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INCOME TAXES (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits at beginning of year $ 47 $ 40 $ 37
Gross increases - tax positions in prior periods 2 2 1
Gross decreases - tax positions in prior periods (20) (1) (6)
Gross increases - current period tax positions 6 8 9
Gross decreases - current period tax positions 0 0 0
Lapse of applicable statute of limitations (3) (2) (1)
Settlements (1) 0 0
Unrecognized tax benefits at end of year $ 31 $ 47 $ 40