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BUSINESS SEGMENTS INFORMATION (Customers and Labor Matters) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Major Customer and Labor Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Disclosure of Major Customers |  |  |  |  |  |  |  |  | 0 |  |
Revenues | $ 4,377 | $ 3,877 | $ 3,334 | $ 3,242 | $ 3,516 | $ 3,382 | $ 3,938 | $ 3,771 | $ 14,830 | $ 14,607 | $ 20,001
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Major Customer and Labor Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  | 50.00% |  |
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year | Labor Force Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Major Customer and Labor Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  | 33.00% |  |
Affiliated Entity | Noncontrolling Interest Owners Of South America Mining Operations |  |  |  |  |  |  |  |  |  |  |
Major Customer and Labor Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,000 |  | 1,600
Affiliated Entity | PT Smelting |  |  |  |  |  |  |  |  |  |  |
Major Customer and Labor Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,400 | 1,100 | 1,800
Phillips 66 |  |  |  |  |  |  |  |  |  |  |
Major Customer and Labor Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 2,500
Phillips 66 | Revenue | Customer Concentration |  |  |  |  |  |  |  |  |  |  |
Major Customer and Labor Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  |  |  | 12.00%
Indonesia |  |  |  |  |  |  |  |  |  |  |
Major Customer and Labor Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,402 | $ 1,054 | $ 1,792
Indonesia | PT Smelting |  |  |  |  |  |  |  |  |  |  |
Major Customer and Labor Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Percent of Net Assets | 25.00% |  |  |  |  |  |  |  | 25.00% |  |

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