RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - NOTIONAL AMOUNTS AND FAIR VALUES OF QUALIFYING AND NON-QUALIFYING FINANCIAL INSTRUMENTS USED IN HEDGING TRANSACTIONS (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Derivative, Notional Amount	$ 16,956	$ 17,309
Derivative Asset	318	239
Derivative Liability	(66)	(45)
Net Investment Hedging
Derivative, Notional Amount	3,856	3,157
Derivative Asset	26	35
Derivative Liability	(41)	(24)
Designated as Hedging Instrument
Derivative, Notional Amount	10,970	10,878
Derivative Asset	295	212
Derivative Liability	(41)	(25)
Interest Rate Contract | Fair Value Hedging
Derivative, Notional Amount	7,114	7,721
Derivative Asset	269	177
Derivative Liability	0	(1)
Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivative, Notional Amount	5,986	6,431
Derivative Asset	23	27
Derivative Liability	$ (25)	$ (20)