RETIREMENT BENEFIT OBLIGATIONS - Summary of Changes in Fair Value of Investments Reflected as Level 3 Assets (Details) - USD ($) $ in Millions |
12 Months Ended | |
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Jun. 30, 2025 |
Jun. 30, 2024 |
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| Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | ||
| Fair value of plan assets, beginning of the year | $ 886 | $ 933 |
| Actual return on plan assets: | ||
| Fair value of plan assets, end of the year | 911 | 886 |
| Level 3 | ||
| Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | ||
| Fair value of plan assets, beginning of the year | 6 | 6 |
| Actual return on plan assets: | ||
| Actual return on plan assets, Relating to assets still held at end of period | 0 | 1 |
| Actual return on plan assets, Relating to assets sold during the period | 0 | 0 |
| Purchases, sales, settlements and issuances | 0 | (1) |
| Transfers in and out of Level 3 | 0 | 0 |
| Fair value of plan assets, end of the year | $ 6 | $ 6 |
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- References No definition available.
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Details
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