POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - PENSION PLANS WITH ACCUMULATED AND PROJECTED BENEFIT OBLIGATIONS IN EXCESS OF PLAN ASSETS (Details) - USD ($) $ in Millions |
Jun. 30, 2015 |
Jun. 30, 2014 |
|---|---|---|
| Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | ||
| Projected benefit obligation | $ 13,411 | $ 14,229 |
| Accumulated benefit obligation | 11,918 | 12,406 |
| Fair value of plan assets | 7,931 | 8,353 |
| Projected Benefit Obligation Exceeds the Fair Value of Plan Assets | ||
| Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Benefit Obligation | 14,057 | 15,325 |
| Defined Benefit Plan, Pension Plans With Projected Benefit Obligations In Excess Of Plan Assets, Aggregate Accumulated Benefit Obligation | 12,419 | 13,279 |
| Defined Benefit Plan, Pension Plans With Projected Benefit Obligations In Excess Of Plan Assets, Aggregate Fair Value Of Plan Assets | $ 8,435 | $ 9,301 |