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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 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Numerator:                
Net income $ 490 $ 501 $ 368 $ 490 $ 581 $ 612 $ 1,359 $ 1,683
Preferred stock dividends and other(1) (44)     (25)     (93) (74)
Stock Redeemed or Called During Period, Value 500              
Net income available to common shareholders $ 446     $ 465     $ 1,266 $ 1,609
Denominator:                
Weighted-average common shares outstanding—basic 914     939     917 938
Potential common shares 4     1     2 2
Weighted-average common shares outstanding—diluted 918     940     919 940
Earnings per common share:                
Basic $ 0.49     $ 0.49     $ 1.38 $ 1.72
Diluted $ 0.49     $ 0.49     $ 1.38 $ 1.71
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4     7     5 6
Retained Earnings                
Numerator:                
Net income $ 490 $ 501 $ 368 $ 490 $ 581 $ 612    
Stock Redeemed or Called During Period, Value $ 15