Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Commitments And Contingencies [Line Items]
Purchase commitments for property, plant and equipment	$ 320
Asset retirement obligation depreciation and accretion	28	$ 17	$ 16
Liability reserve for insurance claims	53	47
Outstanding letters of credit	37
Capital expenditures	$ 139	111	$ 90
Percentage of employees represented in labor union	13.00%
Woodville
Commitments And Contingencies [Line Items]
Collective bargaining agreement expiration month year	2026-06
Magnesia Specialties
Commitments And Contingencies [Line Items]
Collective bargaining agreement expiration month year	2027-08
Surety Bonds
Commitments And Contingencies [Line Items]
Surety bonds	$ 818
Revolving Facility
Commitments And Contingencies [Line Items]
Outstanding letters of credit	3	$ 3
Capital Addition Purchase Commitments
Commitments And Contingencies [Line Items]
Purchase commitments for property, plant and equipment	162
Energy And Service Contracts
Commitments And Contingencies [Line Items]
Purchase commitments for property, plant and equipment	$ 158