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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Income Taxes
Effective tax rate (as a percent)	30.80%	22.90%	26.20%	21.90%
Gross unrecognized tax benefits	$ 67		$ 67		$ 67
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate	50		50
Gross interest and penalty accrued	1		2
Total gross accrued interest and penalties related to unrecognized tax benefits	$ 12		$ 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 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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