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EQUITY INCOME (LOSS) OF AFFILIATES - Additional Information (Details) $ / shares in Units, $ in Millions	Jul. 12, 2019	Jun. 30, 2019 USD ($) $ / shares	Mar. 31, 2019 $ / shares	Jun. 30, 2018
Ownership interests
Conversion price (in dollars per share)		$ 3.00
Pueblo Viejo Mine [Member]
Ownership interests
Equity interest ownership (as a percent)		40.00%
Norte Abierto Project [Member]
Ownership interests
Equity interest ownership (as a percent)		50.00%
Deferred payment \| $		$ 153
Nueva Union Project [Member]
Ownership interests
Equity interest ownership (as a percent)		50.00%
Alumbrera Mine [Member]
Ownership interests
Equity interest ownership (as a percent)		37.50%
Alumbrera Mine [Member] \| Plan
Ownership interests
Equity interest ownership (as a percent)			18.75%
Continental
Ownership interests
Equity interest ownership (as a percent)	19.90%	19.70%
Conversion price (in dollars per share)			$ 3.00
Minera La Zanja S.R.L.
Ownership interests
Equity interest ownership (as a percent)		46.90%
TMAC
Ownership interests
Equity interest ownership (as a percent)		28.50%
Maverix [Member]
Ownership interests
Equity interest ownership (as a percent)		27.80%		27.98%