RETIREMENT-RELATED BENEFITS - Contributions (Details) $ in Millions	3 Months Ended	9 Months Ended
Dec. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Retirement-Related Benefits
Employer contributions	$ 15	$ 27
Nonpension Postretirement Plans
Retirement-Related Benefits
Expected benefit payments, 2023	$ 37	$ 37

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration