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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings        
Net income $ 738 $ 547 $ 1,491 $ 1,082
Less: Preferred stock dividends 5 5 10 10
Net income available to common stockholders $ 733 $ 542 $ 1,481 $ 1,072
Shares        
Weighted average common shares outstanding, basic 295.5 309.4 296.8 311.7
Dilutive effect of stock-based awards under compensation plans 4.4 3.9 4.5 4.3
Weighted average common shares outstanding and dilutive potential common shares 299.9 313.3 301.3 316.0
Earnings Per Share, Basic [Abstract]        
Net income available to common stockholders $ 2.48 $ 1.75 $ 4.99 $ 3.44
Earnings Per Share, Diluted [Abstract]        
Net income available to common stockholders $ 2.44 $ 1.73 $ 4.92 $ 3.39