Income Taxes (Uncertain Tax Positions) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020		Jun. 30, 2019
Change in accrual for uncertain tax positions, excluding interest and penalties
Balance, beginning of year	$ 73	$ 94		$ 91
Additions for prior year tax positions		1		7
Additions for current year tax positions	2	2		9
Reduction for prior year tax positions	(45)	(24)	[1]	(13)
Balance, end of year	$ 30	$ 73		$ 94

[1] The reduction for prior year tax positions in fiscal 2021 includes $31 million from the settlement of audits and $14 million from the expiration of statutes of limitations. The reduction for prior year tax positions in fiscal 2020 includes $21 million from the expiration of statutes of limitations.