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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 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Numerator:            
Net income $ 501 $ 368 $ 581 $ 612 $ 869 $ 1,193
Preferred stock dividends (24)   (25)   (49) (49)
Net income available to common shareholders $ 477   $ 556   $ 820 $ 1,144
Denominator:            
Weighted-average common shares outstanding—basic 917   939   919 938
Potential common shares 1   0   1 3
Weighted-average common shares outstanding—diluted 918   939   920 941
Earnings per common share:            
Basic $ 0.52   $ 0.59   $ 0.89 $ 1.22
Diluted $ 0.52   $ 0.59   $ 0.89 $ 1.22
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 7   8   6 5