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Related Party Transactions - Schedule of MGT Loan Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Interest expense	$ 189	$ 167	$ 158
Cristal | MGT Loan | Related Party
Related Party Transaction [Line Items]
Interest expense	1	1	2
Loan Repayment via MGT delivered to ATTM	$ 6	$ 6	$ 6

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