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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator:        
Net income     $ 1,560 $ 2,083
Preferred stock dividends and other (1) $ (25) $ (27) (74) (97)
Net income available to common shareholders $ 404 $ 624 $ 1,486 $ 1,986
Denominator:        
Weighted-average common shares outstanding—basic (in shares) 934,000 955,000 936,000 958,000
Potential common shares (in shares) 6,000 7,000 6,000 7,000
Weighted-average common shares outstanding—diluted (in shares) 940,000 962,000 942,000 965,000
Earnings per common share:        
Basic (in dollars per share) $ 0.43 $ 0.65 $ 1.59 $ 2.07
Diluted (in dollars per share) $ 0.43 $ 0.65 $ 1.58 $ 2.06
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares) 5,000 4,000 4,000 4,000
PreferredStockIssuanceCostReductiontoNetIncome       $ 13
Document Fiscal Year Focus     2022