DEBT - Alliance with Obsidian Resources, L.L.C. (Details) - DrillCo Agreement $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 10, 2018 USD ($)
Debt Instrument [Line Items]
Maximum funding amount through joint venture		$ 300
Percentage of funded costs associated with wells drilled		85.00%
Percentage of working interest on wells expected to receive		80.00%
Cumulative percentage of certain payout thresholds		9.00%
Internal rate of return		13.00%
Interest rate upon reaching final internal rate of return		85.00%
Amounts received from joint venture	$ 36
Wells drilled and completed under joint venture agreement	11
CEMOF
Debt Instrument [Line Items]
Interest rate upon reaching final internal rate of return		15.00%