Stockholders' Equity - Schedule of Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Other comprehensive income, net of tax:
Other comprehensive income, net of tax	$ 42	$ 77	$ 92
Benefit plan adjustments and other
Before tax
Unrealized gains	47	79	100
Reclassifications realized in net income, before tax	8	19	32
Cumulative translation adjustment, before tax		3	(7)
Other comprehensive income	55	101	125
Tax benefit (provision)
Unrealized gains	(11)	(19)	(25)
Reclassifications realized in net income, tax	(2)	(5)	(8)
Cumulative translation adjustment, tax		0	0
Other comprehensive income	(13)	(24)	(33)
Other comprehensive income, net of tax:
Unrealized gains	36	60	75
Reclassifications realized in net income, net of tax	6	14	24
Cumulative translation adjustment, net of tax		3	(7)
Other comprehensive income, net of tax	$ 42	$ 77	$ 92