| **DEBT (Long-term Debt, Net of Unamortized Discounts or Premiums) (Details) - USD ($)** | Jun. 30, 2020   | May 31, 2020  | Jun. 30, 2019   | Jun. 30, 2018   | May 31, 2018  | Sep. 30, 2017 | Jun. 30, 2017   | Jun. 30, 2016   |
|-----------------------------------------------------------------------------------------|-----------------|---------------|-----------------|-----------------|---------------|---------------|-----------------|-----------------|
| **Debt Instrument [Line Items]**                                                        |            |          |            |            |          |          |            |            |
| Long-term debt                                                                          | $ 2,780,000,000 |          | $ 2,287,000,000 |            |          |          |            |            |
| Less: Current maturities of long-term debt                                              | 0               |          | 0               |            |          |          |            |            |
| Long-term debt, noncurrent                                                              | $ 2,780,000,000 |          | 2,287,000,000   | $ 2,284,000,000 |          |          | $ 1,391,000,000 | $ 1,789,000,000 |
| Senior Long-Term Notes and Debentures; 3.80%, $300 Due November 2021 [Member]           |            |          |            |            |          |          |            |            |
| **Debt Instrument [Line Items]**                                                        |            |          |            |            |          |          |            |            |
| Annual fixed interest rate                                                              | 3.80%           |          |            |            |          |          |            |            |
| Face value                                                                              | $ 300,000,000   |          |            |            |          |          |            |            |
| Long-term debt                                                                          | $ 299,000,000   |          | 299,000,000     |            |          |          |            |            |
| Senior Long-Term Notes and Debentures; 3.05%, $600 Due September 2022 [Member]          |            |          |            |            |          |          |            |            |
| **Debt Instrument [Line Items]**                                                        |            |          |            |            |          |          |            |            |
| Annual fixed interest rate                                                              | 3.05%           |          |            |            |          |          |            |            |
| Face value                                                                              | $ 600,000,000   |          |            |            |          |          |            |            |
| Long-term debt                                                                          | $ 599,000,000   |          | 598,000,000     |            |          |          |            |            |
| Senior Long-Term Notes and Debentures; 3.50%, $500 Due December 2024 [Member]           |            |          |            |            |          |          |            |            |
| **Debt Instrument [Line Items]**                                                        |            |          |            |            |          |          |            |            |
| Annual fixed interest rate                                                              | 3.50%           |          |            |            |          |          |            |            |
| Face value                                                                              | $ 500,000,000   |          |            |            |          |          |            |            |
| Long-term debt                                                                          | $ 498,000,000   |          | 498,000,000     |            |          |          |            |            |
| Senior Long-Term Notes And Debentures; 3.10%, $400 Due October 2027 [Member]            |            |          |            |            |          |          |            |            |
| **Debt Instrument [Line Items]**                                                        |            |          |            |            |          |          |            |            |
| Annual fixed interest rate                                                              | 3.10%           |          |            |            |          | 3.10%         |            |            |
| Face value                                                                              | $ 400,000,000   |          |            |            |          | $ 400,000,000 |            |            |
| Long-term debt                                                                          | $ 397,000,000   |          | 397,000,000     |            |          |          |            |            |
| Senior Long-Term Notes And Debentures; 3.90%, $500 Due May 2028 [Member]                |            |          |            |            |          |          |            |            |
| **Debt Instrument [Line Items]**                                                        |            |          |            |            |          |          |            |            |
| Annual fixed interest rate                                                              | 3.90%           |          |            |            | 3.90%         |          |            |            |
| Face value                                                                              | $ 500,000,000   |          |            |            | $ 500,000,000 |          |            |            |
| Long-term debt                                                                          | $ 496,000,000   |          | 495,000,000     |            |          |          |            |            |
| Senior Long-Term Notes And Debentures; 1.80%, $500 Due May 2030                         |            |          |            |            |          |          |            |            |
| **Debt Instrument [Line Items]**                                                        |            |          |            |            |          |          |            |            |
| Annual fixed interest rate                                                              | 1.80%           | 1.80%         |            |            |          |          |            |            |
| Face value                                                                              | $ 500,000,000   | $ 500,000,000 |            |            |          |          |            |            |
| Long-term debt                                                                          | $ 491,000,000   |          | $ 0             |            |          |          |            |            |

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Face (par) amount of debt instrument at time of issuance.
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| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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