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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, 2025
Jun. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator:            
Net income $ 569 $ 563 $ 490 $ 501 $ 1,622 $ 1,359
Preferred stock dividends and other (1) (21)   (44)   (75) (93)
Net income available to common shareholders $ 548   $ 446   $ 1,547 $ 1,266
Denominator:            
Weighted-average common shares outstanding—basic 890   914   898 917
Potential common shares 4   4   4 2
Weighted-average common shares outstanding—diluted 894   918   902 919
Earnings per common share:            
Basic $ 0.62   $ 0.49   $ 1.72 $ 1.38
Diluted $ 0.61   $ 0.49   $ 1.72 $ 1.38
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4   4   4 5
Series D(3)            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Excess of Redemption Amount Over Carrying Amount $ 4       $ 4  
Series B(2)            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Excess of Redemption Amount Over Carrying Amount     $ 15     $ 15