REDEMABLE NONCONTROLLING INTEREST - ALTUS - Activity Related to Preferred Units (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 12, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance			$ 555
Ending balance	$ 592		592
Altus Preferred Unit limited partners
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance	573	$ 0	555	$ 0
Allocation of Altus Midstream LP net income	19	4	37	4
Ending balance	592	$ 521	592	$ 521
Altus Midstream LP
Increase (Decrease) in Temporary Equity [Roll Forward]
Preferred Units embedded derivative	175		175		$ 94
Redeemable Noncontrolling Interest, Net Of Embedded Derivative Liability	767		767
Preferred units, redemption price	$ 701		$ 701
Preferred units, redemption terms, internal rate of return	11.50%		11.50%
Altus Midstream LP | Altus Preferred Unit limited partners
Movement In Preferred Units [Roll Forward]
Preferred units: beginning of period (in shares)			638,163
Distribution of in-kind additional preferred units (in shares)			22,531
Preferred units: end of period (in shares)	660,694		660,694
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance			$ 555
Distribution of in-kind additional Preferred Units			0
Allocation of Altus Midstream LP net income			37
Ending balance	$ 592		$ 592
Preferred Units embedded derivative					$ 94