Earnings Per Share - Summary of Computation Earnings Per Common Share Using Two Class Method (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 48	$ 26	$ 30	$ (7)	$ 74	$ 23
Less stock dividend attributable to Series B Preferred Stock	(11)		(11)		(22)	(22)
Net income attributable to common shareholders	$ 28		$ 15		$ 40	$ 1
Weighted average shares outstanding - basic	235,182,839		233,104,873		234,784,799	232,670,986
Income per common share - basic	$ 0.12		$ 0.06		$ 0.17	$ 0.01
Diluted earnings per common share:
Net Income (Loss)	$ 48	$ 26	$ 30	$ (7)	$ 74	$ 23
Less stock dividend attributable to Series B Preferred Stock	(11)		(11)		(22)	(22)
Net income attributable to common shareholders - diluted	$ 32		$ 17		$ 46	$ 1
Weighted average shares outstanding - basic	235,182,839		233,104,873		234,784,799	232,670,986
Dilutive securities:
Restricted stock units, warrants, and stock options	240,255		297,797		252,885	367,863
Shares issuable upon conversion of Series B Preferred Shares	32,520,000		32,520,000		32,520,000	32,520,000
Shares issuable pursuant to the Series A Preferred Stock dividend	1,618,596				809,298
Weighted average shares outstanding - diluted	269,561,690		265,922,670		268,366,982	265,558,849
Income per common share - diluted	$ 0.12		$ 0.06		$ 0.17	$ 0.01
Series A Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less income allocable to Preferred Stock	$ (4)		$ (2)		$ (6)
Diluted earnings per common share:
Less income allocable to Series A Preferred Stock	(5)		(2)		(6)
Series B Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less income allocable to Preferred Stock	$ (5)		$ (2)		$ (6)