PENSION, DEFERRED COMPENSATION AND POST-RETIREMENT BENEFIT PLANS - Fair values of the Company's pension and post-retirement plan assets by asset category (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 1,433	$ 1,366
Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	342	150
Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	692	874
Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	49	48
Assets Measured at NAV
Defined Benefit Plan Disclosure
Fair value of plan assets	350	294
Cash and cash equivalents
Defined Benefit Plan Disclosure
Fair value of plan assets	29	3
Cash and cash equivalents \| Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	29	3
Short-term investment funds
Defined Benefit Plan Disclosure
Fair value of plan assets	12	23
Short-term investment funds \| Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	6	17
Short-term investment funds \| Assets Measured at NAV
Defined Benefit Plan Disclosure
Fair value of plan assets	6	6
Government and agency securities
Defined Benefit Plan Disclosure
Fair value of plan assets	81	37
Government and agency securities \| Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	81	37
Debt instruments
Defined Benefit Plan Disclosure
Fair value of plan assets	25	59
Debt instruments \| Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	25	59
Commingled funds
Defined Benefit Plan Disclosure
Fair value of plan assets	1,112	1,102
Unfunded commitments	$ 0
Commingled funds \| Minimum
Defined Benefit Plan Disclosure
Monthly and quarterly redemption notice periods	10 days
Commingled funds \| Maximum
Defined Benefit Plan Disclosure
Monthly and quarterly redemption notice periods	30 days
Commingled funds \| Level 1
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 313	147
Commingled funds \| Level 2
Defined Benefit Plan Disclosure
Fair value of plan assets	580	761
Commingled funds \| Assets Measured at NAV
Defined Benefit Plan Disclosure
Fair value of plan assets	219	194
Insurance contracts
Defined Benefit Plan Disclosure
Fair value of plan assets	49	48
Insurance contracts \| Level 3
Defined Benefit Plan Disclosure
Fair value of plan assets	49	48
Limited partnerships and hedge fund investments
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 125	94
Limited partnerships and hedge fund investments \| Minimum
Defined Benefit Plan Disclosure
Monthly and quarterly redemption notice periods	30 days
Limited partnerships and hedge fund investments \| Maximum
Defined Benefit Plan Disclosure
Monthly and quarterly redemption notice periods	90 days
Limited partnerships and hedge fund investments \| Assets Measured at NAV
Defined Benefit Plan Disclosure
Fair value of plan assets	$ 125	$ 94

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+ References

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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 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258

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