RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - DERIVATIVE NOTIONAL AMOUNTS AND FAIR VALUE (Details) - USD ($) $ in Millions |
Sep. 30, 2016 |
Jun. 30, 2016 |
|---|---|---|
| Derivatives Not Designated as Hedging Instruments | Foreign Currency Contracts | ||
| Derivative [Line Items] | ||
| Notional Amount | $ 4,641 | $ 6,482 |
| Fair Value Asset/(Liability) | (20) | (10) |
| Derivatives in Cash Flow Hedging Relationships | Foreign Currency Contracts | ||
| Derivative [Line Items] | ||
| Notional Amount | 798 | 798 |
| Fair Value Asset/(Liability) | 18 | 31 |
| Derivatives in Fair Value Hedging Relationships | Interest Rate Contracts | ||
| Derivative [Line Items] | ||
| Notional Amount | 5,013 | 4,993 |
| Fair Value Asset/(Liability) | 343 | 371 |
| Derivatives in Net Investment Hedging Relationships | ||
| Derivative [Line Items] | ||
| Notional Amount | 3,013 | 3,013 |
| Fair Value Asset/(Liability) | $ (121) | $ (87) |