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, 2024	Mar. 31, 2023
Earnings
Net income	$ 753	$ 535
Less: Preferred stock dividends	5	5
Net income available to common stockholders	$ 748	$ 530
Shares
Weighted average common shares outstanding, basic	298.1	314.0
Dilutive effect of stock-based awards under compensation plans	4.5	4.6
Weighted average common shares outstanding and dilutive potential common shares	302.6	318.6
Earnings Per Share, Basic [Abstract]
Net income available to common stockholders	$ 2.51	$ 1.69
Earnings Per Share, Diluted [Abstract]
Net income available to common stockholders	$ 2.47	$ 1.66