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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income $ 1,777 $ 1,790 $ 3,654 $ 4,181
Dividends and undistributed earnings allocated to participating securities (28) (28) (60) (67)
Preferred stock dividends (57) (57) (171) (171)
Net income available to common stockholders $ 1,692 $ 1,705 $ 3,423 $ 3,943
Total weighted-average basic common shares outstanding (in shares) 383,000 382,500 382,800 382,700
Effect of dilutive securities:        
Stock options (in shares) 100 100 200 100
Other contingently issuable shares (in shares) 600 700 700 800
Total effect of dilutive securities (in shares) 700 800 900 900
Total weighted-average diluted common shares outstanding (in shares) 383,700 383,300 383,700 383,600
Basic earnings per common share:        
Net income per basic common share (in dollars per share) $ 4.42 $ 4.46 $ 8.94 $ 10.31
Diluted earnings per common share:        
Net income per diluted common share (in dollars per share) $ 4.41 $ 4.45 $ 8.92 $ 10.28
Award        
Diluted earnings per common share:        
Anti-dilutive options excluded from the computation of diluted earnings per share (in shares) 0 0 43 13