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EMPLOYEE BENEFIT PLANS (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Other Postretirement Benefits Plan [Member] | Retirement Health Care Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit | $ 1 | $ 1 | $ 1 | $ 1
Other Postretirement Benefits Plan [Member] | Retirement Income Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit | (2) | (4) | (5) | (8)
UNITED STATES | Retirement Income Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discretionary contributions | $ 2 | $ 2 | $ 4 | $ 4

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