Stockholders' Equity - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Other comprehensive income, net of tax:
Other comprehensive income, net of tax	$ 77	$ 92	$ 99
Benefit plan, cumulative translation adjustments and other
Before tax
Unrealized gains	79	100	87
Reclassifications realized in net income, before tax	19	32	45
Cumulative translation adjustment, before tax	3	(7)
Other comprehensive income	101	125	132
Tax benefit (provision)
Unrealized gains	(19)	(25)	(21)
Reclassifications realized in net income, tax	(5)	(8)	(12)
Cumulative translation adjustment, tax	0	0
Other comprehensive income	(24)	(33)	(33)
Other comprehensive income, net of tax:
Unrealized gains	60	75	66
Reclassifications realized in net income, net of tax	14	24	33
Cumulative translation adjustment, net of tax	3	(7)
Other comprehensive income, net of tax	$ 77	$ 92	$ 99