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Revenue Contract Balances (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Aug. 31, 2021 | Aug. 31, 2020 | Dec. 31, 2019
Financing Receivable, after Allowance for Credit Loss | $ 192,000,000 |  |  |  | $ 109,000,000
Financing Receivable, Allowance for Credit Loss | 11,000,000 |  |  |  |
Contract with Customer, Liability | 699,000,000 |  |  |  | 117,000,000
Contract with Customer, Liability | 699,000,000 |  |  |  | $ 117,000,000
Contract with Customer, Liability, Revenue Recognized | 12,000,000 | $ 9,000,000 |  |  |
Mong Duong Subsidiary [Member] |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | 1,300,000,000 |  |  |  |
Financing Receivable, Allowance for Credit Loss | 33,000,000 |  |  |  |
Angamos [Member] | Minera Escondida and Minera Spence [Member] |  |  |  |  |
Contract with Customer, Liability | 546,000,000 |  |  | $ 655,000,000 |
Contract with Customer, Liability | $ 546,000,000 |  |  | $ 655,000,000 |
Angamos [Member] | Minera Escondida and Minera Spence [Member] | Forecast [Member] |  |  |  |  |
Capitalized Contract Cost, Amortization |  |  | $ 55,000,000 |  |

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