Share-Based Compensation (Schedule of Total Share-Based Compensation Expense by Type of Award) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	5 Months Ended	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023	Jan. 30, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense		$ 121	$ 121	$ 96
Restricted Share Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense		$ 71	$ 77	$ 64
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,400	1,400	1,700	2,200
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 86.30	$ 86.30	$ 70.98	$ 57.37
Granted (in shares)		700	900
Granted (in usd per share)		$ 108.72	$ 91.06
Vested (in shares)		(900)	(1,200)
Vested (in usd per share)		$ 72.07	$ 60.47
Canceled and forfeited (in shares)		(100)	(200)
Canceled and forfeited (in usd per share)		$ 94.67	$ 74.40
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense		$ 50	$ 44	$ 32
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,500	1,500	1,300	1,200
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 99.45	$ 99.45	$ 97.03	$ 82.17
Granted (in shares)		500	500
Granted (in usd per share)		$ 113.88	$ 94.66
Vested (in shares)		(300)	(400)
Vested (in usd per share)		$ 108.79	$ 62.26
Canceled and forfeited (in shares)		0	0
Canceled and forfeited (in usd per share)		$ 0	$ 0
GIA Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	220,000	220,000			216,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 1.54	$ 1.54			$ 1.46
Granted (in shares)	61,000
Granted (in usd per share)	$ 1.46
Vested (in shares)	(56,000)
Vested (in usd per share)	$ 1.46
Canceled and forfeited (in shares)	(1,000)
Canceled and forfeited (in usd per share)	$ 1.46
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Number	548,000	548,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Grant Date Fair Value	$ 1.54	$ 1.54