SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019
Income Taxes
Effective tax rate (as a percent)	21.30%	20.70%
Gross unrecognized tax benefits	$ 65		$ 67
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate	49
Gross interest and penalty accrued	1
Total gross accrued interest and penalties related to unrecognized tax benefits	$ 12		$ 12

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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