Leases - Summary of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 1	$ 3	$ 3	$ 5
Short-term lease cost	4	4	7	11
Variable Lease, Cost			1
Total Lease Cost	5	7	11	16
Gathering and Processing
Lessee, Lease, Description [Line Items]
Operating lease cost	1	3	3	5
Short-term lease cost	4	4	7	10
Variable Lease, Cost			1
Total Lease Cost	5	7	11	15
Transportation and Storage
Lessee, Lease, Description [Line Items]
Operating lease cost	0	0	0	0
Short-term lease cost	0	0	0	1
Variable Lease, Cost			0
Total Lease Cost	$ 0	$ 0	$ 0	$ 1