Revenue Recognition (Disaggregation of Revenue by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 15,002	$ 6,667	$ 2,308
Exploration and Production
Disaggregation of Revenue [Line Items]
Total operating revenues	10,583	4,701	1,391
Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	4,419	1,966	917
Operating Segments | Exploration and Production
Disaggregation of Revenue [Line Items]
Total operating revenues	10,577	4,640	1,348
Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	14,521	6,189	2,145
Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	10,096	4,162	1,185
Intersegment Revenues | Exploration and Production
Disaggregation of Revenue [Line Items]
Total operating revenues	(6)	(61)	(43)
Intersegment Revenues | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	10,102	4,223	1,228
Gas sales
Disaggregation of Revenue [Line Items]
Total operating revenues	9,101	3,412	967
Gas sales | Operating Segments | Exploration and Production
Disaggregation of Revenue [Line Items]
Total operating revenues	9,100	3,358	928
Gas sales | Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	0
Gas sales | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	(1)	(54)	(39)
Oil sales
Disaggregation of Revenue [Line Items]
Total operating revenues	439	394	154
Oil sales | Operating Segments | Exploration and Production
Disaggregation of Revenue [Line Items]
Total operating revenues	434	389	150
Oil sales | Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	0
Oil sales | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	(5)	(5)	(4)
NGL sales
Disaggregation of Revenue [Line Items]
Total operating revenues	1,046	890	265
NGL sales | Operating Segments | Exploration and Production
Disaggregation of Revenue [Line Items]
Total operating revenues	1,046	888	265
NGL sales | Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	0
NGL sales | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	0	(2)	0
Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	4,419	1,963	917
Marketing | Operating Segments | Exploration and Production
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	0
Marketing | Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	14,521	6,186	2,145
Marketing | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	10,102	4,223	1,228
Marketing | Intersegment Revenues | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	(10,100)	(4,200)	(1,200)
Other
Disaggregation of Revenue [Line Items]
Total operating revenues	(3)	8	5
Other | Operating Segments | Exploration and Production
Disaggregation of Revenue [Line Items]
Total operating revenues	(3)	5	5
Other | Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total operating revenues	0	3	0
Other | Intersegment Revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 0	$ 0	$ 0