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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 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator:                
Net income $ 490 $ 581 $ 612 $ 429 $ 583 $ 548 $ 1,683 $ 1,560
Preferred stock dividends (25)     (25)     (74) (74)
Net income available to common shareholders $ 465     $ 404     $ 1,609 $ 1,486
Denominator:                
Weighted-average common shares outstanding—basic 939     934     938 936
Potential common shares 1     6     2 6
Weighted-average common shares outstanding—diluted 940     940     940 942
Earnings per common share:                
Basic $ 0.49     $ 0.43     $ 1.72 $ 1.59
Diluted $ 0.49     $ 0.43     $ 1.71 $ 1.58
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 7     5     6 4