POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - ONE-PERCENTAGE POINT CHANGE IN ASSUMED HEALTH CARE COST TREND RATES (Details) $ in Millions |
12 Months Ended |
|---|---|
|
Jun. 30, 2016
USD ($)
| |
| Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract] | |
| Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components | $ 80 |
| Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components | (59) |
| Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation | 1,057 |
| Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation | $ (809) |