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RETIREMENT-RELATED BENEFITS - Nonpension Postretirement Benefits Plans and Mult-Employer Plans (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2021
Retirement-Related Benefit Plans Disclosures [Line Items]
Retirement and nonpension postretirement benefit obligations	$ 500	$ 504
Non Pension Postretirement Benefit Plans
Retirement-Related Benefit Plans Disclosures [Line Items]
Retirement and nonpension postretirement benefit obligations		$ 10
Discount rate	2.89%	3.02%	1.23%	1.04%
Fair Value of plan assets	$ 0	$ 0	$ 0	$ 0

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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