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Balance Sheet and Cash Flow Supplemental Information - Schedule of Additional Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Supplemental non cash information: |  |  |
Operating activities - Chloride slag inventory purchases made from AMIC (including VAT) | $ 0 | $ 11 |
Operating activities - MGT sales made to AMIC | 3 | 3 |
Investing activities - In-kind receipt of AMIC loan repayment | 0 | 11 |
Financing activities - Initial commercial insurance premium financing agreement | 0 | 1 |
Financing activities - Repayment of MGT loan | 3 | $ 3 |
Capital expenditures acquired but not yet paid | $ 39 |  | $ 44

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