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EMPLOYEE BENEFIT PLANS (Retirement Income Plan's Assets Carried at Fair Value) (Details) - Retirement Income Plans [Member] - Other Postretirement Benefit Plan [Member] - USD ($) $ in Millions | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 434 | $ 423 | $ 409
Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value, excluding net asset value investments | 2 | 2 |
Common collective trusts measured at net asset value | 432 | 421 |
Total assets at fair value | 434 | 423 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value, excluding net asset value investments | 2 | 2 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value, excluding net asset value investments | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 2 | 2 |
Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 2 | 2 |
Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Bond Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Common collective trusts measured at net asset value | 310 | 307 |
Fair Value, Measurements, Recurring [Member] | International Equity Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Common collective trusts measured at net asset value | 64 | 56 |
Fair Value, Measurements, Recurring [Member] | Domestic Equity Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Common collective trusts measured at net asset value | 46 | 44 |
Fair Value, Measurements, Recurring [Member] | Real Estate Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Common collective trusts measured at net asset value | $ 12 | $ 14 |

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- Definition Defined Benefit Plan, Fair Value of Plan Assets, Excluding Net Asset Value Investments + References No definition available. + Details
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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. + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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