Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Change in accrual for uncertain tax positions, excluding interest and penalties
Balance, beginning of year	$ 28	$ 30	$ 73
Additions for prior year tax positions	2	1	0
Additions for current year tax positions	2	2	2
Reduction for prior year tax positions	(6)	(5)	(45)
Balance, end of year	26	28	30
Reduction for prior year tax positions from the settlement of audits	$ 6		31
Reduction for prior year tax positions from the expiration of statutes of limitations		$ 5	$ 14