POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - Pension Plans With Accumulated And Projected Benefit Obligations In Excess Of Plan (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 8,175	$ 7,613
Fair value of plan assets	5,070	4,656
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	7,653	7,103
Fair value of plan assets	5,018	4,624
Other Retiree Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	802	770
Fair value of plan assets	$ 70	$ 79