RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - Notional Amounts And Fair Values Of Qualifying And Non-Qualifying Financial Instruments Used In Hedging Transactions (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 18,730	$ 16,325
Fair Value Asset	19	120
Fair Value (Liability)	(1,062)	(379)
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	15,154	13,133
Fair Value Asset	0	119
Fair Value (Liability)	(1,061)	(356)
Interest rate contracts | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	3,280	2,993
Fair Value Asset	0	0
Fair Value (Liability)	(201)	(325)
Foreign currency contracts | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	3,576	3,192
Fair Value Asset	19	1
Fair Value (Liability)	0	(23)
Foreign currency contracts | Net Investment Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	11,874	10,140
Fair Value Asset	0	119
Fair Value (Liability)	$ (860)	$ (31)