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Acquisition and Divestitures (Narrative) (Details) $ in Millions		3 Months Ended				6 Months Ended		48 Months Ended
	Jan. 07, 2021	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($) MMBoe	Dec. 31, 2020 USD ($) $ / MMBTU $ / bbl	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 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		$ 68		$ 38		$ 68
Gain on asset dispositions					$ 2		$ 2
Gain loss on disposition of assets		87				$ 119
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
Conversion of common stock into right to recieve per share	0.5165
Common Stock Shares Issued		5,400				$ 5,400
Barnett Shale [Member] | BKV [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
Barnett Shale [Member] | BKV [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
Barnett Shale [Member] | BKV [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
Barnett Shale [Member] | BKV [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.

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