Acquisition and Divestitures (Narrative) (Details) $ in Millions		1 Months Ended	3 Months Ended			6 Months Ended
	Jan. 07, 2021	Jul. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2022 USD ($) MMBoe $ / MMBTU $ / bbl	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	$ 66
Other Current Assets [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]
Cash paid related to acquisition			87
Barnett Shale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]
Contingent earnout payments						65
Additional contingent earnout payment						$ 195
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						$ 65
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
Producing properties and leasehold interests | Subsequent Event [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]
Cash consideration		$ 830
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			$ 5,400