RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - SCHEDULE OF DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Millions	Dec. 31, 2021	Jun. 30, 2021
Derivative [Line Items]
Derivative, Notional Amount	$ 21,713	$ 20,959
Derivative Asset	446	255
Derivative Liability	(15)	(116)
Derivatives in Fair Value Hedging Relationships | Interest Rate Contracts
Derivative [Line Items]
Derivative, Notional Amount	6,302	7,415
Derivative Asset	52	146
Derivative Liability	(3)	0
Derivatives in Net Investment Hedging Relationships | Foreign Exchange Contract
Derivative [Line Items]
Derivative, Notional Amount	8,530	8,484
Derivative Asset	348	89
Derivative Liability	(2)	(94)
Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	14,832	15,899
Derivative Asset	400	235
Derivative Liability	(5)	(94)
Not Designated as Hedging Instrument | Foreign Exchange Contract
Derivative [Line Items]
Derivative, Notional Amount	6,881	5,060
Derivative Asset	46	20
Derivative Liability	$ (10)	$ (22)