ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - NET OF TAX EXPENSE (BENEFIT) (Details) $ in Millions	9 Months Ended
	Mar. 31, 2019 USD ($)
Accumulated Other Comprehensive Income (Loss), Derivative Qualifying as Hedge, Excluded Component, Including Portion Attributable to Noncontrolling Interest [Member]
Other Comprehensive Income (Loss) before Reclassifications, Tax	$ 122	[1]
Reclassification from AOCI, Current Period, Tax	0	[2]
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Other Comprehensive Income (Loss) before Reclassifications, Tax	0	[1]
Reclassification from AOCI, Current Period, Tax	0	[2]
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest
Other Comprehensive Income (Loss) before Reclassifications, Tax	43	[1]
Reclassification from AOCI, Current Period, Tax	$ 48	[2]

[1] Net of tax expense/(benefit) of $122, $0 and $43 for gains/losses on hedges, investment securities and pension and other retiree benefit items, respectively.

[2] Net of tax expense/(benefit) of $0, $0 and $48 for gains/losses on hedges, investment securities and pension and other retiree benefit items, respectively.