RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - DERIVATIVE INSTRUMENTS, EFFECT ON OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Derivatives in Net Investment Hedging Relationships - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		$ 14	$ 19
Accumulated Other Comprehensive Income, Gain (Loss)		(646)	609
Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	[1],[2]	$ (186)	$ 113

[1] For the derivatives in net investment hedging relationships, the amount of gain excluded from effectiveness testing, which was recognized in earnings, was $14 and $19 for the three months ended September 30, 2020 and 2019, respectively.

[2] In addition to the foreign currency derivative contracts designated as net investment hedges, certain of our foreign currency denominated debt instruments are designated as net investment hedges. The amount of gain/(loss) recognized in Accumulated other comprehensive income/(loss) (AOCI) for such instruments was $(646) and $609 for the three months ended September 30, 2020 and 2019, respectively.