Commitments and Contingencies (Narrative) (Details)		9 Months Ended
	Jun. 12, 2018 individual company	Sep. 30, 2021 USD ($)
Commitments And Contingencies [Line Items]
Obligation under transportation agreements		$ 9,797,000,000
Guarantee obligations relative to the firms transportation agreements and gathering project and services		884,000,000
Loss contingency, number of individuals and entities | individual	51
Loss contingency, number of defendants | company	15
Material liabilities recognized		$ 0
Minimum
Commitments And Contingencies [Line Items]
Contractual commitments payments, term (in years)		2 years
Maximum
Commitments And Contingencies [Line Items]
Contractual commitments payments, term (in years)		7 years
Pending regulatory approval and/or construction
Commitments And Contingencies [Line Items]
Obligation under transportation agreements		$ 382,000,000
Indigo Agreement
Commitments And Contingencies [Line Items]
Obligation under transportation agreements		34,000,000
Liability for the estimated future payments		17,000,000
Purchase or volume commitments with gathering fresh water and sand
Commitments And Contingencies [Line Items]
Obligation under transportation agreements		$ 81,000,000