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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailment gain, before tax |  | $ 0 | $ (171) | $ 0
United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Aggregate cost of the defined contribution plans |  | 3 | 19 |
Domestic Defined Contribution Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Aggregate cost of the defined contribution plans |  | 57 | 63 | 64
International Defined Contribution Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Aggregate cost of the defined contribution plans |  | 4 | 5 | 6
Other Postretirement Benefits Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | 15 | 15 |
Accumulated benefit obligation |  | 115 | 105 | 474
Other Postretirement Benefits Plan | United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | $ 13 | $ 14 | $ 14
Curtailment gain, before tax | $ 171 |  |  |
Curtailment gain, after tax | $ 130 |  |  |

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