ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - CHANGES IN AOCI AND RECLASSIFICATION OUT OF AOCI (Details) - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022
Accumulated Other Comprehensive Income/(Loss)		$ (12,811)		$ (12,189)
OCI before Reclassifications	[1]	(632)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[2]	5
Other Comprehensive Income (Loss), Net of Tax		(627)	$ (318)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest		(5)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income/(Loss)		18		20
OCI before Reclassifications	[1]	(2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[2]	0
Other Comprehensive Income (Loss), Net of Tax		(2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest		0
Other Comprehensive Income (Loss) before Reclassifications, Tax	[1]	(1)
Reclassification from AOCI, Current Period, Tax	[2]	0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income/(Loss)		114		27
OCI before Reclassifications	[1]	82
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[2]	5
Other Comprehensive Income (Loss), Net of Tax		87
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest		0
Other Comprehensive Income (Loss) before Reclassifications, Tax	[1]	9
Reclassification from AOCI, Current Period, Tax	[2]	2
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income/(Loss)		(12,943)		$ (12,236)
OCI before Reclassifications	[1]	(712)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[2]	0
Other Comprehensive Income (Loss), Net of Tax		(712)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest		(5)
Other Comprehensive Income (Loss) before Reclassifications, Tax	[1]	330
Reclassification from AOCI, Current Period, Tax	[2]	$ 0

[1] Net of tax (benefit)/expense of $(1), $9 and $330 for gains/losses on investment securities, postretirement benefit plans and foreign currency translation, respectively. Income tax effects within foreign currency translation include impacts from items such as net investment hedge transactions.

[2] Net of tax expense of $0, $2 and $0 for gains/losses on investment securities, postretirement benefit plans and foreign currency translation, respectively.