SHARE-BASED COMPENSATION PLANS - Nonvested Nonqualified Stock Options (Details) - $ / shares shares in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Number of Shares
Non-vested, beginning balance (in shares)	26.8
Granted (in shares)	2.2	19.4	5.9
Forfeited (in shares)	(11.8)
Non-vested, ending balance (in shares)	17.2	26.8
Weighted Average Grant Date Fair Value
Non-vested, beginning balance (in dollars per share)	$ 3.72
Granted (in dollars per share)	3.41	$ 2.87	$ 4.87
Forfeited (in dollars per share)	3.64
Non-vested, ending balance (in dollars per share)	$ 3.73	$ 3.72