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Earnings Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net income $ 1,404 $ 1,280
Dividends and undistributed earnings allocated to participating securities (22) (23)
Preferred stock dividends (57) (57)
Net income available to common stockholders $ 1,325 $ 1,200
Total weighted-average basic common shares outstanding (in shares) 383,100,000 382,200,000
Effect of dilutive securities:    
Stock options (in shares) 200,000 200,000
Other contingently issuable shares (in shares) 700,000 1,000,000.0
Total effect of dilutive securities (in shares) 900,000 1,200,000
Total weighted-average diluted common shares outstanding (in shares) 384,000,000.0 383,400,000
Basic earnings per common share:    
Net income per basic common share (in dollars per share) $ 3.46 $ 3.14
Diluted earnings per common share:    
Net income per diluted common share (in dollars per share) $ 3.45 $ 3.13
Award    
Diluted earnings per common share:    
Anti-dilutive options excluded from the computation of diluted earnings per share (in shares)   128,000
Stock options    
Diluted earnings per common share:    
Anti-dilutive options excluded from the computation of diluted earnings per share (in shares) 0 0