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, 2019	Jun. 30, 2018
Derivative, Notional Amount	$ 17,309	$ 13,793
Derivative Asset	239	196
Derivative Liability	(45)	(184)
Net Investment Hedging
Derivative, Notional Amount	3,157	1,848
Derivative Asset	35	41
Derivative Liability	(24)	(75)
Designated as Hedging Instrument
Derivative, Notional Amount	10,878	6,435
Derivative Asset	212	166
Derivative Liability	(25)	(128)
Interest Rate Contract | Fair Value Hedging
Derivative, Notional Amount	7,721	4,587
Derivative Asset	177	125
Derivative Liability	(1)	(53)
Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivative, Notional Amount	6,431	7,358
Derivative Asset	27	30
Derivative Liability	$ (20)	$ (56)