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Acquisitions and Divestitures (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2022 USD ($) MMBoe | Mar. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) MMBoe $ / MMBTU $ / bbl | Dec. 31, 2022 USD ($) MMBoe | Dec. 31, 2021 MMBoe
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |
Common Stock Shares Issued |  |  |  |  | $ 64 | $ 65 |
Total estimated proved reserves | MMBoe |  |  |  |  | 1 | 3 | 7
Potential additional contingent earnout payment |  |  |  |  | $ 65 |  |
Barnett Shale [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |
Contingent earnout payments |  | $ 65 |  | $ 65 |  |  |
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU |  |  |  |  | 2.75 |  |
WTI oil price for contingent earnout payment upside | $ / bbl |  |  |  |  | 50 |  |
Barnett Shale [Member] | Subsequent Event |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |
Additional contingent earnout payment | $ 20 |  |  |  |  |  |
Other Current Assets |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |
Contingent earnout payments |  |  |  |  | $ 20 |  |
Other Noncurrent Assets |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |
Contingent earnout payments |  |  |  |  | 35 |  |
Non Core Assets |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |
Contingent earnout payments |  | $ 4 |  | $ 4 |  |  |
Proceeds from sale of business |  |  |  |  | 9 |  |
Gain related to sale of assets |  |  |  |  | $ 35 |  |
Devon and WPX Agreement [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |
Date of agreement |  |  |  |  | Jan. 07, 2021 |  |
Conversion of common stock into right to received per share |  |  |  |  | 0.00005165 |  |
Common Stock Shares Issued |  |  |  |  | $ 5,400 |  |
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 |  |  |  |
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 [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |  |  |  |
Total estimated proved reserves | MMBoe |  |  | 66 |  |  |  |

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