Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Nov. 11, 2021
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2021
Entity File Number	001-40853
Entity Registrant Name	Kyndryl Holdings, Inc
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	86-1185492
Entity Address, Address Line One	One Vanderbilt Avenue, 15th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10017
City Area Code	212
Local Phone Number	896-2098
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	KD
Security Exchange Name	NYSE
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Central Index Key	0001867072
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		224,136,041
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3