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Divestitures and Other Transactions - Summary of Revenues and Costs from Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Costs and other deductions |  |  |  |  |
Net income of Algeria operations, after taxes | $ 80 | $ (15) |  | $ (1,335) | $ (15)
Algeria Africa Assets | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Revenues and other income |  |  |  |  |
Net sales |  | 172 | $ 319 |  | 172
Costs and other deductions |  |  |  |  |
Oil and gas lease operating expense |  | 12 | 44 |  | 12
Transportation expense |  | 4 | 14 |  | 4
Taxes other than on income |  | 46 | 48 |  | 46
Depreciation, depletion and amortization |  | 61 | 110 |  | 61
Impairment upon reclassification to held for use |  | 0 | 931 |  | 0
Other |  | 2 | 10 |  | 2
Total costs and other deductions |  | 125 | 1,157 |  | 125
Income (losses) before income taxes |  | 47 | (838) |  | 47
Income tax expense |  | (47) | (95) |  | (47)
Net income of Algeria operations, after taxes |  | $ 0 | $ (933) |  | $ 0

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