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) |