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
	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 14	$ 31
Accumulated Other Comprehensive Income, Gain (Loss)	$ 207	$ 248