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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details) | 12 Months Ended |
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Jun. 30, 2020 USD ($) instrument | Jun. 30, 2019 USD ($) instrument | Jun. 30, 2018 USD ($) instrument | Jun. 30, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Impairment | $ 0 |  |  |  |  |
Performance period for performance awards | 3 years |  |  |  |  |
Minimum percentage for calculating the amortization of actuarial gains and losses under the corridor approach | 5.00% |  |  |  |  |
Contract term | one year or less |  |  |  |  |
Allowance for doubtful accounts | $ 10,000,000 | $ 4,000,000 |  |  |  |
Nontrade receivables, current | $ 20,000,000 | $ 17,000,000 |  |  |  |
Number of hedging instruments designated as fair value hedges | instrument | 0 | 0 |  | 0 |  |
Cumulative effect of accounting changes | $ 908,000,000 | $ 559,000,000 |  | $ 726,000,000 |  | $ 542,000,000
Minimum [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Estimated useful life | 2 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Estimated useful life | 30 years |  |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of accounting changes | $ 3,567,000,000 | 3,150,000,000 |  | 2,797,000,000 |  | $ 2,440,000,000
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of accounting changes |  | 22,000,000 | [1] | (3,000,000) | [2] |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of accounting changes |  | $ 22,000,000 | [1] | $ 36,000,000 | [2] |
[1] | As a result of adopting ASU No. 2016-02, “Leases (ASC 842),” on July 1, 2019, the Company recorded a cumulative effect of initially applying the newguidance as an adjustment to the fiscal year 2020 opening balance of Retained earnings. See Note 1 for more information.
[2] | As a result of adopting ASU No. 2014-09, “Revenue from Contracts with Customers (ASC 606),” on July 1, 2018, the Company recorded a cumulativeeffect of initially applying the new guidance as an adjustment to the fiscal year 2019 opening balance of Retained earnings.

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- Definition Represents the minimum percentage of the greater of the projected benefit obligation or the market-related asset value that actuarial gains and losses must exceed in order to be amortized to pension expense under the corridor approach for purposes of determining the amortization of actuarial gains and losses related to the entity's employee benefits. + References No definition available. + Details
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