STATEMENT OF CONSOLIDATED CHANGES IN EQUITY (DEFICIT) AND NONCONTROLLING INTEREST (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Paid-In Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	APACHE SHAREHOLDERS’ EQUITY (DEFICIT)	Noncontrolling Interests	Noncontrolling interests, Egypt	Noncontrolling interests, Altus	Altus Preferred Unit limited partners
Beginning balance at Dec. 31, 2018											$ 0
Increase (Decrease) In Redeemable Noncontrolling Interest [Roll Forward]
Issuance of Altus Preferred Units											517
Net income attributable to Altus Preferred Unit limited partners											22
Ending balance at Sep. 30, 2019											539
Beginning balance at Dec. 31, 2018	$ 8,812	$ 260	$ 12,106	$ (2,048)	$ (3,192)	$ 4	$ 7,130	$ 1,682
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to common stock	(577)			(577)			(577)
Net income (loss) attributable to noncontrolling interest									$ 125	$ (5)	22
Distributions to noncontrolling interest - Egypt	(235)							(235)
Common dividends	(282)		(282)				(282)
Other	30	1	28		2		30
Ending balance at Sep. 30, 2019	7,868	261	11,852	(2,625)	(3,190)	3	6,301	1,567
Beginning balance at Jun. 30, 2019											521
Increase (Decrease) In Redeemable Noncontrolling Interest [Roll Forward]
Net income attributable to Altus Preferred Unit limited partners											18
Ending balance at Sep. 30, 2019											539
Beginning balance at Jun. 30, 2019	8,154	261	11,931	(2,455)	(3,190)	4	6,551	1,603
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to common stock	(170)			(170)			(170)
Net income (loss) attributable to noncontrolling interest									38	(3)	18
Distributions to noncontrolling interest - Egypt	(71)							(71)
Common dividends	(94)		(94)				(94)
Other	14		15				14
Ending balance at Sep. 30, 2019	7,868	261	11,852	(2,625)	(3,190)	3	6,301	1,567
Beginning balance at Dec. 31, 2019	555										555
Increase (Decrease) In Redeemable Noncontrolling Interest [Roll Forward]
Net income attributable to Altus Preferred Unit limited partners											56
Ending balance at Sep. 30, 2020	600										600
Beginning balance at Dec. 31, 2019	4,465	261	11,769	(5,601)	(3,190)	16	3,255	1,210
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to common stock	(4,870)			(4,870)			(4,870)
Net income (loss) attributable to noncontrolling interest									(138)	(7)	56
Distributions to noncontrolling interest - Egypt	(61)							(61)			(11)
Common dividends	(29)		(29)				(29)
Other	3	1	1		1	0	3
Ending balance at Sep. 30, 2020	(637)	262	11,741	(10,471)	(3,189)	16	(1,641)	1,004
Beginning balance at Jun. 30, 2020											592
Increase (Decrease) In Redeemable Noncontrolling Interest [Roll Forward]
Net income attributable to Altus Preferred Unit limited partners											19
Ending balance at Sep. 30, 2020	600										600
Beginning balance at Jun. 30, 2020	(636)	262	11,744	(10,467)	(3,189)	15	(1,635)	999
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to common stock	(4)			(4)			(4)
Net income (loss) attributable to noncontrolling interest									$ 24	$ 2	19
Distributions to noncontrolling interest - Egypt	(21)							(21)			$ (11)
Common dividends	(10)		(10)				(10)
Other	8		7				8
Ending balance at Sep. 30, 2020	$ (637)	$ 262	$ 11,741	$ (10,471)	$ (3,189)	$ 16	$ (1,641)	$ 1,004