Revenue Recognition (Disaggregation of Revenue on Geographic Basis) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 6,522	$ 15,002	$ 6,667
Operating Segments
Disaggregation of Revenue [Line Items]
Total operating revenues	6,522
Exploration and Production
Disaggregation of Revenue [Line Items]
Total operating revenues	4,167	10,583	4,701
Exploration and Production | Operating Segments
Disaggregation of Revenue [Line Items]
Total operating revenues	4,109	10,577	4,640
Appalachia | Exploration and Production | Operating Segments
Disaggregation of Revenue [Line Items]
Total operating revenues	2,543	6,314	3,955
Haynesville | Exploration and Production | Operating Segments
Disaggregation of Revenue [Line Items]
Total operating revenues	1,566	4,263	682
Other | Exploration and Production | Operating Segments
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 0	$ 0	$ 3