Revenue Recognition (Disaggregation of Revenue on Geographic Basis) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 2,943	$ 1,072
E&P
Disaggregation of Revenue [Line Items]
Total operating revenues	2,077	719
Operating Segments | E&P
Disaggregation of Revenue [Line Items]
Total operating revenues	2,074	705
Operating Segments | E&P | Appalachia
Disaggregation of Revenue [Line Items]
Total operating revenues	1,321	704
Operating Segments | E&P | Haynesville
Disaggregation of Revenue [Line Items]
Total operating revenues	753	0
Operating Segments | E&P | Other
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 0	$ 1