Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Change in accrual for uncertain tax positions, excluding interest and penalties
Balance, beginning of year	$ 30	$ 73	$ 94
Additions for prior year tax positions	1	0	1
Additions for current year tax positions	2	2	2
Reduction for prior year tax positions	(5)	(45)	(24)
Balance, end of year	28	30	73
Reduction for prior year tax positions from the settlement of audits	$ 5	31
Reduction for prior year tax positions from the expiration of statutes of limitations		$ 14	$ 21