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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 Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Numerator:      
Net income $ 2,245 $ 2,521 $ 1,094
Preferred stock dividends and other(1) [1] (99) (121) (103)
Net income available to common shareholders $ 2,146 $ 2,400 $ 991
Denominator:      
Weighted-average common shares outstanding—basic 935,000 956,000 959,000
Potential common shares 7,000 7,000 3,000
Weighted-average common shares outstanding—diluted 942,000 963,000 962,000
Earnings per common share:      
Basic $ 2.29 $ 2.51 $ 1.03
Diluted $ 2.28 $ 2.49 $ 1.03
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4,000 4,000 7,000
Series A Preferred Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
PreferredStockIssuanceCostsReductiontoNetIncome   $ 13  
[1] Preferred stock dividends and other for the year ended December 31, 2021 includes $13 million of issuance costs associated with the redemption of Series A preferred shares in 2021.