JOINT VENTURES - Other (Details) $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Jul. 31, 2019 USD ($) well $ / shares shares	Sep. 30, 2019	Dec. 31, 2019 USD ($) shares	Apr. 30, 2017 USD ($)	Apr. 01, 2017
JOINT VENTURES
Working interest retained by CRC (as a percent)	10.00%
CRC's working interest if MIRA receives cash distributions equal to a predetermined threshold return (as a percent)	82.50%
Alpine JV
JOINT VENTURES
Initial commitment	$ 320
Potential total investment commitment in joint venture	$ 500
Joint venture investment period	3 years
Number of wells agreed for drilling under JV program | well	275
Funding provided by MIRA for development of properties (as a percent)	100.00%
Working interest acquired by MIRA (as a percent)	90.00%
Colony Capital, Inc.
JOINT VENTURES
Warrant outstanding (in shares) | shares	1,250		200
Warrant exercise price (in dollars per share) | $ / shares	$ 40
Term of tranche		5 years	5 years
Joint Venture With Macquarie Infrastructure And Real Assets Inc | MIRA
JOINT VENTURES
Funding provided by MIRA for development of properties (as a percent)					100.00%
Working interest acquired by MIRA (as a percent)				90.00%
Working interest retained by CRC (as a percent)				10.00%
CRC's working interest if MIRA receives cash distributions equal to a predetermined threshold return (as a percent)				75.00%
Amended commitment amount			$ 138	$ 140