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EMPLOYEE BENEFIT PLANS - Schedule of Retirement Income Plans Assets Carried at Fair Value (Details) - Other Postretirement Benefits Plan - USD ($) $ in Millions | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 27 | $ 25 | $ 381
Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Total common collective trust measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 27 | 25 |
Cash equivalents — Level 1 | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Bond funds | Total common collective trust measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 6 | 6 |
International equity funds | Total common collective trust measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 17 | 16 |
Real estate fund | Total common collective trust measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 2 | 2 |
Other | Total common collective trust measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 2 | $ 1 |

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