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POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - RECONCILIATION OF BENEFIT OBLIGATIONS AND PLAN ASSETS (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Pension Benefits      
CHANGE IN BENEFIT OBLIGATION      
Benefit obligation at beginning of year [1],[2] $ 17,053 $ 14,514  
Service cost 317 [2] 298 [2] $ 300
Interest cost 545 [2] 590 [2] 560
Participants' contributions [2] 19 20  
Amendments [2] 17 4  
Defined Benefit Plan, Actuarial Gain (Loss) [2] 524 1,365  
Acquisitions (divestitures) [2] 7 0  
Special termination benefits [2] 11 5  
Currency translation and other [2] (1,908) 797  
Benefit payments [2] (634) (540)  
BENEFIT OBLIGATION AT END OF YEAR [1],[2] 15,951 17,053 14,514
CHANGE IN PLAN ASSETS      
Fair value of plan assets at beginning of year [2] 11,098 8,561  
Actual return on plan assets [2] 1,016 964  
Employer contributions [2] 262 1,549  
Participants' contributions [2] 19 20  
Currency translation and other [2] (1,156) 544  
ESOP debt impacts [2],[3] 0 0  
Benefit payments [2] (634) (540)  
FAIR VALUE OF PLAN ASSETS AT END OF YEAR [2] 10,605 11,098 8,561
FUNDED STATUS [2] (5,346) (5,955)  
Other Retiree Benefits      
CHANGE IN BENEFIT OBLIGATION      
Benefit obligation at beginning of year [1],[4] 5,505 5,289  
Service cost 156 [4] 149 [4] 190
Interest cost 240 [4] 256 [4] 260
Participants' contributions [4] 71 72  
Amendments [4] (325) (5)  
Defined Benefit Plan, Actuarial Gain (Loss) [4] (399) (46)  
Acquisitions (divestitures) [4] 0 0  
Special termination benefits [4] 23 9  
Currency translation and other [4] (134) 20  
Benefit payments [4] (233) (239)  
BENEFIT OBLIGATION AT END OF YEAR [1],[4] 4,904 5,505 5,289
CHANGE IN PLAN ASSETS      
Fair value of plan assets at beginning of year [4] 3,574 3,553  
Actual return on plan assets [4] 10 124  
Employer contributions [4] 18 31  
Participants' contributions [4] 71 72  
Currency translation and other [4] (6) 0  
ESOP debt impacts [3],[4] 36 33  
Benefit payments [4] (233) (239)  
FAIR VALUE OF PLAN ASSETS AT END OF YEAR [4] 3,470 3,574 $ 3,553
FUNDED STATUS [4] $ (1,434) $ (1,931)  
[1] For the pension benefit plans, the benefit obligation is the projected benefit obligation. For other retiree benefit plans, the benefit obligation is the accumulated postretirement benefit obligation.
[2] Primarily non-U.S.-based defined benefit retirement plans.
[3] Represents the net impact of ESOP debt service requirements, which is netted against plan assets for other retiree benefits.
[4] Primarily U.S.-based other postretirement benefit plans.