Revenue Recognition (Disaggregation of Revenue on Geographic Basis) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 4,138	$ 1,050	$ 7,081	$ 2,122
E&P
Disaggregation of Revenue [Line Items]
Total operating revenues	2,931	718	5,008	1,437
Operating Segments | E&P
Disaggregation of Revenue [Line Items]
Total operating revenues	2,929	704	5,003	1,409
Operating Segments | E&P | Appalachia
Disaggregation of Revenue [Line Items]
Total operating revenues	1,776	704	3,097	1,408
Operating Segments | E&P | Haynesville
Disaggregation of Revenue [Line Items]
Total operating revenues	1,153	0	1,906	0
Operating Segments | E&P | Other
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 0	$ 0	$ 0	$ 1