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, 2023	Mar. 31, 2022
Earnings
Net income	$ 535	$ 443
Less: Preferred stock dividends	5	5
Net income available to common stockholders	$ 530	$ 438
Shares
Weighted average common shares outstanding, basic	314.0	332.3
Dilutive effect of stock-based awards under compensation plans	4.6	5.0
Weighted average common shares outstanding and dilutive potential common shares	318.6	337.3
Earnings Per Share, Basic [Abstract]
Net income available to common stockholders	$ 1.69	$ 1.32
Earnings Per Share, Diluted [Abstract]
Net income available to common stockholders	$ 1.66	$ 1.30