RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - SCHEDULE OF DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Millions	Mar. 31, 2022	Jun. 30, 2021
Derivative [Line Items]
Derivative, Notional Amount	$ 20,585	$ 20,959
Derivative Asset	405	255
Derivative Liability	(218)	(116)
Derivatives in Fair Value Hedging Relationships | Interest Rate Contracts
Derivative [Line Items]
Derivative, Notional Amount	5,241	7,415
Derivative Asset	15	146
Derivative Liability	(182)	0
Derivatives in Net Investment Hedging Relationships | Foreign Exchange Contract
Derivative [Line Items]
Derivative, Notional Amount	8,428	8,484
Derivative Asset	359	89
Derivative Liability	(10)	(94)
Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	13,669	15,899
Derivative Asset	374	235
Derivative Liability	(192)	(94)
Not Designated as Hedging Instrument | Foreign Exchange Contract
Derivative [Line Items]
Derivative, Notional Amount	6,916	5,060
Derivative Asset	31	20
Derivative Liability	$ (26)	$ (22)