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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
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares) 4,000   4,000  
Numerator:        
Net income (loss) $ 790 $ (214) $ 1,432 $ (52)
Preferred stock dividends and other (1) (42) [1] (23) (70) [1] (46)
Net income (loss) available to common shareholders $ 748 $ (237) $ 1,362 $ (98)
Denominator:        
Weighted-average common shares outstanding—basic (in shares) 958,000 960,000 959,000 958,000
Potential common shares (in shares) 7,000 0 8,000 0
Weighted-average common shares outstanding—diluted (in shares) 965,000 960,000 967,000 958,000
Earnings per common share:        
Basic (in dollars per share) $ 0.78 $ (0.25) $ 1.42 $ (0.10)
Diluted (in dollars per share) $ 0.77 $ (0.25) $ 1.41 $ (0.10)
Series A Preferred Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
PreferredStockIssuanceCostsReductiontoNetIncome $ 13   $ 13  
[1] Preferred stock dividends and other for the three and six months ended June 30, 2021 includes $13 million of issuance costs associated with the redemption of Series A preferred shares. See Note 5 for additional information.