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Balance Sheet and Cash Flows Supplemental Information - Schedule of Cash Flow, Supplemental Disclosures (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed Balance Sheet Statements, Captions [Line Items]      
Operating activities - Chloride slag inventory purchases made from AMIC (including VAT) $ 11 $ 67 $ 51
Operating activities - MGT sales made to AMIC 6 6 6
Operating activities - Interest expense on MGT loan 1 1 2
Operating activities - Withholding tax on sale of royalty interest 0 7 0
Investing activities - In-kind receipt of AMIC loan repayment 11 67 51
Investing activities - Proceeds from sale of royalty interest 0 7 0
Financing activities - Repayment of MGT loan 6 6 6
Financing activities - Initial commercial insurance premium financing agreement 21 18 18
Capital expenditures acquired but not yet paid $ 44 91 $ 67
Canada      
Condensed Balance Sheet Statements, Captions [Line Items]      
Investing activities - Proceeds from sale of royalty interest   $ 28