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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings        
Net income $ 905 $ 468 $ 1,154 $ 741
Less: Preferred stock dividends 5 5 10 10
Net income available to common stockholders $ 900 $ 463 $ 1,144 $ 731
Shares        
Weighted average common shares outstanding, basic 353.7 358.1 356.0 358.3
Dilutive effect of stock-based awards under compensation plans 4.8 1.2 4.4 1.9
Weighted average common shares outstanding and dilutive potential common shares 358.5 359.3 360.4 360.2
Earnings Per Share, Basic [Abstract]        
Net income available to common stockholders $ 2.54 $ 1.29 $ 3.21 $ 2.04
Earnings Per Share, Diluted [Abstract]        
Net income available to common stockholders $ 2.51 $ 1.29 $ 3.17 $ 2.03