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ACQUISITIONS AND INVESTMENTS - Narrative (Details) - USD ($) $ in Millions | Oct. 01, 2021 | Feb. 10, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Feb. 29, 2020 | Apr. 30, 2019
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Kount |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, voting interests acquired (as a percent) |  | 100.00% |  |  |  |
Cash consideration paid for business combination |  | $ 640 |  |  |  |
Hiretech and i2Verify |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, voting interests acquired (as a percent) |  |  |  | 100.00% |  |
Health e(fx) and Teletrack |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, voting interests acquired (as a percent) |  |  | 100.00% |  |  |
Appriss Insights |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, voting interests acquired (as a percent) | 100.00% |  |  |  |  |
Cash consideration paid for business combination | $ 1,825 |  |  |  |  |
India Joint Venture |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Additional remaining interest acquired (as a percent) |  |  |  |  | 40.60% |
PayNet |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, voting interests acquired (as a percent) |  |  |  |  |  | 100.00%

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