| **EMPLOYEE BENEFIT PLANS (Retirement Income Plan's Assets Carried at Fair Value) (Details) - Retirement Income Plans [Member] - Other Postretirement Benefits Plan [Member] - USD ($) $ in Millions** | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | $ 485         | $ 420         | $ 434         |
| Fair Value, Inputs, Level 1 and 2 [Member]                                                                                                                                                            |          |          |          |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | 2             | 3             |          |
| Fair Value, Inputs, Level 1 [Member]                                                                                                                                                                  |          |          |          |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | 2             | 3             |          |
| Fair Value, Inputs, Level 2 [Member]                                                                                                                                                                  |          |          |          |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | 0             | 0             |          |
| Fair Value Measured at Net Asset Value Per Share [Member]                                                                                                                                             |          |          |          |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | 483           | 417           |          |
| Cash Equivalents [Member] | Fair Value, Inputs, Level 1 and 2 [Member]                                                                                                                                |          |          |          |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | 2             | 3             |          |
| Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]                                                                                                                                      |          |          |          |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | 2             | 3             |          |
| Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]                                                                                                                                      |          |          |          |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | 0             | 0             |          |
| Bond Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]                                                                                                                       |          |          |          |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | 393           | 299           |          |
| International Equity Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]                                                                                                       |          |          |          |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | 50            | 60            |          |
| Domestic Equity Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]                                                                                                            |          |          |          |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | 39            | 44            |          |
| Defined Benefit Plan, Real Estate [Member] | Fair Value Measured at Net Asset Value Per Share [Member]                                                                                                |          |          |          |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                      |          |          |          |
| Total assets at fair value                                                                                                                                                                            | $ 1           | $ 14          |          |

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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| - Definition
Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.
+ References
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| X                                                                                                                                                                                  |
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