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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 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator:            
Net income $ 581 $ 612 $ 583 $ 548 $ 1,193 $ 1,131
Preferred stock dividends (25)   (25)   (49) (49)
Net income available to common shareholders $ 556   $ 558   $ 1,144 $ 1,082
Denominator:            
Weighted-average common shares outstanding—basic 939   934   938 936
Potential common shares 0   6   3 7
Weighted-average common shares outstanding—diluted 939   940   941 943
Earnings per common share:            
Basic $ 0.59   $ 0.60   $ 1.22 $ 1.16
Diluted $ 0.59   $ 0.59   $ 1.22 $ 1.15
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 8   6   5 4