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Earnings Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Net income $ 4,750 $ 4,887 $ 7,360
Dividends and undistributed earnings allocated to participating securities (77) (77) (88)
Preferred stock dividends (228) (228) (228)
Net income available to common stockholders $ 4,445 $ 4,582 $ 7,044
Total weighted-average basic common shares outstanding (in shares) 382,700,000 382,400,000 391,800,000
Effect of dilutive securities:      
Stock options (in shares) 200,000 100,000 300,000
Other contingently issuable shares (in shares) 700,000 900,000 1,100,000
Total effect of dilutive securities (in shares) 900,000 1,000,000.0 1,400,000
Total weighted-average diluted common shares outstanding (in shares) 383,600,000 383,400,000 393,200,000
Basic earnings per common share:      
Net income from continuing operations (in dollars per share) $ 11.60 $ 11.98 $ 17.98
Income (loss) from discontinued operations (in dollars per share) 0.01 0.00 0.00
Net income per basic common share (in dollars per share) 11.61 11.98 17.98
Diluted earnings per common share:      
Net income from continuing operations (in dollars per share) 11.58 11.95 17.91
Income (loss) from discontinued operations (in dollars per share) 0.01 0.00 0.00
Net income per diluted common share (in dollars per share) $ 11.59 $ 11.95 $ 17.91
Award      
Diluted earnings per common share:      
Anti-dilutive options excluded from the computation of diluted earnings per share (in shares) 32,000 27,000 24,000
Stock options      
Diluted earnings per common share:      
Anti-dilutive options excluded from the computation of diluted earnings per share (in shares) 0 0 0