RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - DERIVATIVE INSTRUMENTS, EFFECT ON OTHER COMPREHENSIVE INCOME (LOSS) - ADDITIONAL INFORMATION (Details) - Derivatives in Net Investment Hedging Relationships - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 21	$ 13	$ 40	$ 27
Accumulated Other Comprehensive Income, Gain (Loss)	$ (428)	$ 228	$ 181	$ 241