SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2024	Jun. 30, 2024
Accounting Policies [Abstract]
Effective rate for income taxes (as a percent)	9.20%	37.60%	10.10%	36.30%
Basis-point change from the prior-year period (as a percent)	(28.40%)		(26.20%)
Transition tax accrual adjustment	$ 73		$ 73		$ 73
Transition tax, unrecognized tax benefits	73		73		$ 73
Gross unrecognized tax benefits	139		139			$ 65
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate	129		129
Gross interest and penalty accrued	1		2
Total gross accrued interest and penalties related to unrecognized tax benefits	20		20			17
Other assets	1,693		1,693			1,460
Deferred tax assets	$ 1,250		$ 1,250			$ 1,018