REDEMABLE NONCONTROLLING INTEREST - ALTUS - Activity Related to Preferred Units (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Nov. 14, 2019	Sep. 30, 2019	Sep. 30, 2019	Jun. 12, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance			$ 0
Ending balance		$ 539	539
Altus Preferred Unit limited partners
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance		521	0
Issuance of Preferred Units, net			517
Allocation of Altus Midstream LP net income		18	22
Ending balance		539	539
Altus Midstream LP
Increase (Decrease) in Temporary Equity [Roll Forward]
Embedded derivative liability		98	98	$ 94
Redeemable Noncontrolling Interest, Net Of Embedded Derivative Liability		637	637
Preferred Units, Redemption Price		$ 646	$ 646
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
Distribution of in-kind additional Preferred Units (in shares)			2,188
Preferred Units: end of period (in shares)		627,188	627,188
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance			$ 0
Issuance of Preferred Units, net		$ 517
Distribution of in-kind additional Preferred Units		0
Allocation of Altus Midstream LP net income		21
Accreted value adjustment		1
Ending balance		$ 539	$ 539
Embedded derivative liability				$ 94
Preferred Units, redemption terms, internal rate of return		11.50%	11.50%
Altus Midstream LP | Scenario, Forecast
Increase (Decrease) in Temporary Equity [Roll Forward]
Preferred Units, distribution in-kind	$ 11
Preferred Units, distribution, PIK units	10,975.8