RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - GAIN (LOSS) ON DERIVATIVE INSTRUMENTS (EFFECTIVE PORTION) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Mar. 31, 2016	Jun. 30, 2015
Derivatives in Cash Flow Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (4)	$ 4
Derivatives in Cash Flow Hedging Relationships | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in AOCI on Derivatives (Effective Portion)	(3)	(1)
Derivatives in Cash Flow Hedging Relationships | Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in AOCI on Derivatives (Effective Portion)	(1)	5
Derivatives in Net Investment Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (52)	$ 60