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		6 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		$ 17	$ 16	$ 32	$ 30
Accumulated Other Comprehensive Income, Gain (Loss)		$ 264	$ (595)	$ 567	$ (1,241)
Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Description of Location of Gain (Loss) on Net Investment Hedges in Financial Statements	[1],[2]	218	(352)	426	(538)

[1] For the derivatives in net investment hedging relationships, the amount of gain excluded from effectiveness testing, which was recognized in earnings, was $17 and $16 for the three months ended December 31, 2021 and 2020, respectively. The amount of gain excluded from effectiveness testing was $32 and $30 for the six months ended December 31, 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 Accumulated other comprehensive income/(loss) (AOCI) for such instruments was $264 and $(595) for the three months ended December 31, 2021 and 2020, respectively. The amount of gain/(loss) recognized in AOCI for such instruments was $567 and $(1,241) for the six months ended December 31, 2021 and 2020, respectively.