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ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS - SUMMARY OF REVENUE AND COSTS FROM DISCONTINUED OPERATIONS (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Costs and other deductions |  |  |  |
Discontinued operations, net of tax |  | $ (15) | $ 0 | $ 0
Anadarko's Africa Assets | Disposed of by sale |  |  |  |
Revenues and other income |  |  |  |
Net sales | $ 739 |  |  |
Costs and other deductions |  |  |  |
Oil and gas lease operating expense | 81 |  |  |
Transportation expense | 14 |  |  |
Taxes other than on income | 133 |  |  |
Fair value adjustment on assets held for sale | 244 |  |  |
Other | 53 |  |  |
Total costs and other deductions | 525 |  |  |
Income before income taxes | 214 |  |  |
Income tax expense | (229) |  |  |
Discontinued operations, net of tax | $ (15) |  |  |

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