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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Measurements [Abstract] |
Disclosure of fair value measurement of assets | A) Assets and Liabilities Measured at Fair Value on a Recurring Basis
As at June 30, 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 |  | $2,153 |  |  | $— |  |  | $— |  |  | $2,153 |
Other investments | 221 |  | — |  | — |  | 221 |
Derivatives | — |  | 2 |  | — |  | 2 |
Receivables from provisional copper and gold sales | — |  | 45 |  | — |  | 45 |
|  | $2,374 |  |  | $47 |  |  | $— |  |  | $2,421 |
B) Fair Values of Financial Assets and Liabilities
| As at June 30, 2019 |  | As at December 31, 2018 |
| Carrying amount |  | Estimated fair value |  | Carrying amount |  | Estimated fair value |
Financial assets |  |  |  |
Other assets 1 |  | $524 |  |  | $524 |  |  | $559 |  |  | $559 |
Other investments 2 | 221 |  | 221 |  | 209 |  | 209 |
Derivative assets | 2 |  | 2 |  | 3 |  | 3 |
|  | $747 |  |  | $747 |  |  | $771 |  |  | $771 |
Financial liabilities |  |  |  |
Debt 3 |  | $5,807 |  |  | $6,925 |  |  | $5,738 |  |  | $6,183 |
Derivative liabilities | — |  | — |  | 3 |  | 3 |
Other liabilities | 519 |  | 519 |  | 297 |  | 297 |
|  | $6,326 |  |  | $7,444 |  |  | $6,038 |  |  | $6,483 |
1 | Includes restricted cash and amounts due from our partners.
2 | Recorded at fair value. Quoted market prices are used to determine fair value.
3 | Debt is generally recorded at amortized cost. The fair value of debt is primarily determined using quoted market prices. Balance includes both current and long-term portions of debt.
We do not offset financial assets with financial liabilities.
Disclosure of fair value measurement of liabilities [text block] | A) Assets and Liabilities Measured at Fair Value on a Recurring Basis
As at June 30, 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 |  | $2,153 |  |  | $— |  |  | $— |  |  | $2,153 |
Other investments | 221 |  | — |  | — |  | 221 |
Derivatives | — |  | 2 |  | — |  | 2 |
Receivables from provisional copper and gold sales | — |  | 45 |  | — |  | 45 |
|  | $2,374 |  |  | $47 |  |  | $— |  |  | $2,421 |
B) Fair Values of Financial Assets and Liabilities
| As at June 30, 2019 |  | As at December 31, 2018 |
| Carrying amount |  | Estimated fair value |  | Carrying amount |  | Estimated fair value |
Financial assets |  |  |  |
Other assets 1 |  | $524 |  |  | $524 |  |  | $559 |  |  | $559 |
Other investments 2 | 221 |  | 221 |  | 209 |  | 209 |
Derivative assets | 2 |  | 2 |  | 3 |  | 3 |
|  | $747 |  |  | $747 |  |  | $771 |  |  | $771 |
Financial liabilities |  |  |  |
Debt 3 |  | $5,807 |  |  | $6,925 |  |  | $5,738 |  |  | $6,183 |
Derivative liabilities | — |  | — |  | 3 |  | 3 |
Other liabilities | 519 |  | 519 |  | 297 |  | 297 |
|  | $6,326 |  |  | $7,444 |  |  | $6,038 |  |  | $6,483 |
1 | Includes restricted cash and amounts due from our partners.
2 | Recorded at fair value. Quoted market prices are used to determine fair value.
3 | Debt is generally recorded at amortized cost. 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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