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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Measurements [Abstract] |
Disclosure of fair value measurement of liabilities |
Fair Value Measurements |  |  |  |  |
At December 31, 2020 | Quoted Prices in Active Markets for Identical Assets | Significant Other Observable Inputs | Significant Unobservable Inputs | Aggregate Fair Value |
(Level 1) | (Level 2) | (Level 3) |
Cash and equivalents | $5,188 |  | $— |  | $— |  | $5,188 |  |
Other investments 1 | 428 |  | — |  | — |  | 428 |  |
Derivatives | — |  | 40 |  | — |  | 40 |  |
Receivables from provisional copper and gold sales | — |  | 265 |  | — |  | 265 |  |
| $5,616 |  | $305 |  | $— |  | $5,921 |  |
Fair Value Measurements |  |  |  |  |
At December 31, 2019 | Quoted Prices in Active Markets for Identical Assets | Significant Other Observable Inputs | Significant Unobservable Inputs | Aggregate Fair Value |
(Level 1) | (Level 2) | (Level 3) |
Cash and equivalents | $3,314 |  | $— |  | $— |  | $3,314 |  |
Other investments 1 | 258 |  | — |  | — |  | 258 |  |
Derivatives | — |  | 1 |  | — |  | 1 |  |
Receivables from provisional copper and gold sales | — |  | 68 |  | — |  | 68 |  |
| $3,572 |  | $69 |  | $— |  | $3,641 |  |
1 Includes equity investments in other mining companies.
| At December 31, 2020 | At December 31, 2019
| Carrying amount | Estimated fair value | Carrying amount | Estimated fair value
Financial assets |  |  |  |
Other assets 1 | $571 |  | $571 |  | $612 |  | $612 |
Other investments 2 | 428 |  | 428 |  | 258 |  | 258 |
Derivative assets 3 | 40 |  | 40 |  | 1 |  | 1 |
| $1,039 |  | $1,039 |  | $871 |  | $871 |
Financial liabilities |  |  |  |
Debt 4 | $5,155 |  | $7,288 |  | $5,536 |  | $6,854 |
Other liabilities | 382 |  | 382 |  | 209 |  | 209 |
| $5,537 |  | $7,670 |  | $5,745 |  | $7,063 |
1 Includes restricted cash and amounts due from our partners. 2 Includes equity investments in other mining companies. Recorded at fair value. Quoted market prices are used to determine fair value. 3 Primarily consists of contingency consideration received as part of the sale of Massawa. 4 Debt is generally recorded at amortized cost except for obligations that are designated in a fair-value hedge relationship, in which case the carrying amount is adjusted for changes in fair value of the hedging instrument in periods when a hedge relationship exists. The fair value of debt is primarily determined using quoted market prices. Balance includes both current and long-term portions of debt.
Disclosure of fair value measurement of assets |
Fair Value Measurements |  |  |  |  |
At December 31, 2020 | Quoted Prices in Active Markets for Identical Assets | Significant Other Observable Inputs | Significant Unobservable Inputs | Aggregate Fair Value |
(Level 1) | (Level 2) | (Level 3) |
Cash and equivalents | $5,188 |  | $— |  | $— |  | $5,188 |  |
Other investments 1 | 428 |  | — |  | — |  | 428 |  |
Derivatives | — |  | 40 |  | — |  | 40 |  |
Receivables from provisional copper and gold sales | — |  | 265 |  | — |  | 265 |  |
| $5,616 |  | $305 |  | $— |  | $5,921 |  |
Fair Value Measurements |  |  |  |  |
At December 31, 2019 | Quoted Prices in Active Markets for Identical Assets | Significant Other Observable Inputs | Significant Unobservable Inputs | Aggregate Fair Value |
(Level 1) | (Level 2) | (Level 3) |
Cash and equivalents | $3,314 |  | $— |  | $— |  | $3,314 |  |
Other investments 1 | 258 |  | — |  | — |  | 258 |  |
Derivatives | — |  | 1 |  | — |  | 1 |  |
Receivables from provisional copper and gold sales | — |  | 68 |  | — |  | 68 |  |
| $3,572 |  | $69 |  | $— |  | $3,641 |  |
1 Includes equity investments in other mining companies.
| At December 31, 2020 | At December 31, 2019
| Carrying amount | Estimated fair value | Carrying amount | Estimated fair value
Financial assets |  |  |  |
Other assets 1 | $571 |  | $571 |  | $612 |  | $612 |
Other investments 2 | 428 |  | 428 |  | 258 |  | 258 |
Derivative assets 3 | 40 |  | 40 |  | 1 |  | 1 |
| $1,039 |  | $1,039 |  | $871 |  | $871 |
Financial liabilities |  |  |  |
Debt 4 | $5,155 |  | $7,288 |  | $5,536 |  | $6,854 |
Other liabilities | 382 |  | 382 |  | 209 |  | 209 |
| $5,537 |  | $7,670 |  | $5,745 |  | $7,063 |
1 Includes restricted cash and amounts due from our partners. 2 Includes equity investments in other mining companies. Recorded at fair value. Quoted market prices are used to determine fair value. 3 Primarily consists of contingency consideration received as part of the sale of Massawa. 4 Debt is generally recorded at amortized cost except for obligations that are designated in a fair-value hedge relationship, in which case the carrying amount is adjusted for changes in fair value of the hedging instrument in periods when a hedge relationship exists. The fair value of debt is primarily determined using quoted market prices. Balance includes both current and long-term portions of debt.

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