PENSION, DEFERRED COMPENSATION AND POST-RETIREMENT BENEFIT PLANS - Amounts Recognized in AOCI (Before Tax) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 1,433	$ 1,366
Pension Plans Retirement Growth Account
Defined Benefit Plan Disclosure
Projected benefit obligation	767	769
Accumulated benefit obligation	721	726
Fair value of plan assets	838	781
Pension Plans Restoration
Defined Benefit Plan Disclosure
Projected benefit obligation	129	134
Accumulated benefit obligation	113	120
Pension Plans | International
Defined Benefit Plan Disclosure
Projected benefit obligation	588	605	$ 616
Accumulated benefit obligation	533	540
Fair value of plan assets	561	548	$ 529
Defined benefit plans with obligations in excess of plan assets:
Pension plans with projected benefit obligations in excess of the plans' assets, aggregate projected benefit obligations	283	281
Pension plans with projected benefit obligations in excess of the plans' assets, aggregate fair value of plan assets	146	137
Defined benefit plans with accumulated benefit obligations in excess of plan assets:
Pension plans with accumulated benefit obligations in excess of the plans' assets, aggregate accumulated benefit obligations	221	220
Pension plans with accumulated benefit obligations in excess of the plans' assets, aggregate fair value of plan assets	$ 108	$ 103