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Earnings Per Common Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator:        
Net income $ 583 $ 790 $ 1,131 $ 1,432
Preferred stock dividends and other (1) (25) (42) (49) (70)
Net income available to common shareholders $ 558 $ 748 $ 1,082 $ 1,362
Denominator:        
Weighted-average common shares outstanding—basic (in shares) 934,000 958,000 936,000 959,000
Potential common shares (in shares) 6,000 7,000 7,000 8,000
Weighted-average common shares outstanding—diluted (in shares) 940,000 965,000 943,000 967,000
Earnings per common share:        
Basic (in dollars per share) $ 0.60 $ 0.78 $ 1.16 $ 1.42
Diluted (in dollars per share) $ 0.59 $ 0.77 $ 1.15 $ 1.41
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares) 6,000 4,000 4,000 4,000
Document Fiscal Year Focus     2022