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, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		$ 15	$ 14
Accumulated Other Comprehensive Income, Gain (Loss)		$ 303	$ (646)
Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Description of Location of Gain (Loss) on Net Investment Hedges in Financial Statements	[1],[2]	208	(186)

[1] For the derivatives in net investment hedging relationships, the amount of gain excluded from effectiveness testing, which was recognized in earnings, was $15 and $14 for the three months ended September 30, 2021 and 2020, 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 recognized in other comprehensive income/(loss) for such instruments was $303 and $(646) for the three months ended September 30, 2021 and 2020, respectively.