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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

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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