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BUSINESS SEGMENTS INFORMATION (Product Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 3,684 | $ 4,908 | $ 5,168 | $ 4,868 | $ 5,041 | $ 4,310 | $ 3,711 | $ 3,341 | $ 18,628 | $ 16,403 | $ 14,830
Treatment and refining charges included in copper concentrates revenues |  |  |  |  |  |  |  |  | (535) | (536) | (652)
Royalty Expense |  |  |  |  |  |  |  |  | (246) | (181) | (138)
Export Duties Expense |  |  |  |  |  |  |  |  | (180) | (115) | (95)
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  | 18,945 | 15,888 | 14,564
Copper in concentrate |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 6,180 | 5,604 | 5,048
Rod, and other refined copper products |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 2,396 | 2,387 | 2,082
Purchased Copper [Member] |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 1,053 | 789 | 428
Copper Cathode |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 4,366 | 3,759 | 3,495
Gold |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 3,231 | 2,126 | 1,592
Molybdenum |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 1,190 | 896 | 659
Other |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 1,490 | 1,159 | 2,145
Derivatives Not Designated as Hedging Instruments | Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  |  |  |  |  |  |  |  | $ (317) | $ 515 | $ 266

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