REDEMABLE NONCONTROLLING INTEREST - ALTUS - Additional Information (Details) $ in Millions		12 Months Ended
	Jun. 12, 2019 USD ($) qtr	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Class of Stock [Line Items]
Redeemable noncontrolling interest - Altus Preferred Unit limited partners		$ 0	$ 611	$ 0
Altus Midstream LP
Class of Stock [Line Items]
Preferred Units, redemption terms, internal rate of return		11.50%
Preferred Units embedded derivative	$ 94	$ 139
Altus Midstream LP | Redeemable Noncontrolling Interest - Altus Preferred Unit Limited Partners
Class of Stock [Line Items]
Aggregate issue price of Preferred Units	625
Redeemable noncontrolling interest - Altus Preferred Unit limited partners	$ 611
Preferred Units, quarterly distribution rate per annum	7.00%
Preferred Units, increased quarterly distribution rate per annum upon specified events	10.00%
Preferred Units, distribution in-kind, number of quarters after issuance | qtr	6
Preferred Units, redemption terms, internal rate of return	11.50%
Preferred Units, redemption terms, internal rate of return after fifth anniversary of closing	13.75%
Preferred Units, redemption terms, multiple of invested capital	1.3	1.3
Preferred Units, exchangeable, number of preceding trading days	20 days
Preferred Units, exchangeable, discount percentage	6.00%
Maximum amount of distributions to common unit holders	$ 650
Issue discount	4
Transaction costs	10
Preferred Units embedded derivative	$ 94