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Revenue Contract Balances (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Aug. 31, 2021	Dec. 31, 2020	Aug. 31, 2020
Financing Receivable, after Allowance for Credit Loss	$ 103,000,000			$ 101,000,000
Financing Receivable, Allowance for Credit Loss	8,000,000			9,000,000
Contract with Customer, Liability	376,000,000			531,000,000
Contract with Customer, Liability	376,000,000			$ 531,000,000
Contract with Customer, Liability, Revenue Recognized	183,000,000	$ 10,000,000
Mong Duong Subsidiary [Member]
Financing Receivable, after Allowance for Credit Loss	1,300,000,000
Financing Receivable, Allowance for Credit Loss	32,000,000
Mong Duong Subsidiary [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Financing Receivable, after Allowance for Credit Loss, Noncurrent	1,200,000,000
Financing Receivable, after Allowance for Credit Loss, Current	83,000,000
Angamos [Member] | Minera Escondida and Minera Spence [Member]
Contract with Customer, Liability	219,000,000				$ 655,000,000
Contract with Customer, Liability	$ 219,000,000				$ 655,000,000
Angamos [Member] | Minera Escondida and Minera Spence [Member] | Forecast [Member]
Capitalized Contract Cost, Amortization			$ 55,000,000

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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