RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - DERIVATIVE NOTIONAL AMOUNTS AND FAIR VALUE (Details) - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 951	$ 951
Derivative Assets (Liabilities), at Fair Value, Net	298	312
Fair Value Hedging [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	6,720	7,208
Derivative Assets (Liabilities), at Fair Value, Net	248	159
Net Investment Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	505	537
Derivative Assets (Liabilities), at Fair Value, Net	88	95
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	7,561	6,610
Derivative Assets (Liabilities), at Fair Value, Net	$ (6)	$ (55)