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Acquisition and Divestitures (Narrative) (Details) $ in Millions		3 Months Ended		9 Months Ended		48 Months Ended
	Jan. 07, 2021	Mar. 31, 2021 USD ($) MMBoe	Dec. 31, 2020 USD ($) $ / MMBTU $ / bbl	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2024
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]
Conversion of common stock into right to recieve per share	0.5165			0.5165
Common Stock Shares Issued			$ 38	$ 68
Gain on asset dispositions					$ 2
Gain loss on disposition of assets				119
BKV [Member] | Barnett Shale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]
Divestitures of property and equipment			490
Contingent earnout payments			$ 260
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU			2.75
WTI oil price for contingent earnout payment upside | $ / bbl			50
Gain loss on disposition of assets				65
BKV [Member] | 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				46
BKV [Member] | 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				$ 85
BKV [Member] | Barnett Shale [Member] | Scenario Forecast [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]
Contingent earnout payment period						The contingent payment period commenced on January 1, 2021 and has a term of four years.
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		$ 8
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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