RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - AMOUNT OF GAINS AND LOSSES ON OUTSTANDING DERIVATIVES - ADDITIONAL INFORMATION (Details) (Details) - Derivatives in Net Investment Hedging Relationships - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 13	$ 42	$ 27	$ 73
Accumulated Other Comprehensive Income, Gain (Loss)	$ 228	$ (176)	$ 241	$ (745)