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Subsequent events (Details) - USD ($)
$ in Millions
Nov. 07, 2024
Oct. 31, 2024
Sep. 30, 2024
DOE Loan Facility | Line of Credit      
Subsequent Event [Line Items]      
Debt instrument, commitments settled by first advance     $ 92
Subsequent Event | Glencore      
Subsequent Event [Line Items]      
Disposal group, production of mixed hydroxide precipitate, percentage   100.00%  
Subsequent Event | DOE Loan Facility | Line of Credit      
Subsequent Event [Line Items]      
Amount Issued $ 475    
Line of credit facility, maximum borrowing capacity 445    
Line of credit facility, maximum capitalized interest $ 30    
Debt instrument, basis spread on variable rate 0.00%    
Debt instrument, fund reserve, required amount $ 173    
Debt instrument, fund reserve, required amount funded by letters of credit 97    
Debt instrument, requirement for the minimum unrestricted cash condition prior to completion 20    
Debt instrument, requirement for the minimum unrestricted cash condition following the completion $ 10