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Dispositions and Other Transactions - Summary of Revenues and Costs from Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Costs and other deductions |  |  |  |
Net income of Algeria Assets, after taxes | $ (1,415) | $ 0 | $ (1,415) | $ 0
Algeria Africa Assets | Discontinued Operations, Disposed of by Sale |  |  |  |
Revenues and other income |  |  |  |
Net sales | 116 |  | 319 |
Costs and other deductions |  |  |  |
Oil and gas lease operating expense | 21 |  | 44 |
Transportation expense | 7 |  | 14 |
Taxes other than on income | 5 |  | 48 |
Depreciation, depletion and amortization | 43 |  | 110 |
Impairment upon reclassification to held for use | 931 |  | 931 |
Other | 4 |  | 10 |
Total costs and other deductions | 1,011 |  | 1,157 |
Income before income taxes | (895) |  | (838) |
Income tax expense | (38) |  | (95) |
Net income of Algeria Assets, after taxes | $ (933) |  | $ (933) |

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