POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - ESOP SHARES OUTSTANDING (Details) - shares shares in Thousands	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Series A Preferred Stock
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares	39,241	42,044	44,465
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares	6,095	7,228	8,474
Employee Stock Ownership Plan (ESOP), Shares in ESOP	45,336	49,272	52,939
Series B Preferred Stock
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares	23,925	23,074	22,085
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares	32,319	34,096	35,753
Employee Stock Ownership Plan (ESOP), Shares in ESOP	56,244	57,170	57,838