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Earnings (Loss) Per Common Share (Computation Of Basic And Diluted Earnings (Loss) Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Numerator:    
Net income $ 368 $ 612
Preferred stock dividends (25) (24)
Net income available to common shareholders $ 343 $ 588
Denominator:    
Weighted-average common shares outstanding—basic 921 935
Potential common shares 2 7
Weighted-average common shares outstanding—diluted 923 942
Earnings per common share:    
Basic $ 0.37 $ 0.63
Diluted $ 0.37 $ 0.62
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 5 3