REEDEMABLE NONCONTROLLING INTEREST - ALTUS - Activity Related to Preferred Units (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Aug. 14, 2019	Jun. 30, 2019	Jun. 30, 2019	Jun. 12, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance			$ 0
Ending balance		$ 521	521
Altus Preferred Unit limited partners
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance		0	0
Issuance of Preferred Units, net		517	517
Allocation of Altus Midstream net income		4	4
Ending balance		521	521
Altus Midstream LP
Increase (Decrease) in Temporary Equity [Roll Forward]
Embedded derivative liability		94	94	$ 94
Redeemable Noncontrolling Interest, Net Of Embedded Derivative Liability		615	615
Preferred Units, Redemption Price		$ 628	$ 628
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)			0
Issuance of Preferred Units, net (in shares)			625,000
Preferred Units: end of period (in shares)		625,000	625,000
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance			$ 0
Issuance of Preferred Units, net		$ 517
Allocation of Altus Midstream net income		3
Accreted value adjustment		1
Ending balance		$ 521	$ 521
Embedded derivative liability				$ 94
Preferred Units, redemption terms, internal rate of return		11.50%	11.50%
Altus Midstream LP | Scenario, Forecast | Subsequent Event
Increase (Decrease) in Temporary Equity [Roll Forward]
Preferred Units, distribution in-kind	$ 2
Preferred Units, distribution, PIK units	2,187.5