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EMPLOYEE BENEFIT PLANS (Items Not Yet Recognized as a Component of Postretirement Expense) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jun. 30, 2018
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Retirement Income Plans [Member] | Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain) | $ 236 | $ 242
Prior service benefit | 0 |
Net deferred income tax (assets) liabilities | (56) |
Accumulated other comprehensive loss (income) | 180 |
Retirement Health Care [Member] | Retirement Health Care Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss (gain) | (18) | $ (17)
Prior service benefit | (2) |
Net deferred income tax (assets) liabilities | 5 |
Accumulated other comprehensive loss (income) | $ (15) |

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