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Earnings (Loss) Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings        
Net income $ 995 $ 738 $ 1,625 $ 1,491
Less: Preferred stock dividends 5 5 10 10
Net income available to common stockholders $ 990 $ 733 $ 1,615 $ 1,481
Shares        
Weighted average common shares outstanding, basic 283.7 295.5 285.1 296.8
Dilutive effect of stock-based awards under compensation plans 4.0 4.4 4.1 4.5
Weighted average common shares outstanding and dilutive potential common shares 287.7 299.9 289.2 301.3
Earnings Per Share, Basic [Abstract]        
Net income available to common stockholders $ 3.49 $ 2.48 $ 5.66 $ 4.99
Earnings Per Share, Diluted [Abstract]        
Net income available to common stockholders $ 3.44 $ 2.44 $ 5.58 $ 4.92