Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2022	Apr. 22, 2022
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	001-38126
Entity Interactive Data Current	Yes
Entity Registrant Name	Altice USA, Inc.
Entity Filer Category	Large Accelerated Filer
Document Fiscal Period Focus	FY
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		454,654,818
Entity Current Reporting Status	Yes
Entity Small Business	false
Entity Tax Identification Number	38-3980194
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	1 Court Square West
Entity Address, City or Town	Long Island City,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	11101
City Area Code	(516)
Local Phone Number	803-2300
Title of 12(b) Security	Class A Common Stock, par value $0.01 per share
Trading Symbol	ATUS
Security Exchange Name	NYSE
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Amendment Flag	false
Entity Central Index Key	0001702780