RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - DERIVATIVE INSTRUMENTS, EFFECT ON OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 19,686		$ 19,686		$ 18,538
Derivative Asset		42		42		33
Derivative Liability		(671)		(671)		(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		62	$ 69	130	$ 115
Accumulated Other Comprehensive Income, Gain (Loss)		$ (504)	$ (862)	$ (159)	$ (164)
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]	(487)	(1,013)	(202)	(305)
Derivative, Notional Amount		$ 12,267		$ 12,267		11,005
Derivative Asset		5		5		26
Derivative Liability		(347)		(347)		(631)
Derivatives in Fair Value Hedging Relationships | Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		3,098		3,098		4,044
Derivative Asset		0		0		0
Derivative Liability		(317)		(317)		(445)
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		15,365		15,365		15,049
Derivative Asset		5		5		26
Derivative Liability		(664)		(664)		(1,076)
Not Designated as Hedging Instrument | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		4,321		4,321		3,489
Derivative Asset		37		37		7
Derivative Liability		$ (7)		$ (7)		$ (42)

[1] For the derivatives in net investment hedging relationships, the amount of gain excluded from effectiveness testing, which was recognized in earnings, was $62 and $69 for the three months ended December 31, 2023 and 2022, respectively. The amount of gain excluded from effectiveness testing was $130 and $115 for the six months ended December 31, 2023 and 2022, 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 loss recognized in Accumulated other comprehensive income (AOCI) for such instruments was $(504) and $(862) for the three months ended December 31, 2023 and 2022, respectively. The amount of loss recognized in Accumulated other comprehensive income (AOCI) for such instruments was $(159) and $(164) for the six months ended December 31, 2023 and 2022, respectively.