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Acquisition and Divestitures (Narrative) (Details) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 07, 2021 | Mar. 31, 2022 USD ($) $ / bbl $ / MMBTU | Mar. 31, 2021 USD ($) MMBoe | Dec. 31, 2021 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |
Common Stock Shares Issued |  | $ 66 |  | $ 66
Gain loss on disposition of assets |  | 1 | $ 32 |
Barnett Shale [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |
Contingent earnout payments |  | $ 65 |  |
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. |  |
Barnett Shale [Member] | Other Current Assets [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |
Contingent earnout payments |  | $ 51 |  |
Barnett Shale [Member] | Other Noncurrent Assets [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |
Contingent earnout payments |  | 60 |  |
Non Core Assets [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items] |  |  |  |
Divestitures of property and equipment |  |  | 9 |
Gain on asset dispositions |  |  | $ 35 |
Contingent earnout payments |  | 4 |  |
Change in contingent earnout payments |  | $ 4 |  |
Total estimated proved reserves | MMBoe |  |  | 3 |
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 | Jan. 07, 2021 |  |
Conversion of common stock into right to recieve per share | 0.5165 |  |  |
Common Stock Shares Issued |  | $ 5,400 |  |

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