Additional Financial Information - Schedule of Changes in Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning of year	$ 288	$ 242	$ 213
Acquisitions	0	27	0
Net income (loss)	5	(1)	(1)
Redemption of noncontrolling interests	(208)	0	0
Accretion and redemption value adjustments	1	20	30
End of year	$ 86	$ 288	$ 242