Earnings Per Common Share - Computations of Basic Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income available to common shareholders:
Net Income (Loss)	$ 867,034	$ 217,522	$ 1,568,658	$ 579,696
Less: Preferred stock dividends	(24,940)	(24,941)	(49,881)	(46,706)
Net income available to common equity	842,094	192,581	1,518,777
Less: Income attributable to unvested stock-based compensation awards	(1,574)	(345)	(2,731)	(1,076)
Net income available to common shareholders	$ 840,520	$ 192,236	$ 1,516,046	$ 531,914
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	166,152	177,682	167,076	153,612
Less: Unvested stock-based compensation awards	(310)	(315)	(294)	(322)
Weighted-average shares outstanding	165,842	177,367	166,782	153,290
Basic earnings per common share	$ 5.07	$ 1.08	$ 9.09	$ 3.47