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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
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator:      
Net income $ 2,074 $ 2,245 $ 2,521
Preferred stock dividends and other (1) (98) (99) (121)
Net income available to common shareholders $ 1,976 $ 2,146 $ 2,400
Denominator:      
Weighted-average common shares outstanding—basic 936 935 956
Potential common shares 2 7 7
Weighted-average common shares outstanding—diluted 938 942 963
Earnings per common share:      
Basic $ 2.11 $ 2.29 $ 2.51
Diluted $ 2.11 $ 2.28 $ 2.49
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 6 4  
Series A Preferred Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
PreferredStockIssuanceCostsReductiontoNetIncome     $ 13