Preferred and Common Stock - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jul. 31, 2024	Jul. 31, 2022	Jun. 30, 2022	Oct. 31, 2021
Class of Stock [Line Items]
Preferred stock, authorized (in shares)	100,000,000
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, issued (in shares)		0
Common stock shares authorized	750,000,000
Common stock par value	$ 0.01
Common stock shares issued	258,360,908	178,472,464
Common stock shares outstanding	258,360,908	178,472,464
Common stock were reserved for future issuance	19,409,409
Common stock repurchase program, authorized amount							$ 500,000,000
Number of shares remained available for repurchase						$ 150,000,000
Common stock dividends declared during period	$ 89,000,000	$ 72,000,000	$ 72,000,000
Quarterly dividends paid on preferred stock per share	$ 1,000,000
Quarterly cash dividend declared per share	$ 0.1	$ 0.1	$ 0.1
Stock based compensation expense	$ 36,000,000	$ 35,000,000	$ 40,000,000
Stock based compensation expense, stock units percentage	100.00%	100.00%	100.00%
Stock-based compensation expense capitalized	$ 0	$ 0	$ 0
Stock options vested and exercisable	133,446
Weighted average exercise price, vested and exercisable	$ 27.66
Cash received from option exercises	$ 0	1,000,000	22,000,000
Total intrinsic value of options exercised			22,000,000
Number of options, Vested and expected to vest, weighted average remaining contractual life	3 years 25 days
Total intrinsic value of options vested and exercisable	$ 2,000,000
Total fair value of stock units	37,000,000	$ 35,000,000	$ 32,000,000
Unrecognized compensation costs (pretax) on non-vested stock option grants	$ 33,000,000
Unrecognized compensation costs on non-vested awards, weighted average period of recognition in years	1 year 6 months 10 days
Alumina Limited [Member]
Class of Stock [Line Items]
Common stock shares outstanding		78,772,422
Common Stock [Member]
Class of Stock [Line Items]
Shares issued for employee stock-based compensation plans	1,116,022	1,503,373	1,434,543
Stock Units [Member]
Class of Stock [Line Items]
Stock granted, Fair value	$ 31.43
Number of shares withheld to meet statutory tax requirements	472,858
Restricted Stock [Member]
Class of Stock [Line Items]
Volatility	59.40%	64.88%	65.25%
Average risk-free interest rate	4.35%	4.26%	1.71%
Stock granted, Fair value	$ 40.27	$ 71.12	$ 126.86
Series A Convertible Preferred Stock [Member] | Alumina Limited [Member]
Class of Stock [Line Items]
Preferred stock, authorized (in shares)				10,000,000
Preferred stock, par value (in dollars per share)				$ 0.01
Preferred stock, issued (in shares)	4,041,989
Preferred stock outstanding	4,041,989			4,041,989
Quarterly dividends paid on preferred stock per share	$ 1,000,000
Quarterly cash dividend declared per share	$ 0.1
New Repurchase Program [Member]
Class of Stock [Line Items]
Common stock repurchase program, authorized amount					$ 500,000,000
New Repurchase Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Common stock repurchase program, authorized amount	$ 500,000,000
Repurchase of common stock shares	0	0	8,565,200
Repurchase of common stock value			$ 500,000,000
Stock Options [Member]
Class of Stock [Line Items]
Number of options, Outstanding	133,446	148,608