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DIVESTITURES AND OTHER TRANSACTIONS - SUMMARY OF REVENUES AND COSTS FROM DISCONTINUED OPERATIONS (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Costs and other deductions |  |  |  |
Discontinued operations, net of tax |  | $ (1,298) | $ (15) | $ 0
Algeria Africa Assets | Reclassifications |  |  |  |
Revenues and other income |  |  |  |
Net sales |  |  | 518 |
Costs and other deductions |  |  |  |
Oil and gas lease operating expense |  |  | 36 |
Transportation expense |  |  | 14 |
Taxes other than on income |  |  | 133 |
Depreciation, depletion and amortization |  |  | 159 |
Other |  |  | 9 |
Total costs and other deductions |  |  | 351 |
Income (loss) before income taxes |  |  | 167 |
Income tax benefit (expense) |  |  | (167) |
Discontinued operations, net of tax |  |  | $ 0 |
Anadarko's Africa Assets | Disposed of by sale |  |  |  |
Revenues and other income |  |  |  |
Net sales | $ 221 | 419 |  |
Costs and other deductions |  |  |  |
Oil and gas lease operating expense | 45 | 117 |  |
Fair value adjustment on assets held for sale | 85 | 2,263 |  |
Other | 45 | 48 |  |
Total costs and other deductions | 175 | 2,428 |  |
Income (loss) before income taxes | 46 | (2,009) |  |
Income tax benefit (expense) | (61) | 711 |  |
Discontinued operations, net of tax | $ (15) | $ (1,298) |  |

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