| Document and Entity Information | Jan. 27, 2022 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 27, 2022 |
| Entity Registrant Name | Kyndryl Holdings, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40853 |
| Entity Tax Identification Number | 86-1185492 |
| Entity Address, Address Line One | One Vanderbilt Avenue, |
| Entity Address, Adress Line Two | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.01 per share |
| Trading Symbol | KD |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001867072 |
| Amendment Flag | false |
| Current Fiscal Year End Date | --03-31 |
