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Acquisition and Divestitures (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 USD ($) MMBoe | Jul. 31, 2022 USD ($) MMBoe | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) $ / MMBTU $ / bbl
Eagle Ford [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |
Total estimated proved reserves | MMBoe | 87 |  |  |  |
Williston Basin |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |
Total estimated proved reserves | MMBoe |  | 66 |  |  |
Other Current Assets [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |
Contingent earnout payments |  |  |  |  | $ 20
Other Noncurrent Assets [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |
Contingent earnout payments |  |  |  |  | 45
Barnett Shale [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |
Contingent earnout payments |  |  |  |  | 65
Additional contingent earnout payment |  |  |  |  | $ 130
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU |  |  |  |  | 2.75
WTI oil price for contingent earnout payment upside | $ / bbl |  |  |  |  | 50
Contingent earnout payment period |  |  |  |  | The contingent payment period commenced on January 1, 2021 and has a term of four years.
Eagle Ford Acquisition [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |
Cash consideration | $ 1,700 |  |  |  |
Williston Acquisition [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |
Cash consideration |  | $ 830 |  |  |
Non Core Assets [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |
Contingent earnout payments |  |  | $ 4 | $ 4 |

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