STATEMENT OF CONSOLIDATED CHANGES IN EQUITY (DEFICIT) AND NONCONTROLLING INTEREST - 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 Interest, Egypt	Noncontrolling Interest, Altus	Redeemable Noncontrolling Interest - Altus Preferred Unit Limited Partners
Beginning balance at Dec. 31, 2017											$ 0
Increase (Decrease) in Temporary Equity [Roll Forward]
Distributions to Altus Preferred Unit limited partners	$ (345)							$ (345)
Ending balance at Dec. 31, 2018											0
Beginning balance at Dec. 31, 2017	8,791	$ 259	$ 12,128	$ (2,088)	$ (2,887)	$ 4	$ 7,416	1,375
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to common stock	40			40			40
Net income attributable to noncontrolling interest									$ 245	$ 1
Distributions to noncontrolling interest	(345)							(345)
Pension & Postretirement benefit plans, net of tax	0
Common dividends	(380)		(380)				(380)
Common stock activity, net	(28)	1	(29)				(28)
Treasury stock activity, net	(305)				(305)		(305)
Proceeds from Altus transaction	628		222				222	406
Compensation expense	160		160				160
Other	5		5				5
Ending balance at Dec. 31, 2018	8,812	260	12,106	(2,048)	(3,192)	4	7,130	1,682
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of Altus Preferred Units											517
Net income attributable to Altus Preferred Unit limited partners											38
Distributions to Altus Preferred Unit limited partners	(305)							(305)
Ending balance at Dec. 31, 2019	555										555
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to common stock	(3,553)			(3,553)			(3,553)
Net income attributable to noncontrolling interest									167	(334)
Distributions to noncontrolling interest	(305)							(305)
Pension & Postretirement benefit plans, net of tax	13					13	13
Common dividends	(376)		(376)				(376)
Common stock activity, net	(21)	1	(22)				(21)
Compensation expense	61		61				61
Other	1				2	(1)	1
Ending balance at Dec. 31, 2019	4,465	261	11,769	(5,601)	(3,190)	16	3,255	1,210
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income attributable to Altus Preferred Unit limited partners											76
Distributions to Altus Preferred Unit limited partners									(91)	(5)	(23)
Ending balance at Dec. 31, 2020	608										608
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to common stock	(4,860)			(4,860)			(4,860)
Net income attributable to noncontrolling interest									(121)	1
Distributions to noncontrolling interest									$ (91)	$ (5)	$ (23)
Pension & Postretirement benefit plans, net of tax	(2)					(2)	(2)
Common dividends	(38)		(38)				(38)
Common stock activity, net	(17)	1	(18)				(17)
Compensation expense	23		23				23
Other	0		(1)		1		0
Ending balance at Dec. 31, 2020	$ (645)	$ 262	$ 11,735	$ (10,461)	$ (3,189)	$ 14	$ (1,639)	$ 994