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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
Mar. 31, 2025
Mar. 31, 2024
Earnings    
Net income $ 630 $ 753
Less: Preferred stock dividends 5 5
Net income available to common stockholders $ 625 $ 748
Shares    
Weighted average common shares outstanding, basic 286.6 298.1
Dilutive effect of stock-based awards under compensation plans 4.2 4.5
Weighted average common shares outstanding and dilutive potential common shares 290.8 302.6
Earnings Per Share, Basic [Abstract]    
Net income available to common stockholders $ 2.18 $ 2.51
Earnings Per Share, Diluted [Abstract]    
Net income available to common stockholders $ 2.15 $ 2.47