RISK MANAGEMENT ACTIVITIES AND FAIR VALUE MEASUREMENTS - AMOUNT OF GAINS AND LOSSES ON OUTSTANDING DERIVATIVES - ADDITIONAL INFORMATION (Details) - Net Investment Hedging - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 138	$ 48
Accumulated Other Comprehensive Income, Gain (Loss)	$ 367	$ 161

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1),(2)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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