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