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Earnings 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, 2025
Mar. 31, 2024
Numerator:    
Net income $ 490 $ 368
Preferred stock dividends (25) (25)
Net income available to common shareholders $ 465 $ 343
Denominator:    
Weighted-average common shares outstanding—basic 906 921
Potential common shares 4 2
Weighted-average common shares outstanding—diluted 910 923
Earnings per common share:    
Basic $ 0.51 $ 0.37
Diluted $ 0.51 $ 0.37
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2 5