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Balance Sheet and Cash Flow Supplemental Information - Schedule of Additional Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Supplemental non cash information:      
Operating activities - Chloride slag inventory purchases made from AMIC (including VAT) $ 18 $ 0  
Operating activities - MGT sales made to AMIC 2 1  
Investing activities - In-kind receipt of AMIC loan repayment 18 0  
Financing activities - Repayment of MGT loan 2 $ 1  
Capital expenditures acquired but not yet paid $ 43   $ 67