Acquisitions (Schedule of Merger Related Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Transition services			$ 18	$ 0
Professional fees (bank, legal, consulting)	$ 0	$ 23	1	26
Representation & warranty insurance	0	4	0	4
Contract buyouts, terminations and transfers	0	5	3	5
Due diligence and environmental			2	0
Employee-related	0	1	1	2
Other	0	2	2	2
Merger-related expenses	0	35	27	39
Indigo Natural Resources, LLC
Business Acquisition [Line Items]
Transition services			0	0
Professional fees (bank, legal, consulting)	0	23	0	25
Representation & warranty insurance	0	4	0	4
Contract buyouts, terminations and transfers	0	5	1	5
Due diligence and environmental			1	0
Employee-related	0	1	0	1
Other	0	2	0	2
Merger-related expenses	0	35	2	37
GEPH Merger
Business Acquisition [Line Items]
Transition services			18
Professional fees (bank, legal, consulting)	0		1
Representation & warranty insurance	0		0
Contract buyouts, terminations and transfers	0		2
Due diligence and environmental			1
Employee-related	0		1
Other	0		2
Merger-related expenses	$ 0		$ 25
Montage Resources Corporation
Business Acquisition [Line Items]
Transition services				0
Professional fees (bank, legal, consulting)		0		1
Representation & warranty insurance		0		0
Contract buyouts, terminations and transfers		0		0
Due diligence and environmental				0
Employee-related		0		1
Other		0		0
Merger-related expenses		$ 0		$ 2