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Lawsuits, Claims, Commitments and Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2020
Lawsuits, commitments and contingencies |  |  |  |  |  |  |
Tentative cash tax refund |  |  | $ 96 | $ 2 |  |  |
Anticipated cash refund |  |  | 170 |  |  |  |
Forecast |  |  |  |  |  |  |
Lawsuits, commitments and contingencies |  |  |  |  |  |  |
Anticipated cash refund |  |  |  |  |  |  | $ 25
Anadarko |  |  |  |  |  |  |
Lawsuits, commitments and contingencies |  |  |  |  |  |  |
Tentative cash tax refund | $ 881 |  | $ 881 |  |  |  |
Arbitration filed by Andes Petroleum Ecuador Ltd |  |  |  |  |  |  |
Lawsuits, commitments and contingencies |  |  |  |  |  |  |
Proceeds from settlement |  |  |  |  |  | $ 1,000 |
Recovery of amount awarded in settlement amount (as a percent) |  |  |  |  |  | 60.00% |
Percentage of judgment amount claimed |  |  |  |  | 40.00% |  |
Own economic interest (as a percent) |  |  |  |  | 60.00% |  |
Tronox Settlement |  |  |  |  |  |  |
Lawsuits, commitments and contingencies |  |  |  |  |  |  |
Payments for settlement |  | $ 5,200 |  |  |  |  |

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