POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - AMOUNTS EXPECTED TO BE AMORTIZED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME INTO NET PERIODIC BENEFIT COST (Details) - Subsequent Event $ in Millions |
12 Months Ended |
|---|---|
|
Jun. 30, 2017
USD ($)
| |
| Pension Plan | |
| Defined Benefit Plan Disclosure [Line Items] | |
| Defined Benefit Plan, Future Amortization of Gain (Loss) | $ 400 |
| Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) | 28 |
| Other Retiree Benefits | |
| Defined Benefit Plan Disclosure [Line Items] | |
| Defined Benefit Plan, Future Amortization of Gain (Loss) | 126 |
| Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) | $ (45) |