600% Non-Cumulative Preferred Stock, Series A        
Class of Stock [Line Items]        
Preferred stock, dividends declared per share $ 412.50 $ 412.50 $ 825.00 $ 825.00
Preferred stock, aggregate dividends declared $ 7 $ 7 $ 14 $ 14
6.750% Non-Cumulative Preferred Stock, Series B        
Class of Stock [Line Items]        
Preferred stock, dividends declared per share $ 421.88 $ 421.88 $ 843.76 $ 843.76
Preferred stock, aggregate dividends declared $ 7 $ 7 $ 14 $ 14
5.375% Non-Cumulative Preferred Stock, Series C        
Class of Stock [Line Items]        
Preferred stock, dividends declared per share $ 335.94 $ 335.94 $ 671.88 $ 671.88
Preferred stock, aggregate dividends declared $ 7 $ 7 $ 15 $ 15
4.625% Non-Cumulative Preferred Stock, Series D        
Class of Stock [Line Items]        
Preferred stock, dividends declared per share $ 289.06 $ 289.06 $ 578.12 $ 578.12
Preferred stock, aggregate dividends declared $ 4 $ 4 $ 8 $ 8