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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 |

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