ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - NET OF TAX EXPENSE (BENEFIT) (Details) $ in Millions	6 Months Ended
	Dec. 31, 2018 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	$ 61	[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	38	[1]
Reclassification from AOCI, Current Period, Tax	$ 32	[2]

[1] Net of tax expense/(benefit) of $61, $0 and $38 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 $32 for gains/losses on hedges, investment securities and pension and other retiree benefit items, respectively.