ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - CHANGES IN AOCI AND RECLASSIFICATION OUT OF AOCI (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2022
Accumulated Other Comprehensive Income/(Loss)		$ (12,266)		$ (12,266)		$ (12,189)
OCI before Reclassifications	[1]			(98)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[2]			14
Other Comprehensive Income (Loss), Net of Tax		241	$ 112	(84)	$ 292
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest				(7)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income/(Loss)		18		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
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)		19		19		27
OCI before Reclassifications	[1]			(22)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[2]			14
Other Comprehensive Income (Loss), Net of Tax				(8)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest				0
Other Comprehensive Income (Loss) before Reclassifications, Tax	[1]			(13)
Reclassification from AOCI, Current Period, Tax	[2]			7
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income/(Loss)		$ (12,303)		(12,303)		$ (12,236)
OCI before Reclassifications	[1]			(74)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[2]			0
Other Comprehensive Income (Loss), Net of Tax				(74)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest				(7)
Other Comprehensive Income (Loss) before Reclassifications, Tax	[1]			(230)
Reclassification from AOCI, Current Period, Tax	[2]			$ 0

[1] Net of tax (benefit)/expense of $(1), $(13) and $(230) 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 (benefit)/expense of $0, $7 and $0 for gains/losses on investment securities, postretirement benefit plans and foreign currency translation, respectively.