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Share-Based Compensation (Narrative) (Details) shares in Thousands, $ in Millions	12 Months Ended
	Jun. 30, 2024 USD ($) grantees shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Payment Arrangement, Plan Modification, Number of Grantees Affected \| grantees	4
Total share-based compensation expense	$ 121	$ 96	$ 81
Tax benefit related to share-based compensation	16	12	12
Total expense on employee retirement savings plans	65	66	60
Share-Based Payment Arrangement, Plan Modification, Incremental Cost	9
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 44	$ 32	$ 12
Performance Share Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target performance goal (as a percent)	240.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) \| shares	0	0	0
2021 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant \| shares	18,000
2021 LTIP [Member] \| Awards Other than Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant \| shares	7,000
2021 LTIP [Member] \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant \| shares	18,000