Earnings Per Common Share - Computations of Basic Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income available to common shareholders:
Net Income (Loss)	$ 689,941	$ 646,596	$ 2,258,599	$ 1,226,292
Less: Preferred stock dividends	(24,941)	(24,941)	(74,822)	(71,647)
Net income available to common equity	665,000	621,655	2,183,777	1,154,645
Less: Income attributable to unvested stock-based compensation awards	(1,237)	(1,106)	(3,975)	(2,245)
Net income available to common shareholders	$ 663,763	$ 620,549	$ 2,179,802	$ 1,152,400
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	166,217	174,921	166,787	160,793
Less: Unvested stock-based compensation awards	(308)	(312)	(299)	(319)
Weighted-average shares outstanding	165,909	174,609	166,488	160,474
Basic earnings per common share	$ 4	$ 3.55	$ 13.09	$ 7.18