REEDEMABLE NONCONTROLLING INTEREST - ALTUS - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Jun. 12, 2019	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Class of Stock [Line Items]
Redeemable noncontrolling interest - Altus Preferred Unit limited partners			$ 611	$ 0
Altus Midstream LP
Class of Stock [Line Items]
Preferred Units, redemption terms, internal rate of return		11.50%	11.50%
Embedded derivative	$ 94	$ 94	$ 94
Altus Midstream LP | 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, redemption terms, internal rate of return		11.50%	11.50%
Preferred Units, redemption terms, internal rate of return after fifth anniversary of closing		13.75%	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%	6.00%
Maximum amount of distributions to common unit holders	650
Issue discount	4
Transaction costs	10
Embedded derivative	$ 94