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Earnings Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Income (loss) from continuing operations, net of tax $ 3,327 $ (1,340)
Loss from discontinued operations, net of tax (2) 0
Net Income (Loss) 3,325 (1,340)
Dividends and undistributed earnings allocated to participating securities (28) (3)
Preferred stock dividends (61) (55)
Issuance cost for redeemed preferred stock 0 (22)
Net income (loss) available to common stockholders $ 3,236 $ (1,420)
Total weighted-average basic common shares outstanding 458,600 457,600
Effect of dilutive securities:    
Stock options 800 0
Other contingently issuable shares 700 0
Total effect of dilutive securities 1,500 0
Total weighted-average diluted common shares outstanding 460,100 457,600
Basic earnings per common share:    
Net income (loss) from continuing operations (in dollars per share) $ 7.06 $ (3.10)
Net income (loss) per basic common share (in dollars per share) 7.06 (3.10)
Diluted earnings per common share:    
Net income (loss) from continuing operations (in dollars per share) 7.03 (3.10)
Net income (loss) per diluted common share (in dollars per share) $ 7.03 $ (3.10)
Stock option    
Diluted earnings per common share:    
Anti-dilutive options excluded from the computation of diluted earnings per share (in shares) 103 1,600
Minimum exercise price range (in dollars per share)   $ 36.55
Maximum exercise price range   $ 86.34
Award    
Diluted earnings per common share:    
Anti-dilutive options excluded from the computation of diluted earnings per share (in shares)   2,800