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OTHER CONTINGENCIES, GUARANTEES AND COMMITMENTS (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2017
Loss Contingencies [Line Items] |  |  |
Liability for aggregate future remediation costs | $ 28 | $ 28 |
Letter of credit | 11 | 10 |
Letter of credit, amount outstanding | 0 | 0 |
Alameda County, California Matter |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for aggregate future remediation costs | $ 14 | 14 | $ 14
Remediation period (in years) | 30 years |  |
Maximum undiscounted costs | $ 28 |  |
Dickinson County, Michigan Matter |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for aggregate future remediation costs | $ 10 | $ 10 |
Remediation period (in years) | 30 years |  |
Percentage of liability for aggregate remediation and associated costs, other than legal fees | 24.30% |  |

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