SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024
Accounting Policies [Abstract]
Effective rate for income taxes (as a percent)	13.30%	21.70%
Basis-point change from the prior-year period (as a percent)	8.40%
Transition tax accrual adjustment	$ 73
Transition tax, unrecognized tax benefits	73
Gross unrecognized tax benefits	138		$ 65
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate	128
Gross interest and penalty accrued	2
Total gross accrued interest and penalties related to unrecognized tax benefits	19		17
Other assets	1,527		1,460
Deferred tax assets	$ 1,107		$ 1,018