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Discontinued Operations (Narrative) (Details) - BKV [Member] - Barnett Shale [Member] $ in Millions |  | 9 Months Ended | 48 Months Ended
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Oct. 01, 2020 USD ($) $ / MMBTU $ / bbl | Sep. 30, 2021 | Dec. 31, 2024 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Proceeds from the sale of business | $ 490 |  |
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. |
Scenario Forecast [Member] | Maximum [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Contingent earnout payments |  |  | $ 260

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