Revenue Contract Balances (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Aug. 31, 2021	Dec. 31, 2021	Aug. 31, 2020
Financing Receivable, after Allowance for Credit Loss	$ 53,000,000			$ 57,000,000
Financing Receivable, Allowance for Credit Loss	1,000,000			1,000,000
Contract with Customer, Liability	235,000,000			216,000,000
Contract with Customer, Liability	235,000,000			216,000,000
Contract with Customer, Liability, Revenue Recognized	30,000,000	$ 183,000,000
Mong Duong Subsidiary [Member]
Financing Receivable, after Allowance for Credit Loss	1,200,000,000
Financing Receivable, Allowance for Credit Loss	30,000,000
Mong Duong Subsidiary [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Financing Receivable, after Allowance for Credit Loss, Noncurrent	1,100,000,000
Financing Receivable, after Allowance for Credit Loss, Current	$ 93,000,000			$ 91,000,000
Angamos [Member] | Minera Escondida and Minera Spence [Member]
Contract with Customer, Liability					$ 655,000,000
Capitalized Contract Cost, Amortization			$ 55,000,000
Contract with Customer, Liability					$ 655,000,000