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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits [Roll Forward] |  |  |
Beginning of the year balance of gross unrecognized tax benefits | $ 70 | $ 67 | $ 60
Gross amounts of increases as a result of tax positions taken during a prior period | 9 | 11 | 12
Gross amounts of decreases as a result of tax positions taken during a prior period | (10) | (9) | (6)
Gross amounts of increases as a result of tax positions taken during the current period | 8 | 7 | 9
Amounts of decreases in unrecognized tax benefits relating to settlements with taxing authorities | (13) | (4) | (7)
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statutes of limitations | (2) | (2) | (1)
End of year balance of gross unrecognized tax benefits | $ 62 | $ 70 | $ 67

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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