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SEGMENT INFORMATION - Geographical Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of geographical areas [line items] |  |
Non-current assets | $ 20,624 | $ 20,390
Revenue | 8,374 | 8,558
United States |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 6,641 | 6,768
Revenue | 3,299 | 3,081
Dominican Republic |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 3,480 | 3,540
Revenue | 1,417 | 1,548
Argentina |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 2,217 | 2,366
Revenue | 591 | 685
Chile |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 2,469 | 1,945
Revenue | 0 | 0
Tanzania |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 1,129 | 1,673
Revenue | 751 | 1,045
Peru |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 734 | 678
Revenue | 676 | 663
Australia |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 463 | 478
Revenue | 456 | 472
Zambia |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 787 | 473
Revenue | 612 | 466
Papua New Guinea |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 351 | 353
Revenue | 322 | 304
Saudi Arabia |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 371 | 346
Revenue | 0 | 0
Unallocated |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 1,357 | 1,267
Revenue | 0 | 0
Canada |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 625 | 503
Revenue | $ 250 | $ 294

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