Share-Based Compensation (Additional Data Related to Performance Share Unit Activity) (Details) - Performance Share Units $ in Millions	12 Months Ended
	Jun. 30, 2023 USD ($) vestingPeriods	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost, net of estimated forfeitures, related to nonvested performance share units not yet recognized, pre-tax	$ 38	$ 17	$ 26
Weighted-average period over which performance share unit cost is expected to be recognized (in years)	2 years	2 years	2 years
Total fair value of shares vested during the year	$ 23	$ 14	$ 1
Vesting Period in years for Shares | vestingPeriods	3
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target performance goal (as a percent)	0.00%