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Lawsuits, Claims, Commitments and Contingencies (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 26, 2021 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2021
Lawsuits, commitments and contingencies |  |  |  |  |
Potential cash tax |  |  |  |  | $ 935
Federal |  |  |  |  |
Lawsuits, commitments and contingencies |  |  |  |  |
Potential cash tax |  |  |  |  | 908
State |  |  |  |  |
Lawsuits, commitments and contingencies |  |  |  |  |
Potential cash tax |  |  |  |  | 27
Anadarko |  |  |  |  |
Lawsuits, commitments and contingencies |  |  |  |  |
Tentative cash tax refund |  |  | $ 881 |  |
Potential accrued interest |  |  |  |  | $ 284
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% | 40.00% |  |  |
Own economic interest (as a percent) |  | 60.00% |  |  |
Amount awarded to other party in litigation | $ 391 |  |  |  |
Tronox Settlement |  |  |  |  |
Lawsuits, commitments and contingencies |  |  |  |  |
Payments for settlement |  |  |  | $ 5,200 |

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