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Discontinued Operations (Narrative) (Details) - BKV [Member] - Barnett Shale [Member] $ in Millions		6 Months Ended	48 Months Ended
	Oct. 01, 2020 USD ($) $ / MMBTU $ / bbl	Jun. 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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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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