SIGNIFICANT ACCOUNTING POLICIES - Kyndryl's Spin-off and Description of Business (Details)	Sep. 30, 2023 country
Minimum
Number of countries	100

The number of countries in which the entity operates as of balance sheet date.

No definition available.

Name:	us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant