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Equity (Preferred Stock Dividends) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Class of Stock [Line Items]    
Preferred stock, aggregate dividends declared $ 26 $ 27
6.600% Non-Cumulative Preferred Stock, Series A    
Class of Stock [Line Items]    
Preferred stock, dividends declared per share $ 412.50 $ 412.50
Preferred stock, aggregate dividends declared $ 7 $ 7
6.750% Non-Cumulative Preferred Stock, Series B    
Class of Stock [Line Items]    
Preferred stock, dividends declared per share $ 421.88 $ 421.88
Preferred stock, aggregate dividends declared $ 7 $ 7
5.375% Non-Cumulative Preferred Stock, Series C    
Class of Stock [Line Items]    
Preferred stock, dividends declared per share $ 335.94 $ 335.94
Preferred stock, aggregate dividends declared $ 8 $ 8
4.625% Non-Cumulative Preferred Stock, Series D    
Class of Stock [Line Items]    
Preferred stock, dividends declared per share $ 289.06 $ 395.05
Preferred stock, aggregate dividends declared $ 4 $ 5