DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Aug. 31, 2015 |
Aug. 31, 2014 |
May. 31, 2015 |
|
| Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract] | |||
| Net gains (losses) related to forward contracts | $ 97 | $ (31) | |
| Foreign Currency Forward Contracts Not Designated as Hedges [Member] | Forward contracts held to purchase U.S. Dollars [Member] | |||
| Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract] | |||
| Notional amounts of forward contracts | 2,000 | $ 2,200 | |
| Foreign Currency Forward Contracts Not Designated as Hedges [Member] | Forward contracts held to sell U.S. Dollars [Member] | |||
| Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract] | |||
| Notional amounts of forward contracts | $ 956 | $ 1,200 | |