ACCUMULATED OTHER COMPREHENSIVE INCOME - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	$ 78	$ (279)	$ (186)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(22)	(68)	$ (551)
Reclassification out of Accumulated Other Comprehensive Income
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	66	91
Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	78	(279)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(44)	(23)
Accumulated Net Investment Gain (Loss) Attributable to Parent
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 0	$ 0