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SEGMENT INFORMATION - Geographical Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of geographical areas [line items] |  |
Non-current assets | $ 37,505 | $ 18,653
Revenue | 9,717 | 7,243
United States |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 16,514 | 6,857
Revenue | 4,190 | 3,025
MALI |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 4,662 | 0
Revenue | 1,007 | 0
Dominican Republic |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 4,303 | 3,468
Revenue | 1,409 | 1,334
CONGO, THE DEMOCRATIC REPUBLIC OF THE |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 3,218 | 0
Revenue | 0 | 0
Argentina |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 2,158 | 2,679
Revenue | 0 | 0
Zambia |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 1,705 | 735
Revenue | 393 | 502
Zambia |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 1,571 | 1,723
Revenue | 386 | 366
Tanzania |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 1,009 | 1,059
Revenue | 671 | 664
Canada |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 490 | 368
Revenue | 305 | 226
COTE D'IVOIRE |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 424 | 0
Revenue | 384 | 0
Saudi Arabia |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 368 | 408
Revenue | 0 | 0
Papua New Guinea |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 361 | 348
Revenue | 403 | 269
Canada |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 170 | 145
Revenue | 279 | 449
Saudi Arabia |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 0 | 396
Revenue | 290 | 408
Unallocated |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 552 | 467
Revenue | $ 0 | $ 0

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