REDEMABLE NONCONTROLLING INTEREST - ALTUS - Activity Related to Preferred Units (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	Jun. 12, 2019 USD ($)
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance			$ 555
Ending balance	$ 600		600
Altus Preferred Unit limited partners
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance	592	$ 521	555	$ 0
Allocation of Altus Midstream LP net income	19	18	56	22
Ending balance	600	$ 539	600	$ 539
Altus Midstream LP
Increase (Decrease) in Temporary Equity [Roll Forward]
Preferred Units embedded derivative	179		179		$ 94
Redeemable Noncontrolling Interest, Net Of Embedded Derivative Liability	$ 779		$ 779
Preferred units, redemption terms, internal rate of return	11.50%		11.50%
Preferred units, invested capital	$ 813		$ 813
Preferred units, redemption price	$ 709		$ 709
Altus Midstream LP | Altus Preferred Unit limited partners
Movement In Preferred Units [Roll Forward]
Preferred units: beginning of period (in shares) | shares			638,163
Distribution of in-kind additional preferred units (in shares) | shares			22,531
Preferred units: end of period (in shares) | shares	660,694		660,694
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance			$ 555
Distribution of in-kind additional Preferred Units			0
Cash distributions to Altus Preferred Unit limited partners			(11)
Allocation of Altus Midstream LP net income			56
Ending balance	$ 600		$ 600
Preferred Units embedded derivative					$ 94
Preferred units, redemption terms, multiple of invested capital	1.3		1.3