RETIREMENT-RELATED BENEFITS - ABO and APBO in Excess of Plan Assets (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
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| Defined Benefit Plan, Pension and Non-Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets | ||
| Plans with PBO in excess of plan assets, Benefit Obligation | $ 753 | $ 745 |
| Plans with PBO in excess of plan assets, Plan Assets | 220 | 233 |
| Plans with ABO in excess of plan assets, Benefit Obligation | 637 | 605 |
| Plans with ABO in excess of plan assets, Plan Assets | 167 | 157 |
| Plans with assets in excess of PBO, Benefit Obligation | 822 | 818 |
| Plans with assets in excess of PBO, Plan Assets | $ 1,044 | $ 966 |
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- Definition If aggregate disclosures are presented, the aggregate benefit obligation for plans with plan assets in excess of the benefit obligation as of the measurement date of each statement of financial position presented. No definition available.
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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for plans with plan assets in excess of the benefit obligation as of the measurement date of each statement of financial position presented. No definition available.
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- Definition Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References No definition available.
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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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