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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, 2023
Mar. 31, 2022
Numerator:    
Net income $ 612 $ 548
Preferred stock dividends and other (24) (24)
Net income available to common shareholders $ 588 $ 524
Denominator:    
Weighted-average common shares outstanding—basic 935 938
Potential common shares 7 9
Weighted-average common shares outstanding—diluted 942 947
Earnings per common share:    
Basic $ 0.63 $ 0.56
Diluted $ 0.62 $ 0.55
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3 3