RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - DERIVATIVE INSTRUMENTS, EFFECT ON OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 17,912		$ 17,912		$ 18,538
Derivative Asset		91		91		33
Derivative Liability		(455)		(455)		(1,118)
Derivatives in Net Investment Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		53	$ 64	182	$ 179
Accumulated Other Comprehensive Income, Gain (Loss)		$ 262	$ (242)	$ 102	$ (406)
Derivatives in Net Investment Hedging Relationships | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Description of Location of Gain (Loss) on Net Investment Hedges in Financial Statements	[1],[2]	269	(266)	67	(571)
Derivative, Notional Amount		$ 10,926		$ 10,926		11,005
Derivative Asset		79		79		26
Derivative Liability		(108)		(108)		(631)
Derivatives in Fair Value Hedging Relationships | Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		3,030		3,030		4,044
Derivative Asset		0		0		0
Derivative Liability		(323)		(323)		(445)
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		13,956		13,956		15,049
Derivative Asset		79		79		26
Derivative Liability		(432)		(432)		(1,076)
Not Designated as Hedging Instrument | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		3,956		3,956		3,489
Derivative Asset		12		12		7
Derivative Liability		$ (23)		$ (23)		$ (42)

[1] For the derivatives in net investment hedging relationships, the amount of gain excluded from effectiveness testing, which was recognized in earnings, was $53 and $64 for the three months ended March 31, 2024 and 2023, respectively. The amount of gain excluded from effectiveness testing was $182 and $179 for the nine months ended March 31, 2024 and 2023, respectively.

[2] In addition to the foreign currency derivative contracts designated as net investment hedges, certain of our foreign currency denominated debt instruments are designated as net investment hedges. The amount of gain/(loss) recognized in Accumulated other comprehensive income (AOCI) for such instruments was $262 and $(242) for the three months ended March 31, 2024 and 2023, respectively. The amount of gain/(loss) recognized in Accumulated other comprehensive income (AOCI) for such instruments was $102 and $(406) for the nine months ended March 31, 2024 and 2023, respectively.