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Related Parties - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Dec. 31, 2025	Feb. 21, 2024	Dec. 17, 2020	Dec. 29, 2019	May 09, 2018
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares)	159,700,029	158,557,858
Other long-term assets	$ 116	$ 117
Related party payables
Related Party Transaction [Line Items]
Ownership by related party (in percent)			35.00%
Related party payables \| Slagger
Related Party Transaction [Line Items]
Ownership by related party (in percent)			65.00%
Advanced Metal Industries Cluster Company Limited \| Option Agreement, Option To Acquire Special Purchase Vehicle \| Related party payables
Related Party Transaction [Line Items]
Ownership by related party (in percent)						90.00%
Advanced Metal Industries Cluster Company Limited \| Acquisition Of Assets Producing Metal Grade TiCl4 \| Related party payables
Related Party Transaction [Line Items]
Other long-term assets					$ 36
Slagger \| Advanced Metal Industries Cluster and Toho Titanium Metal Co. Ltd (ATTM)
Related Party Transaction [Line Items]
Loan commitment						$ 322
AMIC \| Option Agreement, Amounts to be Reimbursed for Capital Expenditures and Operational Expenses \| Related party payables
Related Party Transaction [Line Items]
Amounts receivable from related party						$ 125
Cristal \| Related party payables \| MGT Loan
Related Party Transaction [Line Items]
Total outstanding note payable	$ 10	$ 13		$ 36
Cristal \| Related party payables \| MGT Loan \| Minimum
Related Party Transaction [Line Items]
Debt instrument, term (in years)	1 year
Cristal \| Related party payables \| MGT Loan \| Maximum
Related Party Transaction [Line Items]
Debt instrument, term (in years)	2 years
Cristal's Titanium Dioxide Business
Related Party Transaction [Line Items]
Ownership (in percent)	24.00%
Acquisition Of Assets Producing Metal Grade TiCl4 \| Related party payables \| Advanced Metal Industries Cluster and Toho Titanium Metal Co. Ltd (ATTM)
Related Party Transaction [Line Items]
Ownership (in percent)					65.00%
Cristal's Titanium Dioxide Business
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares)	37,580,000