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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings        
Net income $ 1,080 $ 767 $ 2,705 $ 2,258
Less: Preferred stock dividends 6 6 16 16
Net income available to common stockholders $ 1,074 $ 761 $ 2,689 $ 2,242
Shares        
Weighted average common shares outstanding, basic 280.9 292.6 283.7 295.4
Dilutive effect of stock-based awards under compensation plans 4.1 4.9 4.1 4.6
Weighted average common shares outstanding and dilutive potential common shares 285.0 297.5 287.8 300.0
Earnings Per Share, Basic [Abstract]        
Net income available to common stockholders $ 3.82 $ 2.60 $ 9.48 $ 7.59
Earnings Per Share, Diluted [Abstract]        
Net income available to common stockholders $ 3.77 $ 2.56 $ 9.34 $ 7.47