Cover - USD ($)	12 Months Ended
	Dec. 31, 2021	Jan. 31, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-38048
Entity Registrant Name	Altus Midstream Company
Entity Tax Identification Number	81-4675947
Entity Address, Address Line One	One Post Oak Central, 2000 Post Oak Boulevard, Suite 100,
Entity Address, City or Town	Houston,
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77056-4400
City Area Code	713
Local Phone Number	296-6000
Title of 12(b) Security	Class A common stock, $0.0001 par value
Trading Symbol	ALTM
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 219,150,084
Documents Incorporated by Reference	Portions of registrant’s proxy statement relating to registrant’s 2021 annual meeting of stockholders have been incorporated by reference in Part II and Part III of this Annual Report on Form 10-K.
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0001692787
Entity Incorporation, State or Country Code	DE
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		16,246,460
Class C Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0