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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings        
Net income $ 482 $ 459 $ 1,636 $ 1,200
Less: Preferred stock dividends 6 6 16 16
Net income available to common stockholders $ 476 $ 453 $ 1,620 $ 1,184
Shares        
Weighted average common shares outstanding, basic 345.6 358.3 352.5 358.3
Dilutive effect of stock-based awards under compensation plans 5.1 2.2 4.7 2.0
Weighted average common shares outstanding and dilutive potential common shares 350.7 360.5 357.2 360.3
Earnings Per Share, Basic [Abstract]        
Net income available to common stockholders $ 1.38 $ 1.26 $ 4.60 $ 3.30
Earnings Per Share, Diluted [Abstract]        
Net income available to common stockholders $ 1.36 $ 1.26 $ 4.54 $ 3.29