Acquisition and Divestitures (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) $ / MMBTU $ / bbl	Mar. 31, 2023 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]
Potential additional contingent earnout payment	$ 65
Other Current Assets [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]
Contingent earnout payments	35
Barnett Shale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]
Contingent earnout payments	$ 20	$ 65
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.
Non Core Assets [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations And Disposition [Line Items]
Contingent earnout payments		$ 4